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Evaluation of gas content in organic-rich shale:A review of the history,current status,and future directions

Geoscience Frontiers 2024年第6期15卷 386-409页

作者： Haikuan Nie Wei Dang Qin Zhang Jinchuan Zhang Pei Li Shaohua Zhang Jianghui Ding Qian Chen Yubo Feng Xin Zhang State Key Laboratory of Shale Oil and gas Enrichment Mechanisms and Effective Development Beijing 102206China Petroleum Exploration and Production Research Institute SINOPECBeijing 100083China School of Earth Sciences and Engineering Xi’an Shiyou UniversityXi’an 710065China Key Laboratory of Tight Oil and gas Geology of National Petroleum and Chemical Industry Xi’an Shiyou UniversityXi’an 710065China PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China School of Energy Resources China University of GeosciencesBeijing 100083China National Elite Institute of Engineering CNPCBeijing 100096China

Shale gas is being hailed as the green energy of the future due to high heating value,low carbon emissions,and large *** content of shale is a key parameter for evaluating the shale gas potential and screening for the shale gas sweet *** the concept of gas content has been well defined,obtaining a reliable gas content data still remains a challenge.A significant barrier is the method for evaluating the gas *** this paper,we provide a review of the long-established and recently developed gas content evaluation *** the first part of this review article,the history of gas content evaluation methods is summarized since 1910s,relied on published and unpublished literatures as well as our own ***,the fundamental contents and concepts involved in gas content evaluation are introduced to provide a clear theoretical foundation for the *** the third part,eleven evaluation methods,including four direct methods and seven indirect methods,are systematically *** each method,its application to evaluating the gas content is presented,the key advances are highlighted,and the advantages and limitations are ***,future directions are discussed to promote creative thinking across disciplines to develop new methods or improve current methods for evaluating the gas content more accurately and efficiently.

关键词： Shale gas Lost gas Adsorbed gas gas content Evaluation methods

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Influence of Ground Stress on Coal Seam gas Pressure and gas content

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Fluid Dynamics & Materials Processing 2019年第1期15卷 53-61页

作者： Xuebo Zhang Zhiwei Jia The Collaborative Innovation Center of Coal Safety Production of Henan Province Jiaozuo45400China State Key Laboratory Cultivation Base for gas Geology and gas Control Jiaozuo45400China School of Safety Science&Engineering Henan Polytechnic UniversityJiaozuo45400China

The influence of ground stress was quantitatively analyzed on coal seam gas pressure and gas content in this *** activities in coal mine can result in stress concentration in the coal(rock)body around the mining space,but porosity of the coal seam would not change too ***,gas pressure and gas content in the coal seam are slightly *** showed that the free gas was gradually transformed into adsorbed gas,and the gas adsorption volume was small,and then gas pressure increases roughly linearly when the porosity decreased because of stress ***,when porosity of coal seam reduced to 40%,the amount of adsorbed gas accounted for no more than 10%of coal seam gas content,and the increase of gas pressure did not exceed 15%of the original gas pressure.

关键词： Ground stress coal seam porosity gas pressure gas content stress concentration.

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Analysis and verification of gas content and pressure change rate characteristics in hydraulic system

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High Technology Letters 2019年第3期25卷 326-333页

作者： Han Heyong Liu Yuan Qin Lixia Wang Kai Peng Huayu Collaborative Innovation Center of Taiyuan Heavy Machinery Equipment Taiyuan University of Science and Technology

gas content of the hydraulic system directly affects the rate of pressure change of the hydraulic system. The purpose of this paper is to establish a mathematical model of oil gas content, hydraulic system pressure and pressure rise rate, obtain corresponding oil pressure value when the pressure rise rate of different gas content is maximum, and verify the accuracy of this conclusion by the FLUENT simulation software. On this basis, a rapid pressure building device of the hydraulic system is developed and designed. The above oil pressure value is used as the working cut-off pressure of the rapid pressure building device, and then the hydraulic oil pump continues to pressurize to the highest working pressure required by the system. The research content can replace the hydraulic system from the initial low pressure to the rapid pressure build-up of the oil, thus increasing the construction pressure of the hydraulic system. The research results show that the rapid pressure building device effectively reduces the time for the hydraulic system to establish pressure. Through the analysis of theoretical derivation and the collected experimental data, the error is about 5.9%, which verifies the correctness of the theoretical formula.

