摘要:
为明确渤海湾盆地渤中19-6气田基底变质岩储层脆性特征，为该区后续勘探开发中的有利区段优选提供准确的基础数据，基于X-射线衍射全岩矿物分析实验、地球物理测井资料以及叠前地震资料，利用矿物组分法、静态岩石力学参数法和地震脆性反演方法对渤海湾盆地渤中19-6气田基底变质岩的脆性特征进行表征，明确了脆性单井和空间分布特征，并结合物性测试、压汞实验以及岩石力学实验资料，探讨了变质岩脆性的主控因素，并明确了变质岩脆性特征对裂缝发育程度和可压裂性的指示意义。结果表明，基于石英、长石、白云石和方解石的脆性矿物组分法和静态岩石力学参数法对渤中19-6气田基底变质岩单井脆性的评价均具有良好的适用性，变质岩脆性平面分布具有较强的非均质性，垂向分布特征主要受构造特征和风化作用强弱控制。储层物性、孔隙半径以及埋深是脆性的主要影响因素，同时，脆性指数和变质岩裂缝发育程度、可压裂性具有较好的正相关关系，对优质裂缝型储层、可压裂层段优选具有重要意义。
Abstract:
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, 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. 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, which is of great significance for selecting high-quality fractured reservoirs and fracturing intervals.
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