渤海湾盆地A油田沙一、沙二段混合沉积模式

从岩石学特征入手,结合古地貌及沉积动力学分析,对渤海湾盆地A油田沙一、沙二段混合沉积模式进行分析,结果表明,A油田沙一、沙二段主要发育扇三角洲沉积,同时发育鲕粒滩、生物碎屑滩、碎屑滩和混积滩,同时期存在的多种沉积相类型是形成混合沉积的环境条件。根据岩性组合特点及空间分布规律,对研究区混合沉积类型细分为四类:相突变混合沉积、相过渡带混合沉积、以碎屑岩相为主的混合沉积和以碳酸盐岩相混合沉积四种类型,其中以碎屑岩相为主的混合沉积和以碳酸盐岩相为主的混合沉积是研究区主要的混合沉积类型。

Mixed sedimentary patterns of Sha1 and Sha2 members in A oilfield of Bohai bay basin

Starting from the petrological characteristics and combining with the analysis of paleogeomorphology and sedimentary dynamics, the mixed sedimentary patterns of Sha1 and Sha2 members in A oilfield in Bohai bay basin were analyzed. The results show that the fan delta deposits are mainly developed in Sha1 and Sha2 members of oilfield A, and oolitic shoal, bioclastic shoal, clastic shoal and mixed shoals are also developed. Many sedimentary facies types existed at the same time are the environmental conditions for the formation of mixed deposition. According to the characteristics of lithologic association and spatial distribution, the mixed sedimentary patterns in the study area are divided into four types, namely, facies mutation mixed deposition, facies transition zone mixed deposition, mixed deposition dominated by clastic facies and mixed deposition dominated by carbonate facies, among which the mixed deposition dominated by clastic facies and the mixed deposition dominated by carbonate facies are the main mixed sedimentary types in the study area.