Origin of Salt and Gypsum Rock in the ThirdMember of Shahejie Formation of Lower Tertiary in Dongpu Depression
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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。Abstract: The column of salt and gyp sum rock that are interbeded with black mudstone are developed in 3rd - 4thsub-member of Shaheje Formation of Lower Tertiary in Dongpu Dep ression. The black mud-stone was deposited in deep water, and the salt and gyp sum 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 gyp sum rock is considered of evaporation origin in Shallow water. That the black mudstone deposited in deep water interbedded with salt and gyp sum deposited in shallow water shows that during the sedimentation of 3th and 4th sub-member, the lake 1evel changes frequently.And it is because of the frequently change of lake 1evel, lowstand sandbodywas deposited in the sedimentation center in the direction of main sediments source, and the lowstand sandbody are the main reservoir of lithic oil pool
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Key words:
- origin of salt and gyp sum rock /
- lake level change /
- lowstand sandbody
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