河北地质大学学报2025，Vol.48Issue(1)：25-35,11.DOI:10.13937/j.cnki.hbdzdxxb.2025.01.003
鄂尔多斯盆地南部下寺湾探区致密油形成条件及富集模式
Formation Conditions and Enrichment Pattern of Tight Oil in Xiasiwan Prospect,Southern Ordos Basin,China
摘要
Abstract
The study of tight oil in Xiasiwan Prospect in the south of Ordos Basin is still in the initial stage.For this reason,the study was carried out based on a large number of physical cores and assay analysis data.The study shows that the crude oil properties of Chang7 tight oil are good,the organic matter abundance of hydrocarbon source rock is high,the organic matter type is mainly type Ⅰ and Ⅱ1,followed by Ⅱ2,and the organic matter body is in the stage of maturity-high maturity,so it can be concluded that the overall evaluation of Chang7 oil shale is a good hydrocarbon source rock.The pores and cracks in the reservoir form favorable channels for oil and gas transportation and hydrocarbon drainage.The development of stable and continuous overpressure body in the Long 7 section provides sufficient and stable power for oil and gas transportation.According to the spatial configuration of the reservoir cover,the distribution characteristics of the discovered hydrocarbons and the main controlling factors of the enrichment,the oil and gas enrichment mode in the study area can be divided into four modes,i.e.the mode of"thin sandy sandwiches in contact with the hydrocarbon source rock in the form of a finger",the mode of"inverted enrichment",the mode of"sandwich enrichment",and"in-situ retention and aggregation".关键词
鄂尔多斯盆地/下寺湾探区/致密油/形成条件/富集模式Key words
Ordos Basin/Xiasiwan area/tight oil/formation conditions/enrichment pattern分类
地质学引用本文复制引用
张凤博,胡慧,杨连如,李锦峰,鲁金凤..鄂尔多斯盆地南部下寺湾探区致密油形成条件及富集模式[J].河北地质大学学报,2025,48(1):25-35,11.基金项目
国家科技重大专项(2017ZX05039001) （2017ZX05039001）
