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Articles 25771 - 25800 of 302620

Full-Text Articles in Physical Sciences and Mathematics

Establishment Of Invasive Black Carp (Mylopharyngodon Piceus) In The Mississippi River Basin: Identifying Sources And Year Classes Contributing To Recruitment, Gregory W. Whitledge, Patrick T. Kroboth, Duane C. Chapman, Quinton E. Phelps, Wes Sleeper, Jennifer Bailey, Jill A. Jenkins Sep 2022

Establishment Of Invasive Black Carp (Mylopharyngodon Piceus) In The Mississippi River Basin: Identifying Sources And Year Classes Contributing To Recruitment, Gregory W. Whitledge, Patrick T. Kroboth, Duane C. Chapman, Quinton E. Phelps, Wes Sleeper, Jennifer Bailey, Jill A. Jenkins

United States Geological Survey: Staff Publications

Black Carp (Mylopharyngodon piceus) was imported to the USA to control aquaculture pond snails. This species has escaped captivity and occurs in parts of the Mississippi River, several tributaries, and floodplain lakes, which is concerning due to potential competition with native fishes and predation on native mussels, many of which are imperiled. However, Black Carp captures have primarily been incidental by commercial fishers, and evidence of reproduction in the wild is limited. The objectives of this study were to assess relative abundance of aquaculture- origin and wild Black Carp using ploidy and otolith stable isotope analysis, identify spatial …

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Saturable Absorption Of Free-Electron Laser Radiation By Graphite Near The Carbon K-Edge, Lars Hoffmann, Sasawat Jamnuch, Craig P. Schwartz, Tobias Helk, Sumana L. Raj, Hikaru Mizuno, Riccardo Mincigrucci, Laura Foglia, Emiliano Principi, Shervin Fatehi Sep 2022

Saturable Absorption Of Free-Electron Laser Radiation By Graphite Near The Carbon K-Edge, Lars Hoffmann, Sasawat Jamnuch, Craig P. Schwartz, Tobias Helk, Sumana L. Raj, Hikaru Mizuno, Riccardo Mincigrucci, Laura Foglia, Emiliano Principi, Shervin Fatehi

Chemistry Faculty Publications and Presentations

The interaction of intense light with matter gives rise to competing nonlinear responses that can dynamically change material properties. Prominent examples are saturable absorption (SA) and two-photon absorption (TPA), which dynamically increase and decrease the transmission of a sample depending on pulse intensity, respectively. The availability of intense soft X-ray pulses from free-electron lasers (FELs) has led to observations of SA and TPA in separate experiments, leaving open questions about the possible interplay between and relative strength of the two phenomena. Here, we systematically study both phenomena in one experiment by exposing graphite films to soft X-ray FEL pulses of …

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Very High Middle Miocene Surface Productivity On The U.S. Mid-Atlantic Shelf Amid Glacioeustatic Sea Level Variability, Marci M. Robinson, Harry J. Dowsett, Timothy D. Herbert Sep 2022

Very High Middle Miocene Surface Productivity On The U.S. Mid-Atlantic Shelf Amid Glacioeustatic Sea Level Variability, Marci M. Robinson, Harry J. Dowsett, Timothy D. Herbert

United States Geological Survey: Staff Publications

The Miocene Climatic Optimum (MCO) provides important insights into how the climate system operates under elevated temperatures and atmospheric CO2 levels. Few western North Atlantic paleotemperature or paleoecological records exist from the MCO, despite their importance for understanding both regional and global climate dynamics. Here we present quantitative MCO paleoecological data from the western North Atlantic, specifically from the Baltimore Gas & Electric (BG&E) marine sediment core from southern Maryland, USA. We examine alkenones and planktic foraminifera and document the first sea surface temperature (SST) and productivity estimates for the MCO and the Middle Miocene Climate Transition (MMCT) from …

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Discovering Hidden Geothermal Signatures Using Non-Negative Matrix Factorization With Customized K-Means Clustering, V. V. Vesselinov, B. Ahmmed, M. K. Mudunuru, J. D. Pepin, E. R. Burns, D. L. Siler, S. Karra, R. S. Middleton Sep 2022

Discovering Hidden Geothermal Signatures Using Non-Negative Matrix Factorization With Customized K-Means Clustering, V. V. Vesselinov, B. Ahmmed, M. K. Mudunuru, J. D. Pepin, E. R. Burns, D. L. Siler, S. Karra, R. S. Middleton

