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为了研究陇东地区侏罗系延安组物源与沉积相展布情况,依据大量分析化验数据,根据砂岩岩石学特征、轻重矿物组合特征,配合钻井资料、测井分析等资料,结合邻区地层、沉积相研究成果等。分析认为研究区延安组早期物源主要来自西部逆冲推覆带及西南部,发育河流沉积体系和三角洲沉积体系,主要发育辫状河和三角洲前缘等亚相,其中辫状河河道砂坝和三角洲平原水上分流河道是重要的油气储集体。
In order to study the distribution of provenance and sedimentary facies in the Yanan Formation of the Jurassic in east Gansu, based on a large amount of analytical laboratory data, based on the characteristics of sandstone petrology, light and heavy mineral assemblages, drilling data and well logging analysis, , Sedimentary facies research results. It is concluded that the early Yan’an Formation in the study area mainly comes from the thrust belt in the western part of China and the southwestern part of the country, the developmental fluvial sedimentary system and the delta sedimentary system, mainly developing the braided river and the delta front. The braided river sand bar and Delta plain water distributary channel is an important oil and gas reservoir.