摘要
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。
Very thick salt rocks are developed in the Puwei subdepression of the Dongpu depression.To ascertain their development pattern and genesis is of great significance for the study of the regional geology and oil and gas exploration.Using the basic theory and method of high-resolution sequence stratigraphy,on the basis of an integrated analysis of the cores,logs and seismic data,combined with an analysis of the basin structure and stratigraphy,seven salt rhythmic successions are recognized in the Paleogene Shahejie Formation in the study area,of which3are of the first order and4are of the second order.The development and distribution pattern of each salt rhythmic succession is analyzed.Geochemical and paleontological analyses indicate that the Eocene climate in the area had high-frequency dry-moist change,that the source of salt rocks was mainly seawater in the marine flooding period,and that salt rocks in the high-frequency sequences formed by evaporation of water at depths during the dry lowstand phase.
出处
《中国地质》
CAS
CSCD
2003年第3期309-314,共6页
Geology in China
基金
中原油田分公司采油二厂与西北大学横向合作科研项目。
关键词
盐韵律组
盐岩成因
海泛
低水位
濮卫洼陷
Puwei subdepression
salt rhythmic succession
genesis of salt rock
marine flooding
lowstandGu Jiayu.The depositional environment of salt rocks in Dongpu depression
