鄂尔多斯盆地靖边油田沙洼沟地区延安组延9油藏富集规律

Enrichment Enrichment Regularity of Y–9 Reservoir of Yan’an Formation in Shawagou Area of Jingbian Oilfield,Ordos Basin

基于储层基本特征、油藏分布及类型研究,利用基本成藏地质条件与油藏分布相叠合的方法,总结靖边沙洼沟延9油藏的油气富集规律。研究结果表明,研究区延9储层属于中孔–低渗储层,延9油藏类型为构造–岩性油藏,延9油藏的分布和富集受多因素控制,其中侏罗系古地貌对油藏的控制起先导作用,深切河谷为油气运移提供重要通道,有利相带和鼻状隆起构造为油气成藏提供了有利场所,隔层的发育状况及有效的生储盖组合控制了油藏纵向分布层位和规模。综合分析认为,在泥岩隔层不发育、分支河道砂体与构造隆起叠置部位是油气富集区,为勘探的重点部位。

Based on the study of reservoir characteristics,reservoir distribution and type,the oil and gas enrichment law of Y–9 reservoir in Shawagou Y–9 reservoir in Jingbian is summarized by using the method of superposition of basic reservoir forming geological conditions and reservoir distribution.The results show that Y–9 reservoir in the study area is a mesopore–low permeability reservoir,and Y–9 reservoir type is a tectonic–lithologic reservoir.Distribution and enrichment of Y–9 reservoir are controlled by various factors,including the Jurassic paleogeomorphology controls on reservoir play a leading role,provide important channels for hydrocarbon migration,deep valley favorable facies belt and nose–like uplift structure provides a favorable hydrocarbon accumulation place,the development of interlayer condition and effective reservoir and caprock controls the vertical distribution and scale of reservoirs.Comprehensive analysis shows that the area where mudstone interlayer is not developed,sand body of branch channel and superimposed tectonic uplift is the oil and gas rich area,which is the key position for exploration.