马元稹, 王猛, 马如英,等.海陆过渡相煤系页岩气储层微观特征及影响因素——以沁水盆地中东部Y2井为例[J].河南理工大学学报（自然科学版）,2023,42(5):80-92.

MA Y Z, WANG M, MA R Y, et al.Microscopic characteristics and influencing factors of coal-measure shale gas reservoirs in marine-continent transitional facies： Take the Y2 well in the mid-eastern Qinshui Basin as an example[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):80-92.

海陆过渡相煤系页岩气储层微观特征及影响因素——以沁水盆地中东部Y2井为例

马元稹1, 王猛2,3, 马如英1, 代旭光3, 谢卫东4, 李嘉敏1

1.新疆大学 地质与矿业工程学院，新疆 乌鲁木齐  830046;2.中国矿业大学 低碳能源研究院，江苏 徐州  221008;3.中国矿业大学 资源与地球科学学院，江苏 徐州  221116;4.中国地质大学（武汉）  资源学院，湖北 武汉  430074

摘要:为探讨沁水盆地中东部海陆过渡相煤系页岩气储层微观特征及影响因素，采用有机地球化学测试、SEM检测、全岩和黏土矿物X射线衍射分析、高压压汞和低温液氮吸附等试验获取Y2井山西组-太原组泥页岩孔隙微观特征。结果表明：（1）泥页岩中有机质类型为Ⅲ型（腐殖型），总有机碳（TOC）质量分数较高，平均1.79%，经历了较长热演化史；（2）泥页岩中主要发育粒内孔、粒间孔，有机质孔和微裂隙等，黏土矿物和石英中发育大量粒间孔和粒内孔；（3）SEM图像显示，泥页岩孔裂隙形态分形维数为2.34～2.51，非均质性中等；（4）高压压汞和低温液氮吸附试验表明，中孔为研究区泥页岩主要孔隙，对孔体积和孔比表面积影响较大，中孔孔体积、比表面积与TOC、石英体积分数正相关，与镜质组反射率（R_O）成负相关关系；（5）黏土矿物中伊利石对中孔孔体积和比表面积均有积极影响，高岭石则不利于中孔孔体积和比表面积发育。研究结果可为该地区煤系页岩气资源勘探开发提供指导。

关键词:煤系页岩气储层;孔隙特征;分形特征;微细特征影响因素;沁水盆地中东部

doi:10.16186/j.cnki.1673-9787.2020110075

基金项目:新疆维吾尔族自治区自然科学基金资助项目（2018D01C062）

收稿日期:2020/11/24

修回日期:2020/12/09

出版日期:2023/09/25

Microscopic characteristics and influencing factors of coal-measure shale gas reservoirs in marine-continent transitional facies： Take the Y2 well in the mid-eastern Qinshui Basin as an example

MA Yuanzhen1, WANG Meng2,3, MA Ruying1, DAI Xuguang3, XIE Weidong4, LI Jiamin1

1.College of Geology and Mining Engineering，Xinjiang University，Urumqi  830046，Xinjiang，China;2.Low Carbon Energy Institute，China University of Mining and Technology，Xuzhou  221008，Jiangsu，China;3.School of Resources and Geosciences，China University of Mining and Technology，Xuzhou  221116， Jiangsu，China;4.College of Resources，China University of Geosciences（Wuhan），Wuhan  430074，Hubei，China

Abstract:In order to explore the microscopic characteristics and their influencing factors of the coal-measure shale gas reservoirs in the mid-eastern Qinshui Basin，the microscopic pore structure in the shales of the Shanxi and Taiyuan formations from the Y2 well was acquired by means of organic geochemistry test，SEM test，bulk-rock and clay mineral XRD，high pressure mercury injection，and low temperature N2 adsorption analysis.The results showed that：（1）The organic matter in the shale was type Ⅲ（humic），and the total organic carbon（TOC）content was relatively high，with an average value of 1.79%，which had experienced a long and complex thermal evolution history.（2）Intragranular，intergranular，and organic matter pores and micro-cracks were mainly developed in the shales，and a large number of intergranular and intragranular pores were presented in clay minerals and quartz.（3）Based on two-dimensional SEM image analysis，the fractal dimension of the shale pore fracture morphology was between 2.34 and 2.51，and the heterogeneity was moderate.（4）The high-pressure mercury intrusion and N2 adsorption experiments were mainly aided to reveal the distribution patterns of the macropores and mesopores in the shales.Mesopore was the main pore type in the shales，which had great influence on pore volume and pore specific surface area.The volume and specific surface area of the mesopores were positively correlated with the total organic carbon content（TOC） and quartz content，and negatively correlated with the vitrinite reflectance（R_O）.（5）The illite content in clay minerals had a positive effect on the pore volume and specific surface area，but the present of kaolinite was not conducive to it.This research results had a theoretical guiding significance for the exploration of coal measures shale gas there.

Key words:coal-measure shale gas reservoir;pore characteristics;fractal characteristics;microscropic characteristics and influencing factors;mid-eastern Qinshui Basin

海陆过渡相煤系页岩气储层微...以沁水盆地中东部Y2井为例_马元稹.pdf