油气地质与采收率2024，Vol.31Issue(4)：42-59,18.DOI:10.13673/j.pgre.202405018
中国东西部陆相页岩油地质特征差异性分析及其对富集规律影响
Difference analysis of geological characteristics of continental shale oil in eastern and western China and its influence on enrichment law:A case study of exploration area of Shengli Oilfield
摘要
Abstract
The exploration area of Shengli Oilfield was studied,and the difference in geological characteristics of shale oil in conti-nental lake basins in eastern and western China and its influence on the enrichment law were systematically compared.Controlled by paleogeomorphology,paleoclimate,paleowater medium,and other factors in Eocene The Upper Submember of 4th Member of Eo-cene Shahejie Formation(Es4U)-The Lower Submember of 3rd Member of Eocene Shahejie Formation(Es3L)of Jiyang Depression,the organic-rich lamellar carbonate shale was widely distributed.The synergistic evolution of hydrocarbon generation of organic-rich clay lamina and reservoir formation of carbonate-rich lamina provided favorable conditions for the large-scale enrichment of free hy-drocarbons.The strong rifting of Fengcheng Formation in Hashan area in the northwest margin of Junggar Basin led to strong volca-nic activity.Under the combined influence of volcanic eruption materials and paleoclimate,large-scale distribution of organic-rich lamellar alkali-bearing felsic shale lithofacies was observed.More felsic minerals were formed during the evolution of hydrocarbon generation and reservoir formation,accompanied by a large number of matrix dissolution pores and intercrystalline pores,which laid an essential foundation for shale oil enrichment.In the process of multi-stage thrusting in Hashan area,the quasi-in-situ system continued to generate hydrocarbons,with more oil and less gas.The relatively good storage conditions,as well as abnormal high pressure caused by structural overburden pressure and pressurization due to hydrocarbon generation,provide necessary conditions for high shale oil production.Under the background of salt water in Haiji Lake,Lucaogou Formation in the southeastern margin of Junggar Basin was affected by volcanic debris and microorganisms to form the primary lithofacies combination type of organic-rich lamellar shale and organic-poor interlayer dolomite.The organic-rich shale of Lucaogou Formation in the piedmont zone around Bogda Mountain has entered the mature evolution stage,and the structural stability area in the exploration area of Shengli Oilfield was a potential area for shale oil exploration.关键词
陆相页岩油/页岩岩相/富集规律/济阳坳陷/哈山地区/准东南地区Key words
continental shale oil/shale lithofacies/enrichment law/Jiyang Depression/Hashan area/southeastern margin of Junggar Basin分类
能源科技引用本文复制引用
张奎华,王越,于洪洲,周健,汪誉新,宋梅远,倪胜利..中国东西部陆相页岩油地质特征差异性分析及其对富集规律影响[J].油气地质与采收率,2024,31(4):42-59,18.基金项目
中国石化科技攻关项目"准噶尔盆地石炭—二叠系潜力评价与目标优选"(P21077-1)和"准噶尔盆地山前构造带勘探潜力及突破方向研究"(P22079). （P21077-1）