United States Geological Survey: Staff Publications

Discovery of hidden geothermal resources is challenging. It requires the mining of large datasets with diverse data attributes representing subsurface hydrogeological and geothermal conditions. The commonly used play fairway analysis approach typically incorporates subject-matter expertise to analyze regional data to estimate geothermal characteristics and favorability. We demonstrate an alternative approach based on machine learning (ML) to process a geothermal dataset from southwest New Mexico (SWNM). The study region includes low- and medium-temperature hydrothermal systems. Several of these systems are not well characterized because of insufficient existing data and limited past explorative work. This study discovers hidden patterns and relations in …

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Maximum Spatial Perturbation Consistency For Unpaired Image-To-Image Translation, Yanwu Xu, Shaoan Xie, Wenhao Wu, Kun Zhang, Mingming Gong, Kayhan Batmanghelich Sep 2022

Maximum Spatial Perturbation Consistency For Unpaired Image-To-Image Translation, Yanwu Xu, Shaoan Xie, Wenhao Wu, Kun Zhang, Mingming Gong, Kayhan Batmanghelich

Machine Learning Faculty Publications

Unpaired image-to-image translation (I2I) is an ill-posed problem, as an infinite number of translation functions can map the source domain distribution to the target distribution. Therefore, much effort has been put into designing suitable constraints, e.g., cycle consistency (CycleGAN), geometry consistency (GCGAN), and contrastive learning-based constraints (CUTGAN), that help better pose the problem. However, these well-known constraints have limitations: (1) they are either too restrictive or too weak for specific I2I tasks; (2) these methods result in content distortion when there is a significant spatial variation between the source and target domains. This paper proposes a universal regularization technique called …

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Orthogonal Point Location And Rectangle Stabbing Queries In 3-D, Timothy M. Chan, Yakov Nekrich, Saladi Rahul, Konstantinos Tsakalidis Sep 2022

Orthogonal Point Location And Rectangle Stabbing Queries In 3-D, Timothy M. Chan, Yakov Nekrich, Saladi Rahul, Konstantinos Tsakalidis

Michigan Tech Publications

In this work, we present a collection of new results on two fundamental problems in geometric data structures: orthogonal point location and rectangle stabbing.• Orthogonal point location. We give the first linear-space data structure that sup- ports 3-d point location queries on n disjoint axis-aligned boxes with optimal O (log") query time in the (arithmetic) pointer machine model. This improves the previous 0 (\ogi/2 n^ bound of Rahul \SODA 201o|. We similarly obtain the first linear-space data structure in the I/O model with optimal query cost, and also the first linear-space data structure in the word HAM model with sub-logarithmic …

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Ubnormal: New Benchmark For Supervised Open-Set Video Anomaly Detection, Andra Acsintoae, Andrei Florescu, Mariana-Iuliana Georgescu, Tudor Mare, Paul Sumedrea, Radu Tudor Ionescu, Fahad Shahbaz Khan, Mubarak Shah Sep 2022

Ubnormal: New Benchmark For Supervised Open-Set Video Anomaly Detection, Andra Acsintoae, Andrei Florescu, Mariana-Iuliana Georgescu, Tudor Mare, Paul Sumedrea, Radu Tudor Ionescu, Fahad Shahbaz Khan, Mubarak Shah

Computer Vision Faculty Publications

Detecting abnormal events in video is commonly framed as a one-class classification task, where training videos contain only normal events, while test videos encompass both normal and abnormal events. In this scenario, anomaly detection is an open-set problem. However, some studies assimilate anomaly detection to action recognition. This is a closed-set scenario that fails to test the capability of systems at detecting new anomaly types. To this end, we propose UBnormal, a new supervised open-set benchmark composed of multiple virtual scenes for video anomaly detection. Unlike existing data sets, we introduce abnormal events annotated at the pixel level at training …

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Odu’S Storm Recovery Project Gets Boost From Dominion Energy, News @ Odu Sep 2022

Odu’S Storm Recovery Project Gets Boost From Dominion Energy, News @ Odu

News Items

No abstract provided.