关键词： hydraulic system gas content establishment of pressure rate rapid pressure building device pressure building time

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Forward modeling and inversion of the relation model between the gas content of plume and its seismic attribute

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Acta Oceanologica Sinica 2021年第5期40卷 120-128页

作者： Canping Li Jiachun You Yanchun Tan Fengying Chen Yilin Liu Zihao Guo Xinyu Tian School of Electronics and Information Engineering Guangdong Ocean UniversityZhanjiang 524088China Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang) Zhanjiang 524006China School of Geophysics Chengdu University of TechnologyChengdu 610059China

The methane bubble plume attracts interest because it offers direct evidence of seafloor gas leakage and plays an indirect role in the exploration and identification of natural gas *** this study,based on established plume models and their migration sections,three amplitude-class attributes were extracted from three formations for the migration sections of five plumes,and the correlation between the gas content and seismic attribute was *** the gas content increases,the amplitude attribute correspondingly increases,and the linear correlation is relatively ***,correlation coefficients between gas content and amplitude attributes are close to *** using linear fitting,the relation model between the gas content of the plume and the seismic attribute was *** relation model was subsequently used to invert the gas content from a real databearing *** of the gas content section of the plume with the attribute section and real seismic section reveals common distribution characteristics,namely,the color of the section in the lower right corner is *** the amplitude value is large in the seismic section of the real plume,the amplitude attribute value is also large in the corresponding attribute section,and the inverted value of the gas content is also large(because gas content and amplitude are linearly correlated),which indicates that the plume bubbles of the section in the lower right corner is intensively ***,the obtained gas content section of the plume can reflect the distribution of the plume bubble content more simply and intuitively,from which the distribution law of seafloor bubbles can be deduced,and this lays a foundation for the further estimation of the gas content of the plume and hydrate reserves.

关键词： methane plume natural gas hydrate gas content seismic attribute linear fitting

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New technology of determining coalbed gas content by reversion seal coring

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Journal of Coal Science & Engineering(China) 2012年第1期18卷 35-38页

作者： Chen, Shao-jie Cheng, Gen-yin Xu, A-meng Chen, Xue-xi School of Safety Engineering North China Institute of Science and Technology Beijing China School of Civil and Environment Engineering University of Science and Technology Beijing Beijing China

The key of the direct method of determining coalbed gas content is how to shorten the coal core exposure time in the sampling progress and reduce measuring error of gas content which comes from the calculation of losing gas content. The coring tests were carried out in No.24 drilling field of 715 floor gateway in Qinan Coal Mine by using traditional drill core bar- rel sampler and self-designed reversion seal coring equipment. The losing gas content was calculated by power functional method, and the gas content of two coring methods was determined, respectively. Results show that, compared with traditional drill core barrel sampling, the newly seal coring equipment can significantly shorten the coal core exposure time, the 30 min desorption gas content increases obviously, the calculation of losing gas content reduces by 56.99%, the desorption gas content in normal atmosphere increases by 113.24%, and the determining value of gas content increases by 10.06%. The new technol- ogy has much higher accuracy, and it is worthwhile to be popularized.

关键词： gas content seal coring exposure time losing gas content

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Influencing factors of gas content evaluation for shale gas:a case study of Lower Paleozoic Wuling fold belt in Upper Yangtze Basin

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Global Geology 2014年第1期17卷 18-23页

作者： MIAO Qishi PAN Baozhi ZHAI Ting YANG Mingyu Logging Engineering Company East China Petroleum BureauSinopec College of Geo-Exploration of Science and Technology Jilin University

Factors of shale gas accumulation can be divided into the external and internal factors,according to accumulation mechanism and characteristics of shale gas. The internal factors mainly refer to parameters of organic geochemistry,mineral components and physical parameters. Six factors were presented in this study,i. *** matter,maturity,quartz,carbonate,clay mineral and pore. The external factors mainly refer to geologic environment of shale gas reservoir,including four factors: temperature,pressure,depth and *** on the experiment results of 26 samples of drilling cores from Wuling fold belt in Lower Paleozoic Silurian of the Upper Yangtze Basin,combined with the integrated analysis of geology,logging and test,the correlation of the gas content of shale gas to the above-mentioned ten factors was concluded. Six important evaluation indicators were preliminarily established in the gas-bearing core area of marine shale in the Upper Yangtze Basin.

关键词： shale gas gas content influencing factor marine shale Upper Yangtze Basin

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Advances in gas content based on outburst control technology in Huainan, China

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International Journal of Mining Science and Technology 2014年第3期24卷 385-389页

作者： Xue Sheng Yuan Liang Xie Juna Wang Yucang CSIRO Earth Science and Resource Engineering Kenmore QLD 4069 Australia Key Laboratory of Integrated Coal Exploitation and gas Extraction Anhui University of Science and Technology School of Mining Engineering Taiyuan University of Science and Technology National Engineering Research Centre for Coal Mine gas Control

The sudden and violent nature of coal and gas outbursts continues to pose a serious threat to coal mine safety in China. One of the key issues is to predict the occurrence of outbursts. Current methods that are used for predicting the outbursts in China are considered to be inadequate, inappropriate or impractical in some seam conditions. In recent years, Huainan Mining Industry Group(Huainan) in China and the Commonwealth Scientific and Industrial Research Organisation(CSIRO) in Australia have been jointly developing technology based on gas content in coal seams to predict the occurrence of outbursts in Huainan. Significant progresses in the technology development have been made, including the development of a more rapid and accurate system in determining gas content in coal seams, the invention of a sampling-while-drilling unit for fast and pointed coal sampling, and the coupling of DEM and LBM codes for advanced numerical simulation of outburst initiation and propagation. These advances are described in this paper.

