连片叠前深度偏移处理技术在孤西地区的应用

The Application of Pre-stack Depth Migration Technology for Guxi Merging

孤西断裂带地质构造十分复杂,速度横向变化较大,该区已进行了三维连片处理,但潜山的构造背景及准确细致的构造形态仍不清楚,制约了对该区带的深入地质研究和评价。采用匹配滤波、叠前数据规则化等技术对叠前连片道集进行精细处理后,再进行叠前深度偏移迭代,并利用层析成像法对层速度模型进行校正,成像剖面信噪比较高、潜山归位准确,内幕清楚,发现和落实了多个圈闭构造。

The geological structure of Guxl fault zone is very complex and the velocity changes a lot at lateral direction. 3D merging processing had been done, but it was still unclear about the structural settings and features of the buried hill Further geological studies and evaluations are restricted. After fine processing on pre-stack merging gathers by the technologies of matched filtering and pre-stack data regularization etc., pre- stack depth migration iteration was done and interval velocity model was regulated by tomography. The imaging profiles showed that the Sigual-to- Noise was higher, the buried hill was migrated to their right position, the internal structure was clear and several trap structures were found and confirmed.