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Pstr: End-To-End One-Step Person Search With Transformers, Jiale Cao, Pang Yanwei, Rao Anwer, Hisham Cholakkal, Jin Xie, Mubarak Shah, Fahad Shahbaz Khan Sep 2022

Pstr: End-To-End One-Step Person Search With Transformers, Jiale Cao, Pang Yanwei, Rao Anwer, Hisham Cholakkal, Jin Xie, Mubarak Shah, Fahad Shahbaz Khan

Computer Vision Faculty Publications

We propose a novel one-step transformer-based person search framework, PSTR, that jointly performs person detection and re-identification (re-id) in a single architecture. PSTR comprises a person search-specialized (PSS) module that contains a detection encoder-decoder for person detection along with a discriminative re-id decoder for person re-id. The discriminative re-id decoder utilizes a multi-level supervision scheme with a shared decoder for discriminative re-id feature learning and also comprises a part attention block to encode relationship between different parts of a person. We further introduce a simple multi-scale scheme to support re-id across person instances at different scales. PSTR jointly achieves the …

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Characterization Of Superconducting Hardware For Implementing Quantum Stabilizers, Kenneth Richard Dodge Sep 2022

Characterization Of Superconducting Hardware For Implementing Quantum Stabilizers, Kenneth Richard Dodge

Dissertations - ALL

Superconducting qubits are one of the leading approaches being investigated for building a scalable quantum computer. In the presence of external noise and perturbations plus local microscopic fluctuations and dissipation in the qubit environment, arbitrary quantum states will decohere, leading to bit-flip and phase-flip errors of the qubit. In order to build a fault-tolerant quantum computer that can preserve and process quantum information in the presence of noise and dissipation, one must implement some form of quantum error correction. Stabilizer operations are at the heart of quantum error correction and are typically implemented in software-controlled entangling gates and measurements of …

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Mgrre_Thinsections_05_A_32, Mgrre Sep 2022

Mgrre_Thinsections_05_A_32, Mgrre

Thin Sections

No abstract provided.

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Multi-Omics Responses In Tree Swallow (Tachycineta Bicolor) Nestlings From The Maumee Area Of Concern, Maumee River, Ohio, Chi Yen Tseng, Christine M. Custer, Thomas W. Custer, Paul M. Dummer, Natalie Karouna-Renier, Cole W. Matson Sep 2022

Multi-Omics Responses In Tree Swallow (Tachycineta Bicolor) Nestlings From The Maumee Area Of Concern, Maumee River, Ohio, Chi Yen Tseng, Christine M. Custer, Thomas W. Custer, Paul M. Dummer, Natalie Karouna-Renier, Cole W. Matson

United States Geological Survey: Staff Publications

A multi-omics approach was utilized to identify altered biological responses and functions, and to prioritize contaminants to assess the risks of chemical mixtures in the Maumee Area of Concern (AOC), Maumee River, OH, USA. The Maumee AOC is designated by the United States Environmental Protection Agency as having significant beneficial use impairments, including degradation of fish and wildlife populations, bird or animal deformities or reproduction problems, and loss of fish and wildlife habitat. Tree swallow (Tachycineta bicolor) nestlings were collected at five sites along the Maumee River, which included wastewater treatment plants (WWTPs) and industrial land-use sites. Polychlorinated …

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Spontaneous Polarization In An Ultrathin Improper-Ferroelectric/Dielectric Bilayer In A Capacitor Structure At Cryogenic Temperatures, Yu Yun, Pratyush Buragohain, Arashdeep Singh Thind, Yuewei Yin, Xin Li, Xuanyuan Jiang, Rohan Mishra, Alexei Gruverman, X. S. Xu Sep 2022

Spontaneous Polarization In An Ultrathin Improper-Ferroelectric/Dielectric Bilayer In A Capacitor Structure At Cryogenic Temperatures, Yu Yun, Pratyush Buragohain, Arashdeep Singh Thind, Yuewei Yin, Xin Li, Xuanyuan Jiang, Rohan Mishra, Alexei Gruverman, X. S. Xu

Department of Physics and Astronomy: Faculty Publications

To determine the effect of depolarization and the critical thickness in improper-ferroelectric hexagonal-ferrite thin films, we investigate the polarization switching of a ferroelectric/dielectric bilayer in capacitor structures at 20 K. Experimentally, we show that the spontaneous polarization persists throughout the studied thickness range (3 to 80 unit cell), even with a thick (10-nm) dielectric layer, suggesting no practical thickness limit for applications. By fitting the effect of depolarization using the phenomenological theory, we show that the spontaneous polarization remains finite when the thickness of the ferroelectric layer approaches zero, providing a hint for the absence of critical thickness. We also …

