Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (4): 973-990.doi: 10.13278/j.cnki.jjuese.20200182

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Genesis Mechanism of Authigenic Minerals in Deep Clastic Rocks and Its Influence on Reservoir Physical Property: An Example from the Jurassic in Qinan Fault Step Belt, Bohai Sea, China

Guo Ying, Yang Bo, Han Zijun, Li Guoying, Wu Qingxun, Ye Tao   

  1. Tianjin Branch, CNOOC China Limited, Tianjin 300459, China
  • Received:2020-08-06 Online:2021-07-26 Published:2021-08-02
  • Supported by:
    Supported by the National Science and Technology Major Project (2016ZX05024-003)

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Abstract: The characteristics and genetic mechanism of authigenic mineralshave important influence on the physical properties of deep clastic rock reservoirs. By taking the Jurassic clastic reservoirsin Qinan fault step belt of Qikou sag, offshore Bohai Sea as anexample, the types, characteristics, genetic mechanism of authigenic minerals, and their controlling effect on the development of high-quality reservoirs were studied on the basis of core observation, thin section identification, scanning electron microscope, electron probe, isotope, inclusion, and X-diffraction analyses. The results show that the Jurassic clastic reservoirs in the study area have moderate porosity and low permeability with strong heterogeneity. The main types of authigenic minerals are siliceous minerals, carbonate minerals, and clay minerals. The early microcrystalline quartz liners are distributed along the surface of the particles that effectively inhibited the overgrowth of late quartz and enhanced the resistance to compactionof the rock, which was beneficial to the preservation of primary pores; The early carbonate cementation enhanced the anti-compaction ability of the reservoirs, and provided the material foundation for the formation of dissolution pores generated by the late dissolution, which was conducive to the formation of high-porosity reservoirs; The clay minerals controlled the difference in reservoir permeability, which is positively correlated with the content of authigenic kaolinite. The reservoirs with higher permeability are distributed in the kaolinite enrichment zone in the middle part of the Jurassic. Two types of favorable reservoirs are developed in the study area:Type Ⅰ is with high content primary poresand well-developed microcrystalline quartz gaskets; Type Ⅱ is with more developed intergranular dissolution pores and more obvious epidiagenesis characteristics, and they are significantly different in pore evolution. Type Ⅰis mainly controlled by the compaction resistance of the microcrystalline quartz liners in the early to middle diagenesis stage, and the high-porosity reservoirs can be developed in both shallow and deep layers; Type Ⅱ is mainly controlled by the weathering and leaching in the supergene stage, and high-quality reservoirs can be formed near the weathering crust. Type Ⅰ reservoir has better physical properties than type Ⅱ.

Key words: authigenic minerals, genesis mechanism, reservoir physical property, Qinan fault step belt, Jurassic, deep clastic

CLC Number: 

  • P544
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