Quantitative analysis of porosity evolution and formation mechanism of good reservoir in Enping Formation,Baiyun Sag,Pearl River Mouth Basin

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  • 1.Key Laboratory of Petroleum Resources,Gansu Province/ Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.CNOOC Research Institute,Beijing 100027,China;
    3.University of Chinese Academy of Sciences,Beijing 100049,China

Received date: 2017-04-19

  Revised date: 2017-07-14

  Online published: 2019-04-16

Abstract

This paper has applied thin sections,casting thin sections,fluorescence thin sections,X-ray fluorescence,scanning electron microscope,mercury porosimetry measurements,oxygen and carbon isotope characteristics to analyze the petrologic features,physical properties,pore structure characteristics and the effect of diagenesis on reservoir quality of sandstone reservoir from Enping Formation in Baiyun Sag,Pearl River Mouth Basin.Then demonstrate formation mechanism of relatively good reservoir.The results showed that reservoir sandstones are classified as litharenite.Detrital grains are grain-supported and cemented by authigenic quartz,ferrocalcite and clay minerals.Pores are mainly intragranular dissolved pore from feldspar and feldspar-bearing volcanic debris,some intergranular dissolved pores,the secondary porosity zones can be found near the coal bed.Reservoir properties in general have low porosity and permeability,compaction is the main reason for the loss of intergranular pores in the burial history.During mechanic compaction,the loss rate of porosity of the sandstone is 12.51%-29.6% in the study area,with an average of 23.99%,which were taking 33.53%-79.34% of the initial porosity and the average value is 64.30%,the strength of the compaction decrease porosity is 39.20%-91.05% with a high average value of 81.17%;The bad reservoir quality of the calcareous sandstone bed results from the mid-late cementation.During cementation,the loss rate of porosity is 2.91%-19.40% with an average of 5.61%,the strength of the cementation decrease porosity is 8.95%-60.80% and the average value is 18.83%;The formation of secondary porosity is caused by the organic acid.Organic maturity and acidic water in which CO2 is released by decarboxylation of organic matter in the process of diagenesis were the main reason.The feldspar particles and feldspar-bearing volcanic debris are dissolved by organic acid.The proportion of secondary porosity takes up to 3.19%-8.54% with an average of 5.66%,which were taking 59%-90% of the total porosity and the average value is 76%.

Cite this article

Ma Ming, Chen Guo-jun, Li Chao, Zhang Gong-cheng, Yan Ying-kai, Zhao Zhao, Shen Huai-lei . Quantitative analysis of porosity evolution and formation mechanism of good reservoir in Enping Formation,Baiyun Sag,Pearl River Mouth Basin[J]. Natural Gas Geoscience, 2017 , 28(10) : 1515 -1526 . DOI: 10.11764/j.issn.1672-1926.2017.07.018

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