Characteristics and origin of abnormally high porosity zones in buried Paleogene clastic reservoirs in the Shengtuo area, Dongying Sag, East China
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- 作者：Yingchang Cao (1)
Guanghui Yuan (1)
Xiaoyan Li (1)
Yanzhong Wang (1)
Kelai Xi (1)
Xiaoming Wang (1)
Zhenzhen Jia (1)
Tian Yang (1) - 关键词：Dongying Sag ; Shengtuo area ; abnormally high porosity zone ; pores ; genesis
- 刊名：Petroleum Science
- 出版年：2014
- 出版时间：September 2014
- 年：2014
- 卷：11
- 期：3
- 页码：346-362
- 全文大小：1,595 KB
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Guanghui Yuan (1)
Xiaoyan Li (1)
Yanzhong Wang (1)
Kelai Xi (1)
Xiaoming Wang (1)
Zhenzhen Jia (1)
Tian Yang (1)
1. School of Geosciences, China University of Petroleum, Qingdao, Shandong, 266580, China - ISSN：1995-8226
文摘
There are three abnormally high porosity zones developed in buried Paleogene nearshore subaqueous fan and sublacustrine fan clastic reservoirs at 2,800-,200 m, 3,250-,700 m and 3,900-,400 m, respectively, within the Shengtuo area of the Dongying Sag. Here the porosity of reservoirs buried deeper than 4,000 m can still be greater than 20%. Investigation of these three abnormally high porosity (AHP) zones in the 3rd to 4th member of the Paleogene Shahejie Formation in the Shengtuo area was carried out with utilization of core observation, thin section identification, SEM observation, image analysis, core physical property testing and other technical methods. The results show that, the AHP zones in 2,800-,200 m and 3,250-,700 m are visible pores primary AHP zones dominated by significant primary intergranular pores (more than 50% of the total porosity), while secondary pores and micropores in authigenic clays may develop in some reservoirs. AHP reservoirs in the AHP zone of 3,900-,400 m are dominated by micropores in matrix, visible pores are mainly grain dissolution pores but with low absolute content (