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Pore structure characteristics of low-rank coal reservoirs with different ash yields and their implications for recoverability of coalbed methane—a case study from the Erlian Basin, northeastern China

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Frontiers of Earth Science 2023年第1期17卷 18-29页

作者： Dawei DONG Jiaosheng YANG Qiujia HU Shitao CUI Fenjin SUN Jidong ZHANG Xinrui CUI Shandong Institute of Petroleum and Chemical Technology Dongying 257061China PetroChina Research institute of petroleum exploration and development Beijing 100083China Shanxi CBM Exploration and Development Branch PetroChina Huabei Oilfield CompanyChangzhi 046000China China National Logging Corporation Xi’an 710077China

Pores are the main accumulation sites and migration pathways for coalbed methane(also referred to as CBM).Pore structure restricts the content and recoverability of CBM from coal *** this study,12 representative coal samples with different ash yields that have similar tectonic characteristics and burial depths were collected from different mining areas in the Jiergalangtu and Huolinhe depressions in the Erlian *** samples were used to study the restrictions of ash yield on the characteristics of coal pore structures and the recoverability of CBM through macroscopic and microscopic structure observation,scanning electron microscope observations,vitrinite reflectance tests,low-temperature N2 adsorption,nuclear magnetic resonance(NMR),and micro-computed *** results show that coal reservoirs in the study area vary greatly in ash yield,based on which they can be divided into three types,i.e.,low-ash-content,ash-bearing,and high-ash-content coal *** addition,the ash yield has a certain impact on the development of coal pores;coal samples with lower ash yields indicate the presence of well-developed medium-large pores and better *** yield also has a certain impact on the brittleness of coal wherein a lower ash yield implies the development of brittle coal that is more liable to fracture as compared to less brittle samples at the same *** gas content also varies significantly with ash yield;a low ash yield impacts the gas saturation of ***,for coal reservoirs in the study area,their porosity,pore diameter,movable fluid porosity,adsorbed gas amount,and recoverability decrease as the ash yield increases.

关键词： coal reservoir ash pore structure recoverability Erlian Basin

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In-situ stress of coal reservoirs in the Zhengzhuang area of the southern Qinshui Basin and its effects on coalbed methane development

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Energy Geoscience 2023年第2期4卷 17-27页

作者： Peng Zhang Ya Meng Chaoying Liu Yuanling Guo Xiangbin Yan Lixue Cai Zhe Cheng Petroleum Exploration and Development Research Institute SINOPECBeijing100083China Science and Technology Department SINOPECBeijing100728China School of Energy Resources China University of Geosciences(Beijing)Beijing100083China

In-situ stress is a critical factor influencing the permeability of coal reservoirs and the production capacity of coalbed methane(CBM)*** prediction of in-situ stress and investigation of its influence on coal reservoir permeability and production capacity are significant for CBM *** study investigated the CBM development zone in the Zhengzhuang area of the Qinshui *** to the low mechanical strength of coal reservoirs,this study derived a calculation model of the in-situ stress of coal reservoirs based on the multi-loop hydraulic fracturing method and analyzed the impacts of initial fractures on the calculated ***,by combining the data such as the in-situ stress,permeability,and drainage and recovery data of CBM wells,this study revealed the spatial distribution patterns of the current in-situ stress of the coal reservoirs and discussed the impacts of the insitu stress on the permeability and production *** results are as follows.(1)Under given fracturing pressure,longer initial fractures are associated with higher calculated maximum horizontal principal stress ***,ignoring the effects of the initial fractures will cause the calculated values of the in-situ stress to be less than the actual values.(2)As the burial depth increases,the fracturing pressure,closure pressure,and the maximum and minimum horizontal principal stress of the coal reservoirs in the Zhengzhuang area constantly *** average gradients of the maximum and minimum horizontal principal stress are 3.17 MPa/100 m and 2.05 MPa/100 m,respectively.(3)coal reservoir permeability is significantly controlled by the magnitude and state of the current in-situ *** coal reservoir permeability decreases exponentially with an increase in the effective principal ***,a low lateral pressure coefficient(less than 1)is associated with minor horizontal compressive effects and high coal reservoir permeability.(4)Under simil

关键词： In-situ stress coal reservoir Multi-loop hydraulic fracturing method Permeability Production capacity

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CO_(2)geological sequestration potential of the low-rank coals in the southern margin of the Junggar Basin

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Frontiers of Earth Science 2023年第3期17卷 727-738页

作者： Qun ZHAO Ze DENG Meng ZHAO Dexun LIU Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China PetroChina Southwest Oil&Gasfield Company Chengdu 610051China

