Characteristics and Genetic Mechanism of Low-Permeability Reservoirs of the 4th Member of Shahejie Formation in Hexiwu Structural Zone of Langgu Sag
详细信息
- 责任者：Zhou Lei (School of Geosciences ; China University of Petroleum ; Qingdao 266580 ; China) ; Cao Yingchang
- 刊名：Journal of China University of Petroleum
- 出版年：2013
- 卷期：37(3)
- 关键词：低渗透储集层 ; low permeability reservoirs ; 冀中坳陷 ; Jizhong Depression
- 页码：p.8-16
- 图表：illus., 1 table, 16 refs.
- 分类号：1003
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
Based on the data of thin section observation,geophysical property test,mercury injection test and fluid-inclusion temperature test,the characteristics and genetic mechanism of low-permeability reservoirs of the fourth member of Shahejie formation(Es4) in Hexiwu structural zone of Langgu sag were studied by using the inversion method of the reservoirs porosity and permeability during the geological history.The results show that there are low porosity and extremely-low permeability reservoirs in Es4 of Hexiwu structural zone.The sedimentary difference,which leads to different primary geophysical properties because of different material composition,grain size and sort,is the primary cause of low permeability.The diagenesis is the vital cause of low permeability.The rapid burial in early diagenetic stage,the cementation in later diagenetic stage and the lack of effective mechanism for increasing porosity and protecting pores form the low-permeability reservoirs finally.The method for inversion of the reservoirs geophysical property during the geological history can rebuild the evolutionary process of porosity and permeability.
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