综合物探方法在钻井平台裂隙勘探中的应用

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英文篇名：Application of comprehensive geophysical methods to fracture exploration under drilling platforms 作者：王安平 ; 周昊 ; 王强 英文作者：Wang Anping;Zhou Hao;Wang Qiang;Sichuan Zhongcheng Institute of Coalfield Geophysical Engineering Co., Ltd.;Sichuan Changning Gas Development Co.Ltd., PetroChina Southwest Oil and Gasfield Company; 关键词：高密度电法 ; 音频大地电磁法 ; 裂隙勘探 ; 环境保护 ; 优化钻井 英文关键词：High-density resistivity method;;Audio magnetotelluric method;;Fracture exploration;;Environmental protection;;Drilling optimization 中文刊名：天然气技术与经济 英文刊名：Natural Gas Technology and Economy 机构：四川中成煤田物探工程院有限公司;四川长宁天然气开发有限责任公司; 出版日期：2019-07-09 08:50 出版单位：天然气技术与经济 年：2019 期：04 语种：中文; 页：23-27+74 页数：6 CN：51-1736/TE ISSN：2095-1132 分类号：P631;P618.13

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。
        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.

引文

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