南方海相页岩气电磁法识别与预测方法研究

We are going to carry out identification and prediction study for shale gas based on its geophysical parameters (resistivity and polarizability) with wide field electromagnetic (WFEM) method, and takes the shale gas of Cambrian and Permian from some field sites which located in south China as research examples. At first, rock physical property survey and measurement will be conducted to reveal the relationship between petrophysical and electromagnetic response, and to establish the basis of using geophysical data to predict rock parameters and to evaluate and predict the reservoir. Secondly, we are going to carry out WFEM numerical simulation on target geological layer with given depth, thickness and resistivity and polarizability, and then the optimum parameters for measurement will be set up based on our result. At last, WFEM field experiment will be conducted on some national key shale gas sections. According to the EM response results, the gas-bearing formations (including depth, thickness and some other key geological parameters) will be revealed. We finally summarized an evaluation process about shale gas identification and prediction using WFEM method, including data acquisition, processing and interpretation, which will provide an effective shale gas exploration and prediction technology using geophysical method. This project will promote the shale gas exploration and development and has important practical significance on promoting the development of geophysics methods and increasing the domestic energy surety.

本项目拟开展基于广域电磁法的页岩气大深度、高精度识别与预测评价研究。首先通过物性调查与测试，揭示岩石物性与电磁响应宏观物理特征的关系，厘清电性参数与含气性关键指标之间的定量关系，探索页岩气的电磁法探测敏感参数，建立基于电磁法的页岩气含气性特征模型；其次开展电磁法数值模拟，揭示在给定储层的埋深、厚度、电阻率和极化率差异时的响应特征，总结最佳测量装置和参数；然后开展重点区块页岩气电磁法识别与预测评价试验，揭示储层埋深、厚度、有机碳含量等关键地质参数的电阻率和极化率响应规律，形成针对页岩气的大深度广域电磁法采集-处理-解释技术流程和综合评价技术，实现页岩气储层关键地质参数的电磁法探测，联合含气性特征模型实现储层的含气性评价，建立一套经济而又行之有效的页岩气探测技术。本项目对于促进页岩气勘探开发，推动地球物理方法研究，提高国内能源保障能力，具有重要的现实意义和战略意义。

本项目开展了基于广域电磁法的页岩气大深度、高精度识别与预测评价研究。首先通过物性调查与测试，揭示了岩石物性与电磁响应宏观物理特征的关系，厘清了电性参数与含气性关键指标之间的定量关系，探索了页岩气的电磁法探测敏感参数，建立了基于电磁法的页岩气含气性特征模型；其次开展了电磁法数值模拟，揭示在给定储层的埋深、厚度、电阻率和极化率差异时的响应特征，总结了最佳测量装置和参数；然后开展重点区块页岩气电磁法识别与预测评价试验，揭示了储层埋深、厚度、有机碳含量等关键地质参数的电阻率和极化率响应规律，形成了针对页岩气的大深度广域电磁法采集-处理-解释技术流程和综合评价技术，实现了页岩气储层关键地质参数的电磁法探测，联合含气性特征模型实现了储层的含气性评价，建立了一套经济而又行之有效的页岩气探测技术。本项目形成的技术对于促进页岩气勘探开发，推动地球物理方法研究，提高国内能源保障能力，具有现实意义和战略意义。