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解释复杂断块区低品质地震资料的合理思路是 ,先解释大断层控制的构造格局和整个形态 ,再解释大断块内的构造细节及油层。在此思路指导下 ,在解释区域构造形态时 ,采用了形成相干数据体了解断层展布规律 ;用二维剖面建立构造模式指导低品质三维地震资料的解释 ;断裂展布法解释区域构造形态 ;解释主断层时充分利用深度切片 ;多个专家进行平行解释寻找解释共同点。在解释局部构造时 ,注意解释油层顶面构造 ;利用工作站的功能进行反射层的精细对比 ;利用叠前深度偏移数据体解释构造 ;地震资料的处理和解释一并进行。通过上述方法 ,地震解释效果有了很大的提高 ,使钻井成功率由原来的 38 提高到现在的 80 。
The reasonable idea for interpreting low-quality seismic data in complex fault blocks is to first explain the tectonic configuration and overall morphology of the fault-controlled structure and then explain the structural details and reservoirs within the fault. Under the guidance of this train of thought, when interpreting the regional tectonic morphology, we adopt the method of forming coherent data to understand the law of fault propagation, construct tectonic model with two-dimensional profile to guide the interpretation of low-quality three-dimensional seismic data, interpret the regional tectonic morphology by fracture spreading method, Depth slices are used to explain the main fault; multiple experts find parallel explanations to find common ground. When interpreting the local tectonics, pay attention to explain the top surface structure of the oil layer; use the function of the workstation to make a detailed comparison of the reflector layers; explain the structure by using the prestack depth migration data body; and process and explain the seismic data together. Through the above method, the seismic interpretation effect has been greatly improved, so that the drilling success rate increased from 38 to 80 now.