关键词： Coal mining Outburst Outburst prediction gas content Numerical model ing

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Optimal depth of in-situ pressure-preserved coring in coal seams considering roadway excavation and drilling disturbance

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Petroleum Science 2024年第5期21卷 3517-3534页

作者： Peng-Fei Cui De-Lei Shang Peng Chu Ju Li Da-Li Sun Tian-Yu Wang Ming-Zhong Gao He-Ping Xie State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen518060GuangdongChina Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060GuangdongChina State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065SichuanChina School of Mechanical Engineering Sichuan UniversityChengdu610065SichuanChina Jinshi Drilltech Co. Ltd.Tangshan063004HebeiChina

Using pressure-preserved coring technique to determine in-situ gas content provides a more precise assessment of gas resource reserves and safeguard of mining safety in coal seams. How coring technique and depth affect the determination of gas content is unclear due to borehole zoning rupture caused by roadway excavation and drilling disturbance. To this end, a proposed coupling model of stress distribution and gas migration was simulated and validated by FLAC^(3D) and COMSOL Multiphysics considering superposition effects of roadway excavation and drilling disturbance. The findings indicate that the roadway surrounding rock displays distinct zoning features including stress relief zone, stress concentration zone that is composed of plastic zone, elastic zone, and original stress zone;and the broken situations depending on the borehole peeping are consistent with the corresponding simulation *** this basis, this study proposes a set of drilling coring depth calculation and prediction model for the gas desorption affected area under engineering disturbance. Optimal depth of coring drilling is not only approach to the in-situ coal bulk, but also can get the balance of the drilling workload and cost controlling. According to the typical mine site geological conditions and the numerical simulation results in this study, if the roadway excavation time is ~1 year, it is recommended that the pressure-preserved coring depth should be greater than 17 m.

关键词： In-situ fidelity coring In-situ pressure preserved coring gas content Drilling disturbance Coring depth Excavation damage zone

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Study on Hydraulic System Efficiency of Heaving-Buoy Wave Energy Converter

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Journal of Ocean University of China 2018年第5期17卷 1044-1052页

作者： SHI Hongda ZHAO Chenyu LIU Zhen CAO Feifei College of Engineering Ocean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Ocean Engineering Qingdao 266100China

The hydraulic system is the key component in the widely used wave energy converters(WEC).In this paper,we theoretically analyze and describe our investigation of the efficiency of the hydraulic system by simulation and model testing of the combined heaving-buoy *** derive a new governing equation that includes nonlinear hydraulic resistance in the power take-off(PTO).We conducted a physical model experiment based on a 100-kW prototype and applied a hydraulic system with an energy *** model test results reveal an important parameter related to efficiency with respect to nonlinear hydraulic *** also studied the relationship between the efficiency and the initial ***,based on our numerical simulation results,we discuss the effect on efficiency of the gas content of the hydraulic fluid and ways to reduce its impact.

关键词： hydraulic system PTO nonlinear hydraulic resistance efficiency gas content

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An experimental study on microscopic characteristics of gas-bearing sediments under different gas reservoir pressures

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Acta Oceanologica Sinica 2021年第10期40卷 144-151页

作者： Zhenqi Guo Tao Liu Lei Guo Xiuting Su Yan Zhang Sanpeng Li Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Institute of Marine Science and Technology Shandong UniversityQingdao 266237China College of Marine Geosciences Ocean University of ChinaQingdao 266100China

gas-bearing sediments are widely distributed in five continents all over the *** of the gases exist in the soil skeleton in the form of discrete large *** existence of gas-phase may increase or decrease the strength of the soil *** far,bubbles’structural morphology and evolution characteristics in soil skeleton lack research,and the influence of different gas reservoir pressures on bubbles are still *** micro characteristics of bubbles in the same sediment sample were studied using an industrial CT scanning test system to solve these *** the image processing software,the micro variation characteristics of gas-bearing sediments in gas reservoir pressure change are *** results show that the number and volume of bubbles in different equivalent radius ranges will change regularly under different gas reservoir *** the increase of gas reservoir pressure,the number and volume of tiny bubbles *** contrast,the number and volume of large bubbles increase,and the gas content in different positions increases and occupies a dominant position,driving the reduction of pore water and soil skeleton movement.

关键词： micro characteristics CT scanning gas content number and volume of bubbles gas reservoir pressure seabed sediments

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