摘要
页岩油储层中的有机质一直是页岩油研究的重点。用电子背散射(HDBSD)详细地研究了松辽盆地古龙凹陷古龙页岩油储层中的有机质中的微孔,发现了古龙页岩油储层有机质中的微孔非常发育。有机质微孔可以分为4种类型:①结构镜质体微孔;②均质镜质体微孔;③沥青质体微孔;④有机黏土微孔。有机质微米孔的直径多在1μm到数微米,圆形、近圆形或不规则;研究还发现,古龙页岩油储层中的孔隙度与有机碳呈一定的正相关关系。对有机质中的微孔孔隙度进行了初步的定量分析,获得了平均值为22.39%;初步计算表明有机微孔对储层孔隙度总的贡献在0.44%左右(有机碳取2.0%)。有机质中的微米孔(包括其他微米孔)可以与更高一级的微缝和页理缝互相联结,构成了一个很好的空间连通网络系统,为松辽盆地古龙页岩油的有效开发奠定了物质基础。
Organic matter in shale oil reservoir has always been the focus of shale oil research.The organic matter and its micropores in Gulong shale oil reservoir are studied in detail by electron backscattering(HDBSD).It is found that the micropores in the organic matter of Gulong shale oil reservoir are very well developed,which can be divided into four types:①structural vitroplastid micropores;②Homogeneous vitrinite micropores;③Bituminous body micropores;④Organic clay micropores.The diameter of micron pores in organic matter is from 1 micron to several microns,and the shape is round,nearly round or irregular.Its genesis is related to the residuals of plant bacteria and algae,the volume shrinkage caused by hydrocarbon generation of organic matter and the charging expansion of light oil and natural gas.The preliminary quantitative analysis of micropores in bituminous bodies showed that the micropores accounted for 5.40%~30.66%of the surface area,with an average of 19.53%.It is also found that there is a positive correlation between porosity and organic carbon in Gulong shale oil reservoir.During hydrocarbon generation and expulsion,magmatic hydrothermal interaction is superposed to form a mineralrich organic multiphase fluid,which plays an important role in the pore-forming reservoir of asphalt bodies and organoclays,forming a kind of spongy organic hydrothermal organoclays rich in organic matter and pores.Preliminary calculation shows that the contribution of organic micropores to reservoir porosity is about 0.54%(2.69%for organic carbon).It is reasonable to assume that the(light)oil in organic micropores is a generalized in-situ reservoir.Micron pores in organic matter(including other micron pores)can be connected with higher micro fractures and shale fractures,forming a good spatial connectivity network system,which lays a material foundation for the effective and efficient development of Gulong shale oil.
作者
何文渊
赵莹
钟建华
孙宁亮
HE Wenyuan;ZHAO Ying;ZHONG Jianhua;SUN Ningliang(China National Oil and Gas Exploration and Development Company Ltd.(CNODC),Beijing,100034;Heilongjiang Provincial Key Laboratory of Continental Shale Oil,Daqing,Heilongjiang,163712;Research Institute of Exploration and Development,Daqing Oilfield Company Limited,Daqing,Heilongjiang,163712;School of Resources and Material,Northeastern University at Qinhuangdao,Qinhuangdao,Hebei,066004;School of Geosciences,China University of Petroleum(Eastern China),Qingdao,Shandong,266580)
出处
《地质论评》
CAS
CSCD
北大核心
2023年第3期1161-1183,共23页
Geological Review
基金
国家自然科学基金资助项目(编号:42072138、41572088)
中国石油天然气股份有限公司重大科技专项“大庆古龙页岩油勘探开发理论与关键技术研究”项目(编号:2021ZZ10)
黑龙江省“百千万”工程科技重大专项“松辽盆地北部古龙页岩油成藏条件及甜点分布规律研究”(编号:2020ZX05A01)的成果。
关键词
有机质
微米孔
储集空间
页岩油
松辽盆地
古龙凹陷
organic matter
micron pores
reservoir space
in-site oil pool
shale oil,Gulong Sag
