埕岛东斜坡水下扇沉积特征

doi:10.11743/ogg20030209

Oil & Gas Geology ›› 2003, Vol. 24 ›› Issue (2): 146-151.doi: 10.11743/ogg20030209

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STUDY OF SEDIMENTARY CHARACTERISTICS OF SUBAQUEOUS FAN IN EASTERN SLOPE OF CHENGDAO

Yuan Xiangchun^1,2, Zhong Jianhua³, Gao Xilong⁴, Sun Xirui⁴, Li Zhaoyan ⁴

1. Guangzhou Institute of Geochemisitry, Chinese Academy of Sciences, Guangzhou, Guangdong;
2. Exploration & Production Research Institute, SINOPEC, Beijing;
3. Geo-Resources and Information College, Petroleum University, Dongying, Shandong;
4. Offshore Petroleum Development Company, Shengli Oilfield, SINOPEC, Dongying, Shandong

Received:2002-08-06 Online:2003-06-25 Published:2012-01-16

Abstract

Abstract:

Sand body in the 3rd member of Dongying Fm in eastern slope of Chengdao is controlled by subaqueous channel,with subaqueous fan to be characterized by both traction and turbidity current sediments. The petrographic facies include hybrid matrix-supported gravelly sandstone, pebbled sandstone, argillaceous-supported sandstone and sandy siltstone,which are mainly characterized by coarse-grained sediments. Depositional beddings such as graded bedding,massive bedding,parallel bedding, cross-bedding and wave bedding,are well developed;and depositional structures including slump,convolute and load-dehydration,are also developed very well.Obvious channel downcutting has been recognized in the seismic profiles,which appears as wide semi-lens—being flat on the top and being slightly convex at the bottom;and the spontaneous potential log shows positive rhythm,with columnar and box-like shapes changing respectively from high amplitude to medium amplitude,which are closely related to different lithology and different depositional facies.On the basis of lithology, and electric and reservoir property analyses,depositional facies in this area can be divided into 7 micro-facies,including subaqueous channel,interchannel unconcentrated flow, interchannel splay, subaqueous levee,interchannel mudflat, river mouth lobe and sheet sand microfacies.

Key words: subaqueous fan, gravity current, traction current, eastern slope of Chengdao

CLC Number:

P512.2

Yuan Xiangchun, Zhong Jianhua, Gao Xilong, Sun Xirui, Li Zhaoyan. STUDY OF SEDIMENTARY CHARACTERISTICS OF SUBAQUEOUS FAN IN EASTERN SLOPE OF CHENGDAO[J]. Oil & Gas Geology, 2003, 24(2): 146-151.

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STUDY OF SEDIMENTARY CHARACTERISTICS OF SUBAQUEOUS FAN IN EASTERN SLOPE OF CHENGDAO

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