Distribution Characteristics and Its Controlling Factors of Paleogene Formation Pressure in Zhanhua Sag, Jiyang Depression
详细信息
- 责任者：Yang Xiaomin (School of the Earth and Resources ; China University of Geosciences ; Beijing 100083 ; China)
- 刊名：Journal of China University of Petroleum
- 出版年：2012
- 卷期：36(4)
- 关键词：地层压力 ; formation pressure ; 油气藏形成 ; reservoir formation ; 渤海湾盆地 ; Bohaiwan Basin
- 页码：p.25-31
- 图表：illus., 26 refs.
- 分类号：1003
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
According to the tested and calculated formation pressure data,the distribution pattern of Paleogene formation pressure in Zhanhua sag was investigated.Combining with tectonic,sedimentary and diagenesis information,the controlling factors of formation pressure distribution pattern were researched.The results show that there are vertically three abnormal high pressure systems named as Ed3-Es1,Es3z-x,Es4 systems from the top to down,and the three pressure systems are parted by two pressure-falling zones of Es2-Es3s and upper Es4.Horizontally,the pressure field is divided by faults and uplifts into many pressure centers (sub-field) which are consistent with sedimentary centers.The formation pressure,surplus pressure and pressure coefficient reduce from center to margin.The distribution pattern of formation pressure is controlled by tectonic,sedimentary and diagenesis processes.The tectonic pattern determines the station of formation pressure centers,and the pressure system is divided by faults pressure-falling action.The property of sedimentary materials determines the depth of abnormal pressure,which is related with deposition velocity.With the deposition velocity exceeding 220 m/Ma,the abnormal high pressure could appear.The abnormal pressure produced by incompaction is direct ratio to deposition velocity.Contribution of hydrocarbon generation to the abnormal high pressure results in the distribution consistent of abnormal pressure with source rocks.Translation of some minerals such as montmorillonite and illite could induce abnormal pressure in specifically depth.