Distribution of Top of Paleogene Overpressure System and Its Influencing Factors in Dongying Depression, Jiyang Basin, East China
详细信息
- 责任者：Zha Ming (School of Geosciences ; China University of Petroleum ; Qingdao 266580 ; China) ; Wang Xudong
- 刊名：Journal of China University of Petroleum
- 出版年：2012
- 卷期：36(3)
- 关键词：超压 ; overpressure ; 油气勘探 ; petroleum exploration ; 东营凹陷 ; Dongying Sag
- 页码：p.20-25
- 图表：illus., 1 table, 20 refs.
- 分类号：1003
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
Pressure measurement and logging response analysis are two common methods used to study the top of overpressure (TOO) in petroleum industry.Due to the more reliable theory basis,the latter was used to analyze the distribution and influencing factors of the Paleogene TOO in Dongying Depression, Jiyang Basin.The results show that the Paleogene TOO is mainly restricted within the thick mudstones in the middle part of the third member of Shahejie Formation and corresponds to the interval between T4 and T6 reflecting interfaces in seismic sequences,which suggests the feature of strata-controlled.The burial depth of this TOO ranges from 2.4 km to 2.8 km and shallows from the central to the margin.Sedimentary rocks below the TOO are composed of dark grey mudstone,calcareous mudstone and sandy mudstone.The horizontal distribution of TOO is partly controlled by lithology and deposition rate of underlying argillaceous rock,while tectonic uplift and denudation,faulting movement as well as salt diapirsm are the primary causes of the shallowing of the TOO in certain areas.
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