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Short Warm-Side Wet-Bulb Temperature Distribution Tails Lead To Accelerated Increases In Extreme Threshold Exceedances Under Global Warming, Yianna Sotirios Bekris Sep 2022

Short Warm-Side Wet-Bulb Temperature Distribution Tails Lead To Accelerated Increases In Extreme Threshold Exceedances Under Global Warming, Yianna Sotirios Bekris

Dissertations and Theses

Humid-heat extremes threaten human health and are increasing in frequency with global warming, so elucidating factors affecting their rate of change is critical. This thesis examines the role of historical (1985-2014) wet-bulb temperature distribution tail shape on the probability of wet-bulb temperature extreme threshold exceedances under 2°Celsius global warming. Analysis of global climate models and reanalysis reveals that non-Gaussian wet-bulb temperature distribution tails are common worldwide across extensive, spatially coherent regions. More rapid increases in the number of days exceeding the historical 95th percentile are projected in locations with shorter-than-Gaussian warm-side tails. Of the two primary components of wet-bulb temperature, …

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Mgrre_Thinsections_05_A_31, Mgrre Sep 2022

Mgrre_Thinsections_05_A_31, Mgrre

Thin Sections

No abstract provided.

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Exploration Of Integrated Technology For Deep Coalbed Methane Drainage In Full Life Cycle: A Case Study Of Daning‒Jixian Block, Zeng Wenting, Ge Tengze, Wang Qian, Pang Bin, Liu Yinhua, Zhang Kang, Yu Lizhu Sep 2022

Exploration Of Integrated Technology For Deep Coalbed Methane Drainage In Full Life Cycle: A Case Study Of Daning‒Jixian Block, Zeng Wenting, Ge Tengze, Wang Qian, Pang Bin, Liu Yinhua, Zhang Kang, Yu Lizhu

Coal Geology & Exploration

The first deep coalbed methane (CBM) field with a depth of more than 2 000 meters in China has been proven in Daning‒Jixian Block on the eastern margin of Ordos Basin, where the deep coal bed has the characteristics of large buried depth, high pressure, high gas content, high gas saturation and low permeability. Besides, the features of early gas occurrence, high gas-liquid ratio and high salinity of produced liquid are shown in the production process. Problems such as corrosion, anti-eccentric wearing, gas locking and pump blocking were encountered in the application of suction pump based lifting system in the …

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Lithofacies And Sedimentary Environment Evolution Of The Shan2 3 Sub-Member Transitional Shale Of The Shanxi Formation In The Daning-Jixian Area, Eastern Ordos Basin, Sun Yue, Jiang Yuqiang, Xiong Xianyue, Li Xingtao, Li Shuxin, Qiu Zhen, Sun Xiongwei Sep 2022

Lithofacies And Sedimentary Environment Evolution Of The Shan2 3 Sub-Member Transitional Shale Of The Shanxi Formation In The Daning-Jixian Area, Eastern Ordos Basin, Sun Yue, Jiang Yuqiang, Xiong Xianyue, Li Xingtao, Li Shuxin, Qiu Zhen, Sun Xiongwei

Coal Geology & Exploration

The Shan2 3 Sub-member transitional facies shale of the Permian Shanxi Formation in the eastern margin of the Ordos Basin is a crucial target for future unconventional oil and gas exploration. Based on field outcrop observation, core description and thin-section identification, combined with X-ray diffraction, trace elements test and other analyses, four types of shale lithofacies were identified, including siliceous, siliceous-argillaceous, calcareous-siliceous (or siliceous-calcareous) and argillaceous lithofacies. The petrological characteristics and geochemical indicators show that the depositional environment of the Shan2 3 Sub-member inherited the epicontinental sea pattern with relatively gentle topography of the late Taiyuan Epoch. The …

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Geosteering Technology And Application In Horizontal Wells For Coal Measure Tight Gas Reservoirs In The Areas Of Low Exploration Degree：Taking Dj-P37 Bore Field As An Example, Zhang Wen, Zhang Lei, Huang Li, Li Xiaogang, Shi Shi, Sun Xuedong, Zhao Longmei, Dai Ruirui, Tong Jiangnan Sep 2022

