论文部分内容阅读
对民丰洼陷沙三中亚段进行了物源体系的研究表明,变质岩、花岗伟晶岩、中基性的喷出岩、基性-超基性侵入岩和沉积岩为主要的母岩类型。研究区存在北、东、南3个主要物源区,其重矿物组合、特征元素比值、岩石组分等方面存在明显的差异,分别形成了北部的近岸水下扇体系、东部的永安镇三角洲和南部的东营三角洲。随着地层由老变新,东部和南部的沉积边界向盆地进积,而北部物源逐渐萎缩。3个物源区的交汇处为浊积岩的有利探区。
The study on the provenance system of the Middle Third Member of the Middle Third Member of the Minfeng Sag shows that metamorphic rocks, granitic pegmatites, medium-basic extrusive rocks, basic-ultrabasic intrusive rocks and sedimentary rocks are the main mother Rock type. There are three major source areas in North, East and South of the study area. There are obvious differences in heavy mineral assemblage, characteristic element ratio, rock composition and so on, forming the inshore submarine fan system in the north, Yong’an Town in the east Delta and southern Dongying Delta. As the strata change from old to new, the eastern and southern sedimentary boundaries plunge into the basin, while the northern source gradually shrinks. The confluence of 3 source areas is the favorable exploration area for turbidites.