利用地震相识别渤中凹陷沙河街组三段优质烃源岩

Identification of High-quality Source Rocks in the Third Member of Shahejie Formation in Bozhong Sag by Seismic Facies

利用地震资料,结合沙河街组三段精细地震层位标定的基础,对渤中凹陷沙河街组三段地震层位进行追踪解释。根据钻遇井中沙河街组三段岩心取样为深灰、黑灰泥岩夹褐色油页岩沉积并结合地震分析,识别出其优质烃源岩地震相主要呈低频、连续、中弱反射特征,主要沉积方式为滨浅湖和半深湖沉积。在地震相和沉积相分析的基础上,建立了渤中凹陷沙河街组三段优质烃源岩地震相—沉积相模式,确定渤中凹陷沙河街组三段优质烃源岩地震相分布特征。

Based on the seismic data and the fine seismic horizon calibration of the third section of Shahejie formation, the seismic horizon of the third section of Shahejie formation in Bozhong sag was tracked and interpreted. According to the samples taken from the three sections of Shahejie formation in the drilling well, it was found that the seismic facies of the high-quality hydrocarbon source rocks were characterized by low frequency, continuous and moderate and weak reflection. Based on the analysis of seismic facies and sedimentary facies, the seismic facies-sedimentary facies model of high-quality source rocks in the third member of Shahejie formation in Bozhong sag was established, and the distribution characteristics of high-quality source rocks in the third member of Shahejie formation in Bozhong sag were determined.