Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1235-1246.doi: 10.13278/j.cnki.jjuese.20180094

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Kaolinite Cementation and Its Influences on Reservoir Properties in CFD18-2 Oilfield in Bozhong Sag

Chen Sirui1, Qu Xiyu1, Wang Guanmin1, Wang Qingbin2, Cao Yingquan1   

  1. 1. College of Geoscience, China University of Petroleum, Qingdao 266580, Shandong, China;
    2. Tianjin Branch of CNOOC, Tianjin 300459, China
  • Received:2018-05-05 Published:2019-10-10
  • Supported by:
    Supported by National Science and Technology Major Project (2016ZX05024-003-006) and Fundamental Research Funds for the Central University (12CX04004A)

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Abstract: Kaolinite is a common aluminum-rich silicate clay mineral in sandstone reservoirs. It usually fills in the pore-throat of reservoirs. Its appearance generally indicates the dissolution of feldspars and the formation of secondary pores. The authors studied the characteristics, types, origin of the kaolinite through analyzing the data of polarizing microscope, scanning electron microscope, and the physical properties of the reservoir in the third member of Dongying Formation (Ed3) of CFD18-2 oil field in the southeastern part of Shaleitian uplift in Bozhong Sag. The results reveal that:1) The kaolinite of the study area is authigenic kaolinite formed by feldspar dissolution by organic acid. The authigenic kaolinite shows typical "accordion" and "worm" shapes, and is often filled in intergranular pores, feldspar secondary dissolution pores, and carbonate cement dissolution pores, forming good inter-crystalline pores. 2) Two phases of kaolinite are developed in the study area. The first phase of kaolinite is mainly filled in the dissolution pores of early carbonate cement, showing a tiny "worm" shape; the second phase of kaolinite is filled in the dissolution pores of ferrocalcite and ankerite cements, some kaolinite have the characteristics of alkaline dissolution, and the second phase of kaolinite is symbiotic with late illite. 3) The reservoir in the third member of Dongying Formation has a certain ability to seep, so that the "byproducts" formed by feldspar dissolution can be taken away by the fluid. However, under the action of destructive diagenesis, the seepage ability of the reservoir will gradually deteriorate, eventually causing "byproducts" to accumulate in the pores and reduce the physical properties of the reservoir. 4) The effect of kaolinite and siliceous cement on reservoir properties are "double-edged sword". When the content of kaolinite and siliceous material is low, dissolution of feldspar is beneficial to improving the physical properties of reservoirs; while the high content of kaolinite and siliceous is not conducive to the improvement of reservoir quality.

Key words: kaolinite, reservoir properties, dissolution, formation stage, CFD18-2 oil field

CLC Number: 

  • P59
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