Carbon capture,utilization,and storage(CCUS)is considered one of the most effective measures to achieve net-zero carbon emissions by 2050,and low-rank coal reservoirs are commonly recognized as potential CO_(2)storage sites for carbon *** evaluate the geological CO_(2)sequestration potential of the low-rank coal reservoirs in the southern margin of the Junggar Basin,multiple experiments were performed on coal samples from that area,including high-pressure mercury porosimetry,low-temperature N2 adsorption,overburden porosity and permeability measurements,and high-pressure CH4 and CO_(2)isothermal adsorption *** with the geological properties of the potential reservoir,including coal seam development and hydrodynamic characteristics,the areas between Santun River and Sigong River in the Junggar Basin were found to be suitable for CO_(2)***,the coal-bearing strata from Santun River to Sigong River can be defined as“potentially favorable areas for CO_(2)eequetfraiion”To better guide the future field test of CO_(2)storage in these areas,three CO_(2)sequestration modes were defined:1)the broad syncline and faulted anticline mode;2)the monoclinic mode;3)the syncline and strike-slip fault mode.

关键词： CO_(2)geological sequestration coalbed methane low-rank coal coal reservoir Junggar Basin

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Permeability variation characteristics of coal after injecting carbon dioxide into a coal seam

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International Journal of Mining Science and Technology 2015年第4期25卷 665-670页

作者： Ni Xiaoming Li Quanzhong Wang Yanbin Gao Shasha School of Energy Science and Engineering Henan Polytechnic University Collaborative Innovation Center of coalbed Methane and Shale Gas for Central Plains Economic Region College of Geoscience and Surveying Engineering China University of Mining & Technology

A theoretical basis for the optimization of carbon dioxide injection parameters and the development of the drainage system can be provided by identifying the permeability change characteristic of coal and rock after injection of carbon dioxide into the coal seam. Sihe, Yuwu, and Changcun mines were used as research sites. Scanning electron microscopy and permeability instruments were used to measure coal properties such as permeability and surface structure of the coal samples at different pH values of carbon dioxide solution and over different timescales. The results show that the reaction between minerals in coal and carbonate solution exhibit positive and negative aspects of permeability-the dissolution reaction between carbonate minerals in coal and acid solution improves the conductivity of coal whilst, on the other hand, the clay minerals in the coal （mainly including montmorillonite, illite and kaolinite） exhibit expansion as a result of ion exchange with the H~ in acid solution, which has a negative effect on the per- meability of the coal. The permeability of coal samples increased at first and then decreased with immer- sion time, and when the soaking time is 2-3 months the permeability of the coal reached a maximum. In general, for coals with permeabilities less than 0.2 mD or greater than 2 roD, the effect on the permeabil- ity is low： when the permeability of the coal is in the range 0.2-2 mD, the effect on the permeability is highest. Research into permeability change characteristics can provide a theoretical basis for carbon diox- ide injection under different reservoir permeability conditions and subsequent drainage.

关键词： Carbon dioxide coal reservoir Permeability Change characteristics

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coalbed Methane-bearing Characteristics and reservoir Physical Properties of Principal Target Areas in North China

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Acta Geologica Sinica(English Edition) 2004年第3期78卷 724-728页

作者： TANGShuheng SUNShenglin HAODuohu TANGDazhen ChinaUniversityofGeosciences（Beijing） Beijing100083 ChinaNationalAdministrationofcoalGeology Beijing100039 ChinaUniversityofMiningandTechnology（BeijingCampus） Beijing100083

The coalbed methane (CBM) resources in North China amounts up to 60% of total resources in China. North China is the most important CBM accumulation area in China. The coal beds of the Upper Paleozoic Taiyuan and Shanxi formations have a stable distribution. The coal reservoir of target areas such as Jincheng, Yanquan-Shouyang, Hancheng, Liulin, etc. have good CBM-bearing characteristics, high permeability and appropriate reservoir pressure, and these areas are the preferred target areas of CBM developing in China. The coal reservoirs of Wupu, Sanjiaobei, Lu'an, Xinmi, Anyang-Hebi, Jiaozuo, Xinggong and Huainan also have as good CBM-bearing characteristics, but the physical properties of coal reservoirs vary observably. So, further work should be taken to search for districts with high pressure, high permeability and good CBM-bearing characteristics. Crustal stresses have severe influence on the permeability of coal reservoirs in North China. From west to east, the crustal stress gradient increases, while the coal reservoirs permeability decreases.

关键词： coalbed methane (CBM) coal reservoir physical property crustal stress North China

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