Diagenesis of tight sandstones and its controls on reservoirs genesis, Changling Faulted Depression, Songliao Basin

Li Yilong; Jia Ailin; Wu Chaodong

doi:10.11781/sysydz201406698

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Li Yilong, Jia Ailin, Wu Chaodong. Diagenesis of tight sandstones and its controls on reservoirs genesis, Changling Faulted Depression, Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(6): 698-705. doi: 10.11781/sysydz201406698

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Li Yilong, Jia Ailin, Wu Chaodong. Diagenesis of tight sandstones and its controls on reservoirs genesis, Changling Faulted Depression, Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(6): 698-705. doi: 10.11781/sysydz201406698

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Diagenesis of tight sandstones and its controls on reservoirs genesis, Changling Faulted Depression, Songliao Basin

doi: 10.11781/sysydz201406698

Li Yilong^1,2,
Jia Ailin²,
Wu Chaodong^{1,3
,
,}

1.
Institute of Oil and Gas, Peking University, Beijing 100871, China
2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
3. Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China

Received Date: 2013-05-20
Rev Recd Date: 2014-10-10
Publish Date: 2014-11-28

Abstract

Abstract

Based on rock analyses under microscope, organic matter analyses, fluid inclusion data and so on, the diagenesis stages of the Denglouku Formation and the first member of the Quantou Formation in the Changling Faulted Depression have reached the stages A2 and B. The diagenesis sequences of tight sandstones have been determined as followed: (1) Early calcite cement; (2) Albitization of plagioclase and generation of authigenic laumontite; (3) Ⅰ-grade quartz overgrowth; (4) Dissolution of potassium feldspar and generation of authigenic fibrous illite and authigenic chlorite; (5) Ⅱ- and Ⅲ-grade quartz overgrowth; (6) Subtle dissolution of remained potassium feldspar. Strong compaction and early calcite cement resulted in the densification of sandstones. Due to compaction, over 70% of primary pores lost in the sandstone reservoirs buried over 3 000 m deep, which was the main cause for reservoir densification. Secondary pores as a result of feldspar (especially potassium feldspar) corrosion which was controlled by the activity of diagenesis fluid in open system, were the main cause of high-quality reservoirs.
- tight sandstone,
- diagenesis,
- high-quality reservoir,
- Changling Faulted Depression,
- Songliao Basin

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References(29)

References

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Diagenesis of tight sandstones and its controls on reservoirs genesis, Changling Faulted Depression, Songliao Basin

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Diagenesis of tight sandstones and its controls on reservoirs genesis, Changling Faulted Depression, Songliao Basin

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