南华北盆地下二叠统泥页岩孔隙特征及控制因素  

Characteristics of pores and controlling factors of Lower Permian shales in Southern North China Basin

作　　者：刘艳杰 程党性[4,5] 邱庆伦[2,3] 瓮纪昌[6] 王晓瑜 郭力军 李朋朋[8] 鲁新川 LIU Yan-jie;CHENG Dang-xing;QIU Qing-lun;WENG Ji-chang;WANG Xiao-yu;GUO Li-jun;LI Peng-peng;LU Xin-chuan(Henan Institute of Geological Sciences,Zhengzhou 450001,China;Henan Institute of Geological Survey,Zhengzhou 450001,China;Henan Industry&Technology Innovation Strategy Alliance of Underground Clean Energy Exploration and Development,Zhengzhou 450000,China;Research Institute of Exploration and Development,PetroChina Changqing Oilfieid Company,Xi’an 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi’an 710018,China;Henan Yukuang Geological Exploration Investment Co.Ltd.,Zhengzhou 450012,China;Exploration and Development Research Institute,PetroChina Qinghai Oilfield Company,Dunhuang 736200,China;Northweest Institute of Eco-Environment and Resources,CAS,Lanzhou 730000 China)

机构地区：[1]河南省地质科学研究所,河南郑州450001 [2]河南省地质调查院,河南郑州450001 [3]地下清洁能源勘查开发产业技术创新战略联盟,河南郑州450000 [4]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [5]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [6]河南豫矿地质勘查投资有限公司,河南郑州450012 [7]中国石油青海油田公司勘探开发研究院,甘肃敦煌736200 [8]中国科学院西北生态环境资源研究院,甘肃兰州730000

出　　处：《天然气地球科学》2020年第10期1501-1513,共13页Natural Gas Geoscience

基　　金：河南省重大科技专项“河南页岩气勘查开发及示范应用研究”(编号:151100311000);国家科技重大专项(编号:2017ZX05001002-008);中国科学院学部项目(编号:E0290803)联合资助.

摘　　要：泥页岩孔隙特征研究是评估页岩气储集能力和评价页岩气开采可行性的关键一步。以南华北盆地MY1井下二叠统山西组和太原组泥页岩样品为研究对象,通过场发射扫描电镜(FE⁃SEM)、低温氮气吸附、X⁃射线衍射、等温吸附、有机碳(TOC)含量和镜质体反射率(RO)等实验手段,对南华北盆地下二叠统泥页岩孔隙特征及其控制因素进行了研究。结果表明:南华北盆地下二叠统泥页岩孔隙类型包括粒间孔、晶间孔、有机孔、黏土矿物聚合孔、矿物颗粒表面溶孔和微裂缝,其中黄铁矿粒间孔和黏土矿物聚合孔、有机-黏土矿物复合孔和有机质收缩缝比较发育,表面溶孔不发育;孔体积在0.0040~0.0528 cm3/g之间,平均值为0.0196 cm3/g,比表面积在1.1989~26.5257 m2/g之间,平均值为9.5062 m2/g。平均孔径在2.35~14.38 nm之间,平均值为8.68 nm。泥页岩孔体积和比表面积同步增加,但不同孔径段孔隙对孔体积和比表面积贡献有差异,比表面积主要由孔径小于10 nm的孔隙贡献,而孔径主要由孔径大于10 nm的孔隙贡献,孔体积和比表面积随孔径的增量曲线呈单峰分布。有机质含量和矿物类型及其含量共同制约着孔隙的发育。The key step in evaluating shale gas reservoir capacity and feasibility of shale gas exploitation is the re⁃search on pore characteristics of shale.By means of field emission electron microscopy,low temperature nitro⁃gen adsorption,X-ray diffraction,organic carbon(TOC)content and vitrinite reflectance(RO),the paper in⁃vestigates the pore characteristics and controlling factors of Permian shale from Well MY1 in Southern North China Basin.The results show that the pore types of Lower Permian shale are intergranular pores,inter-crystal pores,organic pores,dissolution pores on the surface of mineral particles and micro-fractures,in which intercrystal pores of pyrite,intergranular pores of clay mineral polymer,organic-clay mineral combined pores and contraction joints of organic matters are relatively developed,and dissolution pores on the surface of mineral par⁃ticles is not developed.Pore volume is in the range of 0.0040~0.0528 cm3/g,with a mean of 0.01962 cm3/g;specific surface area ranges from 1.1989 m2/g to 26.5257 m2/g,on average of 9.506 m2/g;average pore diame⁃ter is within 2.35~14.38 nm,with an average of 8.68 nm.Pore volume and specific surface area of shales in⁃crease synchronously,while pores within different pore diameters makes different contributions to pore volume and specific surface area of shales,such as pores with pore size more than 10 nm mainly contribute to pore vol⁃ume and with pore size less than 10 nm mainly contribute to specific surface area.Unimodal distributions for the incremental curves of pore volume and specific surface area with increasing pore diameter can be observed.The content of organic matter and the types of minerals and their respective contents jointly govern pore developed conditions.

关 键 词：孔隙特征 氮气吸附 下二叠统泥页岩 MY1井 南华北盆地 

分 类 号：TE122.23[石油与天然气工程—油气勘探]