沉积学报2017，Vol.35Issue(2)：315-329,15.DOI:10.14027/j.cnki.cjxb.2017.02.010
鄂尔多斯盆地南部延长组泥页岩孔隙特征及其控制因素
Pore Characteristics and Controlling Factors of the Yanchang Formation Mudstone and Shale in the South of Ordos Basin
摘要
Abstract
Taking the Yanchang Formation Shale for Well YK-1 in Tongchuan Area of the south of Ordos Basin as the target,pore characteristics and controlling factors were investigated by using Argon-ion Polishing Scanning Electron Microscope (SEM) and low-temperature nitrogen adsorption experiments.The results show that pores of Yanchang Formation shale can be classified into inter-granular pore,intra-granular pore,intra-crystalline pore in pyrite,dissolved pore and micro-cracks,of which inter-granular pore in clay mineral is most developed,but organic pore is basically not developed.The pore characteristics of Yanchang Formation in different members have obvious differences.Chang 9 has larger proportion of micropores along with larger specific surface area,while the pore volume of Chang 8 is occupied by largest mesopores and pore morphology of Chang 8 and Chang 9 is mainly in the shape of column and slit parallel to the wall.Chang 7 has the largest proportion of macropores,smallest proportion of micropores and corresponding smallest specific surface area,of which there are many close pores and wedge-shaped pores with one or both ends open.The proportion of pore volume and specific surface area of Chang 6 are between other members,the pore morphology of which is mainly parallel-plate shaped silt pores.The content of clay is the main controlling factor of pore development,but TOC content shows a negative correlation with the pore volume and the specific surface area,mainly due to residual hydrocarbon which block the pore space.The pore volume,the specific surface area will increase after extraction.关键词
延长组泥页岩/孔隙特征/低温氮气吸附/残留烃Key words
Yanchang shale/pore characteristic/low-temperature nitrogen adsorption/residual hydrocarbon引用本文复制引用
李成成,周世新,李靖,杨亚南,付德亮,马瑜,李源遽..鄂尔多斯盆地南部延长组泥页岩孔隙特征及其控制因素[J].沉积学报,2017,35(2):315-329,15.基金项目
国家重大专项项目(2016ZX05003002-004,2016B-0502) （2016ZX05003002-004,2016B-0502）
中国科学院先导专项(XDB10010103) （XDB10010103）
国家自然科学基金项目(41072105)[National Science and Technology Major Project,No.2016ZX05003002-004,2016B-0502 （41072105）
CAS Priority Research Program,No.XDB10010103 （）
National Natural Science Foundation of China,No.41072105] （）
