Effect of lithological heterogeneity on shale oil occurrence-a case study in Ansai oil field

doi:10.1007/s12517-021-09346-8

LZUFE-KMS

	Effect of lithological heterogeneity on shale oil occurrence-a case study in Ansai oil field
	Bojiang, Fan 1,2,3
	2022-01
发表期刊	ARABIAN JOURNAL OF GEOSCIENCES
卷号	15 期号:1
摘要	The semi-deep lacustrine shale in Ansai oil field has strong lithological heterogeneity. It includes four different types: shale, sandy shale, sandy laminated shale, and thin tight sandstone. The contribution of different rock types to the formation of shale oil is not clear. Moreover, the influence of different rock types on the occurrence of shale oil also lacks exploration. In this research, a comparative study based on geochemical analysis was carried out to resolve these challenges. The source rocks in the study area are moderately mature. There is a fine match between TOC and different rock types. The highest Total Organic Carbon content (TOC) is noticed in the shale, followed by sandy shale. In contrast, the lower TOC content is measured in the sandy laminated shale. The type of organic matter in most shale samples and sandy shale samples mainly comprises type I and type II1-II2 kerogen, respectively. In contrast, the type of organic matter in sandy laminated shale changes greatly. The hydrocarbon generating capacity of source rock is shale > sandy shale > sandy laminated shale. In the vertical distribution, the migration of oil and gas from the thick source rock is difficult relative to the thin source rocks. During the migration of hydrocarbons, the saturated hydrocarbons can easily migrate relative to non-saturated hydrocarbons/asphaltene. For instance, C-27 regular sterane relative to C-29 regular sterane and small molecular compounds relative to macromolecular compounds can easily migrate. The higher hydrocarbon expulsion efficiency is related to the higher content of saturated hydrocarbon compounds and the lower non-hydrocarbon and asphaltene compounds. Many geological factors may cause the difference in hydrocarbon expulsion. However, the differences in porosity and permeability are probably the most important factors affecting hydrocarbon expulsion.
关键词	Ansai oil field Lacustrine shale Shale oil Lithological heterogeneity Oil occurrence
DOI	10.1007/s12517-021-09346-8
收录类别	SCIE
ISSN	1866-7511
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000739994200007
出版者	SPRINGER HEIDELBERG
原始文献类型	Article
引用统计	被引频次[WOS]：0 [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.lzufe.edu.cn/handle/39EH0E1M/31546
专题	兰州财经大学
作者单位	1.State Key Lab Shale Oil & Gas Enrichment Mech & E, Beijing 102206, Peoples R China; 2.Sinopec Key Lab Shale Oil Gas Explorat & Prod Tec, Beijing 102206, Peoples R China; 3.Yanan Univ, Sch Petr & Environm Engn, Yanan 716000, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Bojiang, Fan. Effect of lithological heterogeneity on shale oil occurrence-a case study in Ansai oil field[J]. ARABIAN JOURNAL OF GEOSCIENCES,2022,15(1).
APA	Bojiang, Fan.(2022).Effect of lithological heterogeneity on shale oil occurrence-a case study in Ansai oil field.ARABIAN JOURNAL OF GEOSCIENCES,15(1).
MLA	Bojiang, Fan."Effect of lithological heterogeneity on shale oil occurrence-a case study in Ansai oil field".ARABIAN JOURNAL OF GEOSCIENCES 15.1(2022).