东濮盐湖古近系硫酸盐硫同位素组成及地质意义  

Sulfur isotopic composition and its geological significance of the Paleogene sulfate rock deposited in Dongpu Depression

作　　者：史忠生[1] 陈开远[1] 史军[2] 何胡军[2] 柳保军[1] 

机构地区：[1]中国地质大学 [2]中国石化胜利油田地质科学研究院

出　　处：《石油勘探与开发》2004年第6期44-46,共3页Petroleum Exploration and Development

基　　金：中国石化集团勘探先导项目"东濮凹陷盆地发育特征及其油气成藏机制研究"

摘　　要：对东濮凹陷古近系同一层段内和不同层段间硫酸盐硫同位素的研究认为,由于不同时期气候、沉积环境、构造沉降等的变化,东濮凹陷盐湖环境中发育的古近系蒸发岩中的硫同位素具有旋回性,与层序发育的旋回性吻合很好;将东濮凹陷古近系蒸发岩的δ34S值(30‰)与海相蒸发岩的δ34S值相比,结合前人对东濮凹陷古近系蒸发岩锶同位素的研究成果,认为东濮凹陷的湖盆为封闭的陆相盐湖,当时的沉积环境对硫酸盐是封闭的。The sulfur isotopic composition of the Paleogene sulfate rock deposited in Dongpu Depression and the relationship between the sulfur isotopic composition and the sedimentary environment suggest that the δ34S values changed with the climate, sedimentary environment, tectonic subsidence and so on. The sulfur isotopic development matched the sequence development. The comparison between the evaporite δ34 S values of Dongpu Depression and that of marine fades reveals that Dongpu salt-lake was a continental brackish lake and the sedimentary environment was closed to sulfate.

关 键 词：古近系 蒸发岩 东濮凹陷 硫同位素 地质意义 东濮盐湖 沉积环境 湖盆 层序 海相 

分 类 号：TE121[石油与天然气工程—油气勘探] P618[天文地球—矿床学]