复杂断块区低品质地震资料解释方法

INTERPRETATION METHOD ON LOW QUALITY SEISMIC DATA OF COMPLEX FAULTED BLOCKS

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 thinking of interpreting low quality seismic data of complex fault block is to interprete large fault controlled structural framework and the whole structural feature first,then interprete small structures and oil layers within big block.In the interpretation of regional structural feature,coherence data set block was used to study fault distribution regularity;structural model built according to 2 D section was used to interprete low quality 3 D seismic data;to interprete regional structural feature based on fault distribution.In local structure interpretation,one should pay attention to the interpretation of the top structures of oil horizon and the correlation of reflecting horizon;then use pre stacking depth shift data to interprete structures.These method can considerably improve the results of interpretation,the success ratio of drilling can be improved from 380/0 to 800/0.