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Quantitative characterization of vertical zonation of Mesozoic granite weathering reservoirs in the coastal area of eastern Fujian Province,China

引用

Petroleum Science 2023年第5期20卷 2664-2682页

作者： Jing-Song Hu Yi-Ming Jiang Hua-Feng Tang Wen-Rui Ma Peng Tao Ning-Yuan Sun College of Earth Sciences Jilin UniversityChangchun 130061JilinChina Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesChangchun 130061JilinChina CNOOC Shanghai Branch Shanghai 200030China

Weathering crust reservoirs have obvious vertical zonation,which is the focus of weathering crust reservoir research,but there is a lack of quantitative characterization *** achieve the quantitative characterization of granite weathering crust reservoir and provide the basis for oil exploration of granite weathering crust buried hill reservoir,in this paper,the vertical zonation of granite weathering crust reservoir is quantitatively divided by testing and analyzing the uniaxial compressive strength(UCS),magnetic susceptibility(MS),permeability,and chemical index of alteration(CIA)of the Mesozoic granite weathering crust in the coastal area of eastern *** results show that the granite weathering crust reservoir can be divided into four zones vertically:a soil zone(SZ),weathered and dissolved zone(WDZ),fracture zone(FZ),and bedrock zone(BZ).A cataclastic area is developed in the FZ and BZ,in which structural fractures are well-developed,the fracture surface density is usually greater than 200 m/m^(2),and the contribution to the fractures in the rock mass is up to about 50%,making this the sweet spot of the *** the SZ,the rocks are loose,and the pores are *** UCS is less than 10 MPa,and the average rate of change of the UCS(Δ_(σ))is *** average permeability is 2823.00 mD,and the average rate of change of the permeability(Δ_(κ))is *** average CIA is 74.9%.The average clay mineral content is 7%.The rocks in the WDZ have been significantly weathered by physical and chemical processes,and the weathering fractures and dissolution pores are *** average UCS is 18.2 MPa,and the averageΔ_(σ)is *** average permeability is 143.80 mD,and averageΔ_(κ)is *** average CIA is 65.3%.The average clay mineral content is 4%.Under the influence of tectonic movement and physical weathering,the rocks in the FZ have developed structural fractures and a few weathered *** average UCS is 57.9 MPa,and the averageΔ_

关键词： Granite weathering crust vertical zonation of reservoir Quantitative characterization Eastern Fujian Mesozoic granite

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