Geosteering Technology And Application In Horizontal Wells For Coal Measure Tight Gas Reservoirs In The Areas Of Low Exploration Degree：Taking Dj-P37 Bore Field As An Example, Zhang Wen, Zhang Lei, Huang Li, Li Xiaogang, Shi Shi, Sun Xuedong, Zhao Longmei, Dai Ruirui, Tong Jiangnan

Coal Geology & Exploration

In the 2D seismic area, the reservoir with a low well control degree, frontal sedimentary of the meandering river's delta and other complex lithology reservoirs, the drilling ratio of reservoirs is low when horizontal wells are implemented. The application of the geosteering technology combining the iterative updating of 3D geologic models and geologic-engineering integration has been gradually extensive. Multiple tight sandstone reservoirs, such as the Beichagou sandstone in the Shan2 3 Submember of the Shanxi Formation, develop in the Neopaleozoic coal measure at the southeastern margin of the Ordos Basin. Among them, the DJ-P37 bore field of the Daning–Jixian …

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Analysis On Influencing Factors Of Single/Multi-Layer Development Of Coalbed Methane Field: A Case Study Of Baode Block, Zhang Lei, Xu Fengyin, Li Ziling, Zhang Wei, Hou Wei, Zhang Qingfeng, Zhang Wen, Fan Hongbo, Li Yongchen Sep 2022

Analysis On Influencing Factors Of Single/Multi-Layer Development Of Coalbed Methane Field: A Case Study Of Baode Block, Zhang Lei, Xu Fengyin, Li Ziling, Zhang Wei, Hou Wei, Zhang Qingfeng, Zhang Wen, Fan Hongbo, Li Yongchen

Coal Geology & Exploration

Baode Block in the eastern margin of Ordos Basin is the first coalbed methane field of middle-low rank coal with 500 million cubic meters of production capacity constructed and reached in China, and it is also a benchmark in the coalbed methane industry there. During the development of Baode Block, good results are obtained by the commingled development of two sets of main coal layers, which are better than that of single-layer development. However, poor development result is obtained locally in the commingled development of some wells under the same development conditions, which is poorer than that of single-layer development. …

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Formation Pressure Calculation Of Tight Sandstone Gas Reservoir Based On Material Balance Inversion Method, Wu Nan, Shi Shi, Zheng Shiqi, Zhao Haoyang, Wang Hongya, Tong Jiangnan Sep 2022

Formation Pressure Calculation Of Tight Sandstone Gas Reservoir Based On Material Balance Inversion Method, Wu Nan, Shi Shi, Zheng Shiqi, Zhao Haoyang, Wang Hongya, Tong Jiangnan

Coal Geology & Exploration

Pressure is the soul of a gas reservoir. Formation pressure is the basis of evaluating gas well productivity and analyzing gas reservoir potential. However, due to data integrity and method applicability limitations, formation pressure in most gas wells cannot be accurately obtained. On the basis of a small amount of pressure monitoring data, the material balance inversion method is proposed by using mathematical inversion thought to evaluate the formation pressure of tight sandstone gas reservoirs. Firstly, the dynamic reserves of gas wells are calculated by fitting the Blasingame chart with the production data of gas wells under pseudo-steady flow. Secondly, …

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Key Technology And Engineering Demonstration For Cascade Utilization Of Gas In Key Coal Mining Areas Of Shanxi Province, China, Li Guofu, Li Chao, Huo Chunxiu, Yan Zhiming, Zhang Diankun, Wang Chaoshuai, Wang Zheng Sep 2022

Key Technology And Engineering Demonstration For Cascade Utilization Of Gas In Key Coal Mining Areas Of Shanxi Province, China, Li Guofu, Li Chao, Huo Chunxiu, Yan Zhiming, Zhang Diankun, Wang Chaoshuai, Wang Zheng

Coal Geology & Exploration

The key coal mining areas of Shanxi Province, including Jincheng, Yangquan, Xishan, Fenxi and Lu’an, are the main implementation sites of the “13th Five-Year” national science and technology major project “Demonstration Project of Coordinated Development of Coalbed Methane and Coal in Key Coal Mining Areas of Shanxi”. Relying on the high-end platform of the national science and technology major project, a series of technologies for cascade utilization of coal mine gas have been developed and demonstrated to guide the enhancement of gas drainage and utilization from 6.02 billion m3 and 2.23 billion m3 in 2015 to 6.403 billion …

