煤田地质与勘探2016，Vol.44Issue(5)：16-21,6.DOI:10.3969/j.issn.1001-1986.2016.05.003
鄂尔多斯盆地马五5亚段沉积微相分布及演化
Distribution and evolution of sedimentary microfacies of submember 5 Majiagou Formation in the Ordos basin
摘要
Abstract
The difference between lithology and depositional environment is the main cause of reservoir heteroge-neity in submember 5 Majiagou Formation of Lower Ordovician in the Ordos basin. According rock types, sedi-mentary structures, color and its relationship with sedimentary environment, two subfacies and seven microfacies in submember 5 Majiagou Formation are classified. subfacies include basin-marginal tidal flat and intra-platform basin. The former can be furtherly divided into four types microfacies, such as intra-platform margin (gypsum) dolomite depression, intra-platform margin dolomite tidal flat, intra-platform margin calcitic tidal flat and in-tra-platform margin dolomite calcitic–calcitic dolomite tidal flat. The latter can be furtherly divided into three types microfacies, such as basin (gypsum) dolomite depression, dolomite calcitic–calcitic dolomite basin and calcitic ba-sin. In the stage of submember 5-1 Majiagou Formation, Ordos basin basement uplift, the ancient land expand, re-duce sea level, shallow sea, the ancient central uplift belt out of the water are the performance of sedimentary mi-crofacies plane. North area is mainly developing intra-platform margin dolomite tidal flat-dolomite depression, in-tra-platform margin dolomite calcitic-calcitic dolomite tidal flat and calcitic basin. West area develop in-tra-platform margin dolomite tidal flat-dolomite depression, intra-platform margin dolomite calcitic-calcitic dolo-mite tidal flat. Center area develop calcitic basin, and mix dolomite calcitic basin and basin dolomite depression. In the stage of submember 5-2 Majiagou Formation, north area mainly developing intra-platform margin dolomite tidal flat and dolomite depression. Secondary microfacies include dolomite calcitic–calcitic dolomite tidal flat, cal- citic tidal flat. In western area, the main microfacies include intra-platform margin dolomite tidal flat and dolomite depression. In center area, the main microfacies include calcitic basin and basin dolomite depression.关键词
沉积微相/沉积演化/碳酸盐岩/马五5亚段/鄂尔多斯盆地Key words
sedimentary microfacies/sedimentary evolution/carbonate/submember 5 Majiagou Formation/Ordos basin分类
能源科技引用本文复制引用
包洪平,张云峰,王前平,董兆雄,武春英,杨西燕..鄂尔多斯盆地马五5亚段沉积微相分布及演化[J].煤田地质与勘探,2016,44(5):16-21,6.基金项目
国家科技重大专项课题(2011ZX05004-006)；四川省重点学科建设项目(SZD0414)@@@@National Science and Technology Major Project(2011ZX05004-006)；Key Discipline Construction Projects in Sichuan Province (SZD0414) （2011ZX05004-006）
