line-level: 2" class=MsoNormal>Mechanism of Generating Abnormal Overpressure and Its Influences on Super-Low Permeability Reservoirs for
详细信息
- 责任者：Zhao Zhenyu (Research Institute of Petroleum Exploration & Development ; PetroChina ; Beijing 100083 ; China) ; Gu Jiayu
- 刊名：Journal of China University of Petroleum
- 出版年：2010
- 卷期：34(5)
- 关键词：低渗透储集层 ; low permeability reservoirs ; 超压 ; overpressure ; 济阳坳陷 ; Jiyang Depression
- 页码：p.12-17,24
- 图表：4 illus., 1 table, 19 refs.
- 分类号：1003
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
By means of analyzing sedimentary microfacies,structure features,diagenesis,porosity and permeability and geochemical testing data,the mechanisms of generating abnormal overpressure and its influences on super-low permeability reservoir of upper Es4member in Chexi depression were discussed detailedly. The results show that the principal mechanism of generating abnormal overpressure is disequilibrium compaction,and the secondary is mineral diagenesis. The formation temperature increasing and diagenesis deepening with depth are inhibited by abnormal overpressure. In the abnormal overpressure section,secondary porosity is relatively well preserved,which is a favourable condition for oil and gas exploration and development. In argillaceous sandstone-based super-low permeability reservoir,it is not a linear relationship between oil and gas production capacity and formation pressure coefficient,as a higher capacity corresponds to the pressure coefficient of 1. 2 1. 3. This phenomenon results from single sand body thickness ( sand-mud ratio) ,physical parameters,oil saturation and pressure sensitivity and so on.
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