摘要
东濮凹陷沙三段高水位期沉积深灰色、暗色泥岩与少量重力流砂体,低水位期沉积盐岩、膏岩、低位三角洲与扇三角洲,从而形成纵向上深湖泥岩与蒸发岩、低位砂岩的频繁互层沉积。根据岩心资料、盐岩沉积序列特点及沙三段沉积期古气候和古环境特点,认为盐岩为浅水蒸发成因。深水相泥岩与浅水成因的盐岩频繁互层,说明沙三段沉积期湖平面变化频繁。基于盐韵律特征划分准层序的方法,使得层序地层划分更为符合东濮凹陷含盐地层的实际情况。
In the highstand period of the third section of Shahejie Formation in Dongpu Depression, dark grey and dark mudstone and a few gravity flow sandbodies were deposited. And salt rock, gypsum rock, lowstand deltas and fan deltas were developed in the lowstand period. As a result, deep lacustrine facies mudstone is interbeded with evaporite and lowstand sandstone in vertical. According to the core data, characteristics of sedimentary sequence of salt rock, palaeoclimate and palaeoenvironment of depositional stage, this paper indicates that the origin of salt rock is because of shallow water evaporation. The dark mudstone deposited in deep water was interbedded with the salt rock deposited in shallow water, which showed that the lacustrine level changed frequently during the sedimentation of the third section of Shahejie Formation. Based on the method Of parasequences identification with the salt rhythm characteristics, the sequence division accords with the practice in salt formation in Dongpu Depression.
出处
《断块油气田》
CAS
北大核心
2009年第2期9-11,共3页
Fault-Block Oil & Gas Field
基金
国家973项目“中国叠合盆地层序地层学及构造古地理研究”(G1999043304)资助
关键词
东濮凹陷
浅水成盐
含盐地层
盐韵律
含盐地层层序
Dongpu Depression, salt rock deposited in shallow water, salt formation, salt rhythm, salt stratigraphic sequence.
