Quantitative evaluation of impact of authigenic chlorite on reservoir quality: a case study of the Member 3 of Weizhou Formation in Weixinan sag, Beibu Gulf Basin
1 School of Geosciences,Northeast Petroleum University,Daqing,Heilongjiang 163318,China; 2 Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC),Zhanjiang, Guangdong 524057,China; 3 Research Center of Exploration and Development Technology of Yanchang Oilfield Co., Ltd.,Yan’an, Shaanxi 716001,China
Abstract:In order to quantitatively study the impact of authigenic chlorite on reservoir property, different analytical results, including conventional core analysis, scanning electron microscopy, thin section identification, laser particle size analysis and clay mineral X-ray diffraction, were used to illustrate the impact of authigenic chlorite on quartz overgrowth, pore structure and reservoir property under the limited controlling factors of reservoir,taking the reservoir of the Member 3 of Paleogene Weizhou Formation in Weizhou-12-X oilfield in Weixinan sag, Beibu Gulf Basin as an example. The comprehensive score evaluation method is put forward to quantitatively evaluate the controlling effect of authigenic chlorite on reservoir physical property. The results show that the “controlling pore throat” effect in fine sandstone with low chlorite content(20%~30%)and high quartz overgrowth and calcite content(7.3%)is equivalent to that of fine sandstone with high chlorite content(30%~40%)and low quartz overgrowth and calcite content(2.4%)when the rock dissolution is stronger than the chlorite precipitation, and their “controlling pore throat” effects are complementary. The “controlling porosity and permeability” effect of authigenic chlorite restrict with other factors (e.g., grain size, sorting, contents of cement and clay), which shows complementarity and difference. The “controlling porosity and permeability” effect of medium-grained sandstone with relative low chlorite content is equivalent to the fine-grained sandstone with relative high chlorite content. The “controlling porosity and permeability” effect of authigenic chlorite in the fine-grained sandstone with low clay content is weaker than that of the fine-grained sandstone with high clay content. In short, for a given lithofacies, there is a positive correlation between the contents of coated or lined chlorite and porosity and permeability, while it shows a negative correlation between the content of pore filling chlorite and porosity and permeability.
Chen Guo-Song,Meng Yuan-Lin,Huan Jin-Lai et al. Quantitative evaluation of impact of authigenic chlorite on reservoir quality: a case study of the Member 3 of Weizhou Formation in Weixinan sag, Beibu Gulf Basin[J]. JOPC, 2021, 23(3): 639-650.
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