Reservoir diagenesis and porosity evolution of the second member of Xujiahe Formation in Suining-Pengxi area
Online published: 2014-02-05
Sandstone of the second member of Xujiahe Formation is an important natural gas reservoir with good exploration prospect in Suining-Pengxi area. The low porosity, low permeability and strong heterogeneity of the sandstone reservoir directly affected the oil and gas exploration and development in this area. Based on slice observation, SEM, inclusion thermometry, vitrinite reflectance and thermal degradeation, this paper systematically studied the types and intensity of diagenesis and porosity evolution of the second member of Xujiahe Fomation. The results show that the sandstone has undergone medium-strong compaction, strong cementation, weak metasomatism and strong corrosion. The reservoir is currently in the middle diagenetic A-B stage and the reservoir was almost completely compacted at middle diagenetic A stage. The pore type is mainly secondary pore. This paper provided geological evidence for favorable reservoir developing area via clear illustration of the process of sandstone reservoir compaction.
WU Yanyan , ZHENG Rongcai , LIANG Xiaowei , LI Fuping , WANG Haihong , HOU Changbing . Reservoir diagenesis and porosity evolution of the second member of Xujiahe Formation in Suining-Pengxi area[J]. Lithologic Reservoirs, 2014 , 26(1) : 58 -66 . DOI: 10.3969/j.issn.1673-8926.2014.01.009
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