Sedimentary characteristics and genesis of lateral accretion packages in the Pliocene of Dongfang area of Yinggehai Basin
Zhuo Haiteng1, Wang Yingmin1, Xu Qiang2, Li Dong2, Wang Yongfeng3, Zhou Chuan4
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249
2 CNOOC Research Institute,Beijing 100027
3 Sinopec Management Institute,Beijing 100012
4 PetroChina Dagang Oilfield Company,Cangzhou 061035,Hebei
Based on the interpretation of seismic profiles，slices and attributes，lateral accretion packages(LAPs) were found in Dongfang 1-1 area of the Yinggehai Basin in northern South China Sea. According to their sinuosity，LAPs can be categorized into high or low sinuous types，which are both characterized by a series of shingled reflections on seismic profiles. However，in the plan view，the high sinuous type is represented by a scrollbar pattern while the low sinuous type is ribbonlike.The LAPs are suggested to be formed by multiple stages of “cut-fill” as well as the subsequent lateral migration. The lower part of LAPs are consisted of coarsegrained reservoir resulting from the amalgamation of channel axis bottom deposits，which have good lateral connectivity and reservoir potential.However，it turns upwards into the combination of sandstones interbeded with mudstones，leading to a low lateral connectivity and quality.The discovery of the LAPs is significant to understand the nature of the deepwater gravityflow systems and also provides potential targets for the hydrocarbon exploration in the study area.
Zhuo Haiteng,Wang Yingmin,Xu Qiang et al. Sedimentary characteristics and genesis of lateral accretion packages in the Pliocene of Dongfang area of Yinggehai Basin[J]. JOPC, 2013, 15(6): 787-794.
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