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东濮凹陷濮卫洼陷发育巨厚的盐岩沉积,搞清其发育规律和成因对区域地质研究及油气勘探具有重要意义。笔者以高分辨率层序地层学的基本理论和方法为指导,通过对钻井岩芯、测井和地震资料的综合分析,结合盆地结构和地层分析,在研究区古近系沙河街组划分出7个盐韵律组,其中Ⅰ级3个,Ⅱ级4个,分析了各个盐韵律组的发育及分布规律。地球化学及古生物分析表明,研究区古近纪古气候具干旱与潮湿的高频变化,盐岩的物源主要为海泛的海水,盐岩在高频层序中为低水位干旱期深水处蒸发成因。
The development of thick salt rock deposits in the Puwei Sag of Dongpu Depression is of great significance for the study of regional geology and oil and gas exploration. Guided by the basic theories and methods of high-resolution sequence stratigraphy, through comprehensive analysis of drilling core, well logging and seismic data, combined with basin structure and stratigraphic analysis, the author draws a conclusion in the Shahejie Formation of Paleogene in the study area There were 7 salt prosody groups, of which 3 were grade Ⅰ and 4 were grade Ⅱ. The development and distribution of each salt rhythm group were analyzed. Geochemical and palaeontological analyzes show that the Paleogene paleoclimate has a high frequency of drought and dampness in the study area. The source rocks of the salt rocks are mainly sea-water, and the salt rocks are deep water areas with low water level during the high-frequency sequence Evaporation causes.