特种油气藏2017，Vol.24Issue(2)：6-11,50,7.DOI:10.3969/j.issn.1006-6535.2017.02.002
鄂尔多斯盆地姬塬西部地区长6致密油储层砂体成因模式
Genesis Model of Sandbodies in Chang6 Tight Oil Reservoirs in the Western Area of Jiyuan, the Ordos Basin
摘要
Abstract
In this paper, the types, petrological characteristics, provenance characteristics, sedimentary environments and hydrodynamic conditions of sandbodies in Chang6 tight oil reservoirs in the western area of Jiyuan were analyzed based on drilling cores, logging and petrographic thin sections by using single well analysis, multiwall correlation and areal verification.Then, the genesis models of Chang6 sandbodies in the western area of Jiyuan, the Ordos Basin were accordingly established and verified from the viewpoint of spatial distribution laws of sandbodies.It is indicated that Chang6 sandbodies in the western area of Jiyuan are mainly composed of fine-very fine lithic arkose and feldspathic lithic sandstone, presenting the characteristics of NW-SE banded distribution and basinward progradation.They are thin with high shale content.River channels are characterized by strong lateral migration, obvious multicycle, poor vertical superimposition and good areal continuity.Chang6 sandbodies are in the sedimentary environment of shallow-water delta with the characteristics of near provenance and shallow water body, and it is an obvious regression process.In this sedimentary environment, Chang6 sandbodies are deposited in the model of "slow-fluctuation progradation" as the lake level drops slowly with fluctuation.The rationality of this sedimentary model is verified by areal distribution laws of sandbodies in the study area.The research results provide some geologic basis for the exploration and development of tight oil reservoirs.关键词
致密油储层/浅水三角洲/成因模式/姬塬西部地区/鄂尔多斯盆地Key words
tight oil reservoir/shallow-water delta/genesis model/western Jiyuan area/Ordos Basin分类
能源科技引用本文复制引用
牟炜卫,李树同,闫灿灿..鄂尔多斯盆地姬塬西部地区长6致密油储层砂体成因模式[J].特种油气藏,2017,24(2):6-11,50,7.基金项目
国家科技重大专项"南海北部深水区大型碎屑岩储集体油气成藏条件研究"(2011ZX05025-006-03) （2011ZX05025-006-03）
兰州油气资源研究中心"十三五"科技创新基金资助项目"鄂尔多斯盆地长7致密储层特征及黏土矿物对其影响研究"(35CCJJ20160510) （35CCJJ20160510）
