末端扇—滨浅湖滩坝组合沉积机制与演化分布:以东濮凹陷卫城油田沙河街组四段为例

doi:10.13278/j.cnki.jjuese.20180275

Abstract

Abstract: The accurate description to sedimentary facies and its evolution of the complicated depositional environment can effectively guide the oil and gas field exploration and exploitation. Combined with the regional background of Weicheng structure in Dongpu depression, the depositional features and sedimentary model of the 4th member of Shahejie Formation (Es₄) in Wei 81 block of Weicheng oildfield were analyzed by use of the data of core description, logging, analysis and test, etc. It is considered that the associated sediments of terminal fan to beach-bar in shore-shallow lake are developed in the study formation of this block. The terminal fan was developed in the background of energy loss and flow fluctuation at the end of the rivers in the lower part of Es₄, and the distributary channel evolved into overflow or mudflat along the source direction,thus forming the fan-shape accumulation; with the change of sedimentary environment under the frequent expansion or shrink of the lake level, the beach-bar sediments in shore-shallow were developed in Es₄, paralleling to the trend of master fault with composite form.

Key words: associated deposits of terminal fan to beach-bar, sedimentary model, depositional evolution, sand distribution, Weicheng oilfield, Dongpu depression

CLC Number:

Li Weilu, Gao Siyu, Zhang Yi, Zhang Jinliang, Han Chunhua. Sedimentary Mechanism, Evolution and Distribution of Terminal Fan to Beach-Bar in Shore-Shallow Lake Sediments: A Case Study of 4th Member of Shahejie Formation in Weicheng Oildfield, Dongpu Depression[J].Journal of Jilin University(Earth Science Edition), 2020, 50(1): 31-40.

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Sedimentary Mechanism, Evolution and Distribution of Terminal Fan to Beach-Bar in Shore-Shallow Lake Sediments: A Case Study of 4th Member of Shahejie Formation in Weicheng Oildfield, Dongpu Depression

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