地质通报2026，Vol.45Issue(4)：693-707,15.DOI:10.12097/gbc.2025.01.043
基于岩石力学特性的变质岩储层脆性评价及其主控因素——以渤中19-6气田为例
Brittleness evaluation of metamorphic rock reservoirs based on rock mechanics characteristics and its main controlling factors:A case study of Bozhong 19-6 gas field
摘要
Abstract
[Objective]In order to clarify the brittleness characteristics of basement metamorphic rock reservoirs in Bozhong 19-6 gas field,Bohai Bay Basin,and provide accurate basic data for the selection of favorable areas in the subsequent exploration and development of this area.[Methods]Based on whole rock mineral analysis experiment by X-ray diffraction,geophysical logging data and pre-stack seismic data,The brittleness characteristics of basement metamorphic rocks in Bozhong 19-6 gas field in Bohai Bay Basin were characterized by mineral component method,static rock mechanics parameter method and seismic brittleness inversion method,and the single well and spatial distribution characteristics of brittleness were defined.Combined with physical property test,mercury injection experiment and rock mechanics experiment data,the main controlling factors of brittleness of metamorphic rocks were discussed.The significance of brittleness characteristic of metamorphic rock on fracture development degree and fracturing ability is also clarified.[Results]The results show that the brittle mineral component method based on quartz,feldspar,dolomite and calcite and the static rock mechanics parameter method have good applicability to the evaluation of the single well brittleness of the basement metamorphic rock of Bozhong 19-6 gas field.The plane distribution of the metamorphic rock brittleness has strong heterogeneity,and the vertical distribution characteristics are mainly controlled by structural characteristics and weathering.Reservoir physical property,pore radius and burial depth are the main influencing factors of brittleness.Meanwhile,brittleness index has a good positive correlation with fracture development degree and fracturing ability of metamorphic rock.[Conclusions]The brittleness evaluation results of the basement metamorphic rock reservoirs in the Bozhong 19-6 Gas Field are of great significance for predicting high-quality fractured reservoirs and optimizing fracturable intervals.关键词
渤海湾盆地/渤中19-6气田/脆性特征/岩石力学/影响因素/裂缝/压裂Key words
Bohai Bay basin/Bozhong 19-6 gas field/brittleness characteristic/spatial distribution/influencing factors/fractures/fracturing分类
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程奇,吴金涛,刘文超,赵雨佳,鲍明阳..基于岩石力学特性的变质岩储层脆性评价及其主控因素——以渤中19-6气田为例[J].地质通报,2026,45(4):693-707,15.基金项目
"十三五"国家科技重大专项《渤海油田加密调整及提高采收率油藏工程技术示范》(编号:2016ZX05058-001) Supported by the National Science and Technology Major Project in the 13th Five Year Plan(No.2016zx05058-001) （编号:2016ZX05058-001）