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Practice And Understanding Of Coalbed Methane Co-Production In Zhijin Area, Guizhou, Li Jiaxin, Chen Zhenlong, Guo Tao Sep 2022

Practice And Understanding Of Coalbed Methane Co-Production In Zhijin Area, Guizhou, Li Jiaxin, Chen Zhenlong, Guo Tao

Coal Geology & Exploration

Guizhou Province is a typical area where thin-to-medium thick coalbeds are developed, where the resource endowment characteristics, including multiple coalbeds, small thickness, low permeability, high in-situ stress and multi-layer superposition of pressure system, lead to the difficulties in localization of the mainstream technologies at home and abroad for the development of coalbed methane (CBM) and the utilization of CBM resources. The particularity of these geological characteristics of the multiple and thin CBM determines the obvious selectivity of technologies for its development, and thus the co-production of multiple coalbeds becomes the essential method for effective development and utilization of CBM resources …

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Typical Coalbed Methane (Cbm) Enrichment And Production Modes Under The Control Of Regional Structure And Evolution, Ju Yiwen, Qiao Peng, Wei Mingming, Li Xin, Xu Fengyin, Feng Guorui, Li Yong, Wu Caifang, Cao Yunxing, Li Guofu, Han Yuming, Li Zhen, Lu Zhigang, Jiang Lei Sep 2022

Typical Coalbed Methane (Cbm) Enrichment And Production Modes Under The Control Of Regional Structure And Evolution, Ju Yiwen, Qiao Peng, Wei Mingming, Li Xin, Xu Fengyin, Feng Guorui, Li Yong, Wu Caifang, Cao Yunxing, Li Guofu, Han Yuming, Li Zhen, Lu Zhigang, Jiang Lei

Coal Geology & Exploration

Coalbed methane (CBM) exploration and development is of great significance to optimize China’s energy structure and cope with coal mine disasters and ecological environment problems. In this paper, combined with regional structure and evolution and CBM geological conditions, the enrichment and recovery modes of CBM are innovatively divided into four categories: simple structural fracture system, fold system (shallower synclinal shaft, fold limb, secondary structural high position), thrust system (fault-thrust-fold belt, high-steep thrust structure) and structural superposition system. Among them, simple structural fracture system mode is often encountered in the areas with relatively stable structure, where the CBM is mainly derived …

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Optimum Selection Of Favorable Areas For Multi-Layer Cbm Mining And Reservoir Characterstics In North Yunnan And Guizhou Exploration Area, Sun Bin, Tian Wenguang, Yang Zhaobiao, Yang Minfang, Li Cunlei Sep 2022

Optimum Selection Of Favorable Areas For Multi-Layer Cbm Mining And Reservoir Characterstics In North Yunnan And Guizhou Exploration Area, Sun Bin, Tian Wenguang, Yang Zhaobiao, Yang Minfang, Li Cunlei

Coal Geology & Exploration

Due to the abundance of coal-bearing synclines, multiple seams and high gas content, the exploration area in North Yunnan and Guizhou Provinces is an important expansion block in the periphery of Junlian County. Based on a large number of coalfield holes and test wells, the geological conditions of CBM are analyzed, and the optimization and evaluation method of multi-layer favorable area is established, i.e. multi-level fuzzy mathematics plus key indicators. Firstly, the evaluation model is constructed based on hierarchical optimization, and the key indicators are determined as co-mining coefficient, coal structure and gas content. The co-mining coefficient is composed of …

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Construction Concept Of Integrated Geological Engineering Platform For Coalbed Methane, Li Guihong, Zhao Peipei, Wu Xinbo Sep 2022

Construction Concept Of Integrated Geological Engineering Platform For Coalbed Methane, Li Guihong, Zhao Peipei, Wu Xinbo

Coal Geology & Exploration

The production of coalbed methane (CBM) wells in China is generally low, and the CBM geological research is seriously divorced from the engineering, so it is urgent to introduce the idea of geological engineering integration, which is helpful to form a scientific engineering decision. In this paper, the idea of constructing a CBM geological engineering integration platform is proposed, and its business framework and function framework are built. Various professional software tools are integrated, such as Petrel for geological modeling, compass for drilling and completion design, MFrac for fracturing design, and CBM-SIM for reservoir numerical simulation. An integrated shared database …

