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由于复杂三维异常体模型与实际的地质结构更为接近,研究复杂地质结构的物理性质逐渐成为研究的热点.CSAMT三维模拟中,积分方程法因只需要对异常区域进行离散,具有占有内存少,运算速度快等优点.为了解复杂三维地质结构的CSAMT响应特征,本文先设置围岩为花岗岩体的含有倾斜断层等构造的三维复杂模型,利用积分方程法对它进行正演模拟并对模型的CSAMT响应特征进行分析.发现当异常体在垂直于测线方向的尺度发生变化时,在不同测线上观测的响应特征有所不同,进一步说明如果需要提高资料的解释效果,需要做三维勘探.最后基于油气藏电性结构特征,设置了含油构造的层状模型并进行正演模拟运算,含油构造模型的CSAMT响应特征表明,电性结构异常体的存在对电场的影响比对磁场的影响更敏感,这为我们以后的资料解释工作提供了最好采用电场总场资料而不用磁场总场资料的理论依据.
Because the complex three-dimensional anomalous body model is more similar to the actual geological structure, the study of the physical properties of complex geological structures has gradually become a hot research topic.In the three-dimensional simulation of the CSAMT, the integral equation method only needs to discrete the abnormal regions, In order to understand the CSAMT response characteristics of complex three-dimensional geological structures, this paper firstly sets up a three-dimensional complex model of the granite body with inclined faults and other structures. Integral equation method is used to simulate the CSAMT response. CSAMT response characteristics, and found that when the abnormal body changes in the direction perpendicular to the measuring line, the response characteristics observed on different survey lines are different, which further shows that if we need to improve the interpretation of the data, we need to do three-dimensional exploration. Finally, a layered model of oil-bearing structure is set up based on the electrical structural characteristics of oil and gas reservoirs and forward modeling is performed. The CSAMT response characteristics of the oil-bearing tectonic model indicate that the influence of the existence of electrical structural anomalies on the electric field is more than that on the magnetic field Sensitive, which for our future data interpretation provides the best use of field data and not The theoretical basis of field data with magnetic field.