渤海湾盆地东营凹陷沙河街组页岩油储层微观孔隙特征

发布时间：2018-04-13 12:53

本文选题：页岩油储层 + 微观孔隙类型　；参考：《地质学报》2017年03期

【摘要】：通过场发射环境扫描电镜、低温氮气吸脱附实验、高分辨率背散射电子图像定量分析等技术方法,对渤海湾盆地东营凹陷沙河街组页岩油储层的微观孔隙类型、结构特征及孔隙分布进行了系统研究。结果表明:沙河街组页岩油储层微观孔隙类型多样,包括粒间孔、粒内孔、晶间孔、溶蚀孔和晶内孔5类孔隙。有利储集空间为孔径在100~3000nm的孔隙,以粒间孔、粒内孔和溶蚀孔为主。泥岩类和灰岩类孔隙形态包括细颈瓶状(墨水瓶状)和平行板状;白云岩类孔隙形态为平行板状,连通性最好。白云岩类定量面孔率最大且孔隙发育最好,其次为泥岩类,灰岩类较差。影响微观孔隙特征的主要因素包括矿物成分及含量、有机质生排烃和热液作用,其中黏土矿物和泥级颗粒有利于储层微孔发育,方解石的胶结作用和重结晶作用不利于孔隙发育。生排烃产生的有机酸和热液作用增进了次生孔隙的形成。
[Abstract]:By means of field emission environment scanning electron microscope (SEM), low temperature nitrogen adsorption and desorption experiment, and quantitative analysis of high resolution backscatter electron image, the micropore types of Shale oil reservoir of Shahejie formation in Dongying depression of Bohai Bay Basin are studied.Structural characteristics and pore distribution were systematically studied.The results show that the micropore types of Shale oil reservoir in Shahejie formation are various, including intergranular pore, intragranular pore, intergranular pore, solution pore and intergranular pore.The favorable reservoir space is pore size in 100~3000nm, mainly intergranular pore, intragranular pore and solution pore.The pore morphology of mudstone and limestone includes fine neck flask (ink bottle) and parallel plate, dolomite pore is parallel plate, connectivity is the best.Dolomite has the largest quantitative porosity and the best pore development, followed by mudstone, limestone is poor.The main factors affecting micropore characteristics include mineral composition and content, hydrocarbon generation and hydrothermal action of organic matter, among which clay minerals and mud particles are conducive to the development of micropores in the reservoir.The cementation and recrystallization of calcite are not conducive to pore development.The formation of secondary pores is enhanced by organic acids and hydrothermal processes produced by hydrocarbon generation and expulsion.
【作者单位】：油气藏地质及开发工程国家重点实验室成都理工大学;中国石化胜利油田分公司勘探开发研究院;
【基金】：国家科技重大专项(编号2011zx05011)资助成果
【分类号】：P618.13

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