鄂尔多斯盆地J县西南部地区延9、延10油层组成藏控制因素研究

Study on Controlling Factors of Hydrocarbon Accumulation in Yan 9 and 10 Reservoirs in the Southwest of J County of Ordos Basin

通过对J县西南部地区延安组延9、延10油层组油气成藏条件分析认为,区内具长7油层组为优质的供烃源岩;延9、延10油层组砂体整体上呈南北向展布,为中孔低-中渗储层;延8、延7油层组泥岩为盖层的生储盖组合。J县西南部地区延安组油气富集的主控因素为前侏罗纪古地貌,其控制了油藏顶面构造、储层沉积相及砂体展布、油气运移方向和富集区。

The analysis of hydrocarbon accumulation conditions of Yan 9and Yan10 Reservoirs in the southwest of J County indicated that the source rocks in the area were the high quality source rocks in Chang 7Reservoir,the sand body of Yan 9and Yan10 Reservoirs had the characteristics of extending from the north to south,and it was a low porosity and low-medium permeability reservoir,the mudstone in Yan 8and 7Reservoirs is a source,reservoir and caprock assemblage in the area.The main control factors of hydrocarbon enrichment of Yanan Formation in the southwest of J County is the Pre-Jurassic ancient landform,which controls the structure on reservoir top,reservoir sedimentary facies and sand body distribution,oil and gas migration direction and enrichment area.