Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (3): 669-679.doi: 10.13278/j.cnki.jjuese.20200149

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Origin Mechanism of Chlorite and Its Impact on Reservoir Properties in Huagang Formation, Xihu Depression

Huang Xin, Duan Dongping, Liu Binbin, Li Bingying, Ding Fang, Wang Wei, Lou Min   

  1. Shanghai Branch of CNOOC Ltd, Shanghai 200335, China
  • Received:2020-06-23 Online:2021-05-26 Published:2021-06-07
  • Supported by:
    Supported by the National Science and Technology Major Projects of China (2016ZX05027-004) and the National Natural Science Foundation of China (41672129,41602135)

Abstract: In the context of low-permeability reservoirs in the Huagang Formation in the Xihu depression, high quality reservoirs are often associated with the enrichment of chlorite. There are three different types of chlorites: Clay coating chlorite, pore-lining chlorite, and pore-filling chlorite. The clay coating chlorites with complex composition were formed in the syn-sedimentary stage through flocculation and adsorption of Fe and Mg. The pore-lining chlorites are the most common type:Among them,type I pore-lining chlorites were formed by recrystallization of clay coating chlorites during early compaction period, and the monocrystals are subhedral platelets with low Fe and Mg content and disorderly arrangement; Type Ⅱ pore-lining chlorites were formed by crystallization of pore fluid on clean grain surface, and the monocrystals are euhedral hexagonal platelets with higher Fe and Mg content and mainly arranged orderly on the surface of vertical particles. The pore-filling chlorites are in dispersive flake, booklet, and pompon aggregation, which are closely related to dissolution with the highest euhedral crystals and highest Fe and Mg content. The clay coating chlorites have little effect on reservoir physical properties, but can help the formation of pore-lining chlorites; The pore-lining chlorites are difficult to alleviate compaction, but can inhibit pressure solution and early quartz overgrowth to a certain extent. Type I-pore-lining chlorites are characterized by good continuity, disorderly arrangement, poor crystallization, and complex intergranular pores, and have obvious inhibition on quartz cementation, but type Ⅱ-pore-lining chlorites have limited inhibition on quartz cementation; The pore-filling chlorites only fill larger primary intergranular pores and intergranular dissolved pores, which have little effect on permeability and only reduce porosity to a certain extent. The physical properties of reservoirs are mainly controlled by the original sedimentary structure of reservoir sandstone and the transformation process of corresponding compaction and dissolution strength; And the chlorite enrichment plays an indicative role in high-quality reservoirs.

Key words: Xihu depression, Huagang Formation, chlorite, origin mechanism, pore structure

CLC Number: 

  • TE122.2
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