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在常规油气勘探领域,高精度的重磁资料能够非常好的完成油气资源的远景评价,为地震勘探和钻井提供指导.在非常规油气勘探领域,重磁勘探方法显得尤为重要.因为非常规油气资源的地质结构、圈闭条件、储层评价、成藏机理、渗流特征等方面更加复杂和未知,地震勘探和钻井难以直接开展,亟需非地震方法的优选规划.由于重磁位场方法并不能“特异性”的揭示地下页岩分布和页岩气的资源潜力,从某种程度上说,重磁位场方法在常规油气和非常规油气的勘探技术是没有多大区分的,核心都是“综合”二字.其中,对重磁资料的处理要经过常规的延拓、剩余重力异常提取和磁异常化极等,以及重力异常剥皮、park反演、梯度反演等关键处理,能够获取特定地层的厚度与埋深和断裂信息.本文以页岩气资源的重磁位场勘探技术为中心,通过调研国内外重磁方法在非常规油气勘探阶段的应用实例,总结规律,构建利用位场方法开展页岩气等资源勘探的技术体系与流程.
In the field of conventional oil and gas exploration, the high-precision gravity and magnetic data can fulfill the long-term evaluation of oil and gas resources and provide guidance for seismic exploration and drilling.In the field of unconventional oil and gas exploration, gravity and magnetic exploration methods are particularly important because unconventional oil and gas Seismic prospecting and drilling are difficult to carry out directly due to the complexity and unknown aspects of the geological structure, trapping conditions, reservoir evaluation, reservoir forming mechanism and seepage characteristics of resources, and the optimal planning of non-seismic methods is urgently needed.Because of the method of gravity and magnetic potential field It is not possible to reveal the underground shale distribution and the resource potential of shale gas in terms of “specificity”. To some extent, the gravity and magnetic potential field method does not make much difference between the exploration technologies of conventional oil and unconventional oil and gas. The core Among them, the treatment of gravity and magnetic data to go through the conventional extension, the residual gravity anomalies and abnormal magnetic pole extraction, as well as abnormal gravity skinning, park inversion, gradient inversion and other key Processing, can obtain the thickness and depth of buried and fracture information of a particular formation.In this paper, the heavy and magnetic field exploration technology of shale gas resources as the center, through the study of gravity and magnetic methods at home and abroad in the unconventional Application examples gas exploration stage, summed up the law, constructed using potential field method to carry out technical system and process exploration of shale gas.