【摘要】 为了有效探测钻井平台1 000 m以浅裂隙破碎带及其他不良地质体的发育情况,为后期优化钻井设计、建设及运行期的环境管理提供科学依据,以四川盆地川南地区页岩气钻井平台为研究对象,通过综合物探方法的应用实践,分析了钻井平台下方裂隙破碎带的电性特征,指出了在钻井过程中遇裂隙破碎带易发生钻井液漏失,对地下水及区域水环境造成一定的影响。研究结果表明:①采用高密度电法、音频大地电磁法对裂隙进行立体勘探,预测钻井施工对环境的影响,效果较好;②高密度电法对于地下埋深100 m以浅裂隙勘探效果较好,音频大地电磁法探测深度较大,对于地下埋深100～1 000 m裂隙勘探效果较好。结论认为:综合物探方法能够有效探测钻井平台1 000 m以浅裂隙破碎带及其他不良地质体的发育情况,可以为钻探工作规避风险提供依据,有助于实现经济建设与环境保护协调发展。更多还原

【Abstract】 In this study, many shale-gas drilling platforms in southern Sichuan Basin were taken as examples in order to effectively detect the development of some shallower fractured belts and other unfavorable geological bodies with buried depth less than 1000 m and to provide scientific basis for optimizing later drilling design, construction,and environmental management. After an analysis on electric characteristics of fracture belts, it’s indicated that drilling-fluid leakage easily occurs in these belts, which also has a certain impact on groundwater and surrounding environment. Results show that(1) both high density resistivity and audio magnetotelluric methods are good for 3D exploration of fractures and have predictive effect of drilling on environment; and(2) for fracture exploration, the former is better for fractures with buried depth less than 100 m whereas the latter is for those with buried depth ranging from100 m to 1000 m, respectively. It’s concluded that these two comprehensive geophysical methods may effectively detect the development of shallower fractured belts and other unfavorable geological bodies with buried depth less than1000 m, provide basis for avoiding drilling risk, and achieve coordinated development of economic construction and environmental protection.更多还原