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Acid Fracturing Technology Of Deep Cbm Wells And Its Field Test In Daning-Jixian Block, Liu Changsong, Zhao Haifeng, Chen Shuai, Zhen Huaibin, Wang Chengwang Sep 2022

Acid Fracturing Technology Of Deep Cbm Wells And Its Field Test In Daning-Jixian Block, Liu Changsong, Zhao Haifeng, Chen Shuai, Zhen Huaibin, Wang Chengwang

Coal Geology & Exploration

There are abundant deep coalbed methane resources in China, but the coupling problem of coal reservoir reconstruction technology and deep geological quality conditions needs to be solved urgently. With Daning-Jixian Block as the geological background, the feasibility of volumetric fracturing is evaluated from the perspective of rock mechanical parameters of the No.8 coal seam in a deep layer of the block, and verified by the indoor triaxial acid fracturing model experiment, in order to explore the coal reservoir reconstruction technology under deep geological conditions. Based on the above basic research, the volume acid fracturing technology characterized by high displacement, low …

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Table Of Contents, The Editors Sep 2022

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Coal Measures Superimposed Gas Reservoir And Its Exploration And Development Technology Modes, Sang Shuxun, Zheng Sijian, Yi Tongsheng, Zhao Fuping, Han Sijie, Jia Jinlong, Zhou Xiaozhi Sep 2022

Coal Measures Superimposed Gas Reservoir And Its Exploration And Development Technology Modes, Sang Shuxun, Zheng Sijian, Yi Tongsheng, Zhao Fuping, Han Sijie, Jia Jinlong, Zhou Xiaozhi

Coal Geology & Exploration

Coal measures superimposed gas reservoir is a key reservoir type of coal-measure gas in coal bearing formation. The discovery, exploration and development practice of coal measures superimposed gas reservoirs in China have opened up a new chapter for the coal-measure gas exploration. In this study, the concept, main types, development characteristics and occurrence distribution of coal measures superimposed gas reservoir are proposed and expounded. The formation prerequisite, accumulation process and reservoir forming mechanism of coal measure superimposed gas reservoir are analyzed. Specifically, the geological suitability exploration and development technology modes of two typical coal measures superimposed gas reservoirs are emphatically …

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Application And Improvement Directions Of Rodless Drainage Technology In Coalbed Methane Wells: A Case Study From East Margin Of Ordos Basin, Ma Wentao, Liu Yinhua, Wu Jianjun, Wang Yubin, Wang Chengwang, Xu Wanyong Sep 2022

Application And Improvement Directions Of Rodless Drainage Technology In Coalbed Methane Wells: A Case Study From East Margin Of Ordos Basin, Ma Wentao, Liu Yinhua, Wu Jianjun, Wang Yubin, Wang Chengwang, Xu Wanyong

Coal Geology & Exploration

The eastern margin of Ordos Basin has a huge amount of coalbed methane resources, and has become one of the main coalbed methane producing areas in China. Since the development of the block, hydraulic rodless pump, hydraulic jet pump, electric submersible pump and diaphragm pump drainage and production process tests have been carried out for highly deviated wells and horizontal wells in medium shallow coal seam. During production, it is found that the above four types of rodless drainage and production processes have the advantages of effectively avoiding eccentric wear of pipes and rods in highly deviated wells and horizontal …

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Development Characteristics And Enlightenment Of Eagle Ford Deep Shale Gas Reservoirs In North America, Yu Rongze, Wang Chenghao, Zhang Xiaowei, Hu Zhiming, Sun Yuping, Guo Wei, Duan Xianggang, Wang Meizhu Sep 2022

Development Characteristics And Enlightenment Of Eagle Ford Deep Shale Gas Reservoirs In North America, Yu Rongze, Wang Chenghao, Zhang Xiaowei, Hu Zhiming, Sun Yuping, Guo Wei, Duan Xianggang, Wang Meizhu

Coal Geology & Exploration

The large-scale development of shale gas with a buried depth of less than 3 500 m within the overpressure Wufeng-Longmaxi Formation has been realized in Sichuan Basin, and the effective development of shale gas resources with a buried depth of 3 500-4 000 m is being explored currently. Eagle Ford is an emerging deep shale oil & gas reservoir, which is comparable to the domestic medium-deep development regions and deep exploration regions, and its development technology policy and learning curve are available for reference. The parameters of drilling, fracturing, production and cost of 6 223 wells are analyzed in the …

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