Sedimentary features,genesis and relation to hydrocarbon of fan-anticline in the North Slope of the Dongying Sag
Zhong Jianhua1, Wang Guozhuang2, Gao Xiangcheng1, Xia Jingsheng1, Wang Hongbao3, Wang Zhikun1, Chen Zhipeng1
1. College of Earth Resources and Information, China University of Petroleum, Dongying, Shandong 257061; 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640; 3. Dongxin Production Factory, Shengli Oilfield Branch Company, China Petroleum and Chemical Corp., Dongying, Shandong 257068
The Dongying Sag is one of the most conspicuous petroleum generative depressions in East China.Much clastic deposit of glutenite accumulated and became an important place of hydrocarbon accumulation in the 3rd and 4th Members,Shahejie Formation in the North Slope of the Dongying Sag.Many fan-anticlines composed of sediments of the 3rd and 4th Member developed along the steep slope of the North Slope.Fan-anticline,as a sedimentogenic one,was different from general structural anticline.When glutenite accumulated and was covered by seal,the fan-anticlines were built up.Although the drape anticline is also a sedimentary one,it is different from fan-anticline in many respects.There are 3 genetic types of fan-anticline mainly,including,overriding of turbidite fan,near bank subaquatic fan and fan formed by differential compaction of glutenite.In the Well Fengshen 1,the drape trap was based on bossy basement,which lies in the middle part of the North Slope of the Dongying Sag.The drilling revealed that the fan-anticline reservoir was a kind of lithologic reservoir,controlled by the distance and connectedness between glutenite and oil sources,and the shut off capacity of seals.Most of these fan-anticline reservoirs occurred in region of steep slope belt in downfaulted lacustrine basin.
Zhong Jianhua,Wang Guozhuang,Gao Xiangcheng et al. Sedimentary features,genesis and relation to hydrocarbon of fan-anticline in the North Slope of the Dongying Sag[J]. Chinese Journal of Geology, 2008, 43(4): 625-636.