巨鹿地区石炭系—二叠系富有机质页岩孔隙结构特征及微观非均质性  

Pore Structure Characterization and Micro-Heterogeneity of Carboniferous-Permian Organic-Rich Shalein Julu

作　　者：姚双宏 李学元[1,2] 李澎 王慧军 陈尚斌 Yao Shuanghong;Li Xueyuan;Li Peng;Wang Huijun;Chen Shangbin(China University of Mining&Technology,Xuzhou,Jiangsu 221116,China;MOE Key Laboratory of Coal-bed Methane Resources and Accumulation Process,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Hebei Coalfield Geological Survey Institute,Xingtai 054000,Hebei,China)

机构地区：[1]中国矿业大学,江苏徐州221116 [2]煤层气资源与成藏过程教育部重点实验室,江苏徐州221116 [3]河北煤田地质勘查院,河北邢台054000

出　　处：《特种油气藏》2020年第4期41-48,共8页Special Oil & Gas Reservoirs

基　　金：江苏省自然科学基金面上项目“岩浆热异常影响页岩与煤储层物性的微观机理研究”(BK20181362);河北省财政厅预算科学研究类项目“河北省页岩气资源调查与潜力评价”(2014995001)。

摘　　要：为揭示巨鹿地区富有机质页岩孔隙的分形特征及微观非均质性,利用X射线衍射、扫描电子显微镜和低温液氮吸附等实验,对巨鹿地区富有机质页岩的孔隙结构进行定性及定量表征,运用FHH模型计算孔隙分形维数,并探讨微观非均质性的影响因素。研究结果表明:页岩矿物组成以黏土矿物和石英为主,其中,黏土矿物包括伊蒙混层、伊利石和绿泥石;孔隙类型包括有机质孔、粒间孔、矿物粒内孔和微裂隙;不同孔径范围内孔隙微观非均质性存在差异,4.34~100.00 nm范围内孔隙微观非均质性更强,分形维数与黏土矿物、脆性矿物含量分别呈正、负相关关系,构造及成岩作用也会影响孔隙微观非均质性。该研究可为巨鹿地区页岩气勘探提供理论依据。In order to reveal the fractal performance and micro heterogeneity of riched organic in shale pores,X-ray diffraction,scanning electron microscopy and low temperature liquid nitrogen adsorption were used to qualitatively and quantitatively characterize the pore structure of riched organic in shale in Julu.The FHH model was used to calculate the fractal dimension of pores and discuss the influencing factors of micro heterogeneity.Research indicates that the shale mainly composed by clay minerals and quartz.The corresponding clay minerals are dominated by illite-smectite mixed layer,illite and chlorite.The pores mainly consist of organic pore,intergranular pore and micro fracture.The micro heterogeneity shows a difference for different pore size intervals,and there is a stronger micro heterogeneity in the range of 4.34~100.00 nm.The fractal dimension is positively and negatively related to clay minerals and brittle minerals respectively.The pore micro heterogeneity is also dependent on the structure and diagenesis.This research could provide certain theoretical reference for the shale gas exploration in Julu.

关 键 词：富有机质页岩 孔隙特征 微观非均质性 石炭系-二叠系 巨鹿地区 

分 类 号：TE122[石油与天然气工程—油气勘探]