东濮凹陷下第三系沙三段盐岩和膏盐岩的成因  

Origin of Salt and Gypsum Rock in the Third Member of Shahejie Formation of Lower Tertiary in Dongpu Depression

作　　者：纪友亮[1] 冯建辉[2] 王声朗[2] 谈玉明[2] 张宏安[2] 王德仁[2] 

机构地区：[1]同济大学海洋与地球科学学院,上海200092 [2]中原石油勘探局,河南濮阳457001

出　　处：《沉积学报》2005年第2期225-231,共7页Acta Sedimentologica Sinica

基　　金：国家"937"项目资助(G1999043304);中国叠合盆地层序地层学及构造古地理研究;同济大学行动计划资助项目

摘　　要：在东濮凹陷下第三系沙三段发育暗色泥岩与盐岩和膏盐岩的频繁互层沉积,暗色泥岩为深水成因。根椐盐岩和膏盐岩的沉积序列特点、与盐岩和膏盐岩互层的泥岩和砂岩的沉积特点,沙三段沉积期的古气候和古环境特点,认为盐岩和膏盐岩是浅水蒸发成因的。深水相泥岩与浅水成因的盐岩或膏盐岩频繁互层,说明沙三段沉积时期,湖平面变化频繁。也正是由于湖平面变化频繁,在沉积中心的周围主要物源方向上形成一系列低水位期的砂体。这些低水位期砂体是形成岩性油气藏的主要储层。The column of salt and gypsum rock that are interbeded with black mudstone are developed in 3^rd -4^th sub-member of Shaheje Formation of Lower Tertiary in Dongpu Depression. The black mud-stone was deposited in deep water, and the salt and gypsum have been considered to be deposited in deepwater, too. In recently study, much mark of shallow water origin and evaporation are found, so the salt and gypsum rock is considered of evaporation origin in Shallow water. That the black mudstone deposited in deep water interbedded with salt and gypsum deposited in shallow water shows that during the sedimentation of 3^rd and 4^th sub-member, the lake level changes frequently. And it is because of the frequently change of lake level, lowstand sandbody was deposited in the sedimentation center in the direction of main sediments source, and the lowstand sandbody are the main reservoir of lithic oil pool.

关 键 词：盐岩和膏盐岩成因 湖平面变化 低位期砂体 

分 类 号：P512.2[天文地球—地质学]