Diagenetic evolution characteristics of Paleogene lacustrine carbonate reservoirs in the central Bohai Sea area

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  • 1.College of Energy,Chengdu University of Technology,Chengdu 610059,China;
    2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610059,China;
    3.Tarim Oilfield Company,PetroChina,Korla 841000,China

Received date: 2017-11-19

  Revised date: 2018-05-14

  Online published: 2019-08-28

Abstract

High-quality reservoirs' distribution in the Shahejie Formation of the Shijiutuo Uplift in the central part of the Bohai Sea is a key factor in determining the distribution of oil and gas reservoirs,and the formation of rocks is a key factor in controlling the development of the lacustrine carbonate reservoirs.Accurate analysis of diagenesis is an important guarantee for improving the reservoir prediction of the Shahejie Formation.The experimental analysis techniques such as polarized light microscopy,fluorescence microscopy,scanning electron microscopy,cathodoluminescence,and electron probes were used to determine reservoir characteristics and diagenetic evolution sequences.The diagenetic stage was determined using X-ray diffraction of clay minerals.The period of formation of carbonate authigenic minerals was analyzed using gas-liquid two-phase inclusion homogenization temperature and oxygen isotope geological thermometers.Bioclastic dolostone is the main rock type in Shahejie Formation and the doloarenite is the minor;Reservoir space is dominated by residual primary intergranular pores and visceral cavity pores;The authigenic dolomites with different occurrences and different stages are the critical character of diagenesis.Diagenetic evolution sequence is established and the latest diagenetic period is the phase B of the middle diagenetic stage.The pore-lining dolomites of the early diagenetic stage and the coating dolomites of the syndiagenetic stage which reduce the destruction strength of the mechanical compaction to the porosity are the most effective products of the diagenesis.

Cite this article

Lü Zheng-xiang, Wang Xian-dong, Wu Jia-yang, Qing Yuan-hua . Diagenetic evolution characteristics of Paleogene lacustrine carbonate reservoirs in the central Bohai Sea area[J]. Natural Gas Geoscience, 2018 , 29(7) : 921 -931 . DOI: 10.11764/j.issn.1672-1926.2018.05.005

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