摘要
为了更全面地表征潜江凹陷潜江组页岩油储层孔隙结构特征,系统选取了距物源不同距离的A井和B井多块页岩样品进行了分析测试,通过场发射扫描电镜、低温氮气吸附和高压压汞实验综合分析了页岩孔隙结构特征;通过对比抽提前后场发射扫描电镜图像、低温氮气吸附和高压压汞实验数据,进一步研究了页岩中滞留烃的赋存空间特征;通过对典型页岩样品的二次压汞实验,探讨了页岩中连通孔隙的孔径分布特征。结果显示:潜江凹陷潜江组页岩油储层孔隙大小为纳米-微米级,孔径2~180 nm的黏土矿物层间孔和白云石晶间孔是该区发育最主要的两种孔隙类型;A井页岩中的滞留烃主要赋存在孔径2~20 nm的黏土矿物层间孔中,滞留烃含量较低,连通孔径主要集中在3~15 nm范围内,B井页岩中的滞留烃赋存在孔径8~100 nm的白云石晶间孔中,滞留烃含量多,连通孔径主要分布在10~130 nm范围内;白云石和黏土矿物的存在都有利于页岩储层储集空间的发育,但远离物源的生物成因的白云石更有利于滞留烃的赋存和可动性。研究成果可以为潜江凹陷页岩油的勘探和开发提供一定的理论支撑。
In order to more comprehensively characterize the pore structure characteristics of Qianjiang Formation shale oil reservoir in Qianjiang Sag,several shale samples from Well A and Well B with different distances from the source were systematically selected for analyzing and testing,and the pore structure characteristics of shale were comprehensively analyzed by field emission scanning electron microscope,low temperature nitrogen adsorption and mercury intrusion capillary pressure experiment;Making a further study by comparing the field emission scanning electron microscope images,low-temperature nitrogen adsorption and mercury intrusion capillary pressure experimental data on the occurrence space characteristics of retained hydrocarbons in shale;The pore size distribution of connected pores in shale is discussed through the secondary mercury injection experiments on typical shale samples.This study shows that the pore size of Qianjiang Formation shale oil reservoir in Qianjiang Sag is nanometer micron scale,and 2-180 nm clay mineral interlayer pore and dolomite intergranular pore are the two main pore types in this area;The retained hydrocarbon in Well A shale mainly exists in 2-20 nm clay mineral interlayer pores,the content of retained hydrocarbon is low,and the connected pore size is mainly concentrated in the range of 3-15 nm.The retained hydrocarbon in Well B shale mainly exists in 8-100 nm dolomite intergranular pores,the amount of retained hydrocarbon is large,and the connected pore size is mainly distributed in the range of 10-130 nm.The existence of dolomite and clay minerals is conducive to the development of shale reservoir space,but the biogenic dolomite far away from the source is more conducive to the occurrence and mobility of retained hydrocarbon.The research results can provide theoretical support for the exploration and development of shale oil in Qianjiang Sag.
作者
曾宏斌
王芙蓉
罗京
陶涛
吴世强
Zeng Hongbin;Wang Furong;Luo Jing;Tao Tao;Wu Shiqiang(Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geoscience(Wuhan),Wuhan 430074,China;Research Institute of Exploration and Development,SINOPEC Jianghan Oilfield Branch Company,Wuhan 430223,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2021年第5期242-252,共11页
Bulletin of Geological Science and Technology
基金
国家自然科学基金重点项目(41830431)
国家重大科技专项(2017ZX05049-005)。
关键词
页岩孔隙结构
高压压汞
低温氮气吸附
页岩油储层
潜江凹陷
江汉盆地
shale pore structure
high-pressure mercury injection
nitrogen adsorption
shale oil reservoir
Qianjiang Sag
Jianghan Basin
