Quantitative classification and characteristic difference of diagenetic facies in He 8 reservoir of the Su 48 block,west area of Sulige Gas Field,Ordos Basin

Bai Yun-yun, Sun Wei, Ren Da-zhong, Han Jin

doi:10.11764/j.issn.1672-1926.2018.08.002

2018 , Vol. 29 >Issue 12: 1739 - 1747

DOI: https://doi.org/10.11764/j.issn.1672-1926.2018.08.002

Quantitative classification and characteristic difference of diagenetic facies in He 8 reservoir of the Su 48 block,west area of Sulige Gas Field,Ordos Basin

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1.Department of Geology,Northwest University,Xi’an 710069,China； 2.College of Chemistry and Chemical Engineering,Yulin College,Yulin 719000，China； 3.College of Petroleum Engineering，Xi’an Shiyou University,Xi’an 710065,China

Received date: 2018-07-05

Revised date: 2018-08-18

Online published: 2019-01-14

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Abstract

The He 8 reservoir of Shihezi Formation in the Su 48 block of the west area of Sulige Gas Field of Ordos Basin belongs to braided river delta plain sedimentary subfacies.The development of reservoir is difficult because of the strong heterogeneity.This paper is based on the knowledge of oil and gas reservoir geology,sedimentology,etc.The quantitative characterization of diagenetic effects on pore densification were studied by conducting various experiments including cast thin section,cathode luminescence,image particle size,X-ray diffraction,scanning electron microscope.The quantitative classification standard for diagenetic faciesis established by diagenetic,physical and pore parameters,and the differences in characteristics of different diagenetic facies are described.The study shows that the study area belongs to ultra-low porosity and ultra-low permeability oilfield mainly composed of lithic quartz sandstone and quartz sandstone.The qualitative characteristics of diagenesis indicate that the study area is mainly in the middle diagenetic stage B.Mechanical compaction is the main controlling factor for reservoir densification under a series of diagenetic evolutions such as compaction-early cementation-dissolution-late cementation.Four types of diagenetic faciescan be classified according to the diagenetic parameters.The moderate compaction,quartz weakening,intergranular pore,and dissolution pore facies are distributing in the middle of the diversion channel,belonging to high-quality diagenetic facies.Followed by the moderate compaction,moderate kaolinite cementation,dissolution phase,and intercrystalline hole.The mechanism of ultra-low porosity in study area has been clarified and it can provide a reference for advanced description of micro-pore of Sulige Gas Field.

Key words： Sulige Gas Field; Diagenetic evolution; Pore quantification; Compaction; Diagenetic facies

Cite this article

Bai Yun-yun, Sun Wei, Ren Da-zhong, Han Jin . Quantitative classification and characteristic difference of diagenetic facies in He 8 reservoir of the Su 48 block,west area of Sulige Gas Field,Ordos Basin[J]. Natural Gas Geoscience, 2018 , 29(12) : 1739 -1747 . DOI: 10.11764/j.issn.1672-1926.2018.08.002

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