延安地区上三叠统长6期沉积特征及其演化

Sedimentary characteristics and evolution during Upper Triassic Chang 6 stage in Yan'an Area

摘要: 通过对川口油田测井曲线和岩心分析,总结了延安地区上三叠统长6期沉积微相特征,建立了长6期岩性和测井曲线的响应模式。再结合分析沉积的演化过程、电性和物性特征、骨架砂体的几何形态和沉积演变,得出该地区沉积相和演化模式。认为从长6₄到长6₁期沉积环境为湖泊、三角洲前缘、三角洲平原亚相到河流相。长6₁、长6₂是主力储层,其物性最好。

Abstract: According to analysis results of logging curve and cores in Chuankou oilfield,the study area's rock-logging model of Chang 6 is established.Moreover,the sedimentary facies and evolution model are also established through analyzing sedimentary evolution processes,logging and physical characters,the geometry form of sandbody framework.A conclusion is got that the facies of lake,delta front and plain and river appear in turn.The intervals of Chang 6₁ and Chang 6₂ are the main oil-bearing intervals and their characters are the best among 4 oil-bearing intervals of Chang 6.