复杂断裂综合解释方法在长昌凹陷的应用

长昌凹陷断裂系统复杂且密集,剖面上断层产状相似,存在解释困难、组合关系难以确定等难题,应用常规地震解释方法容易产生错乱,降低解释效率,为断层平面组合带来困难,严重影响构造圈闭搜索和油气运移研究。针对研究区存在的问题,基于相干技术,综合应用时间相干切片平面-剖面联合解释断层,沿层相干切片指导断层组合,断距定量分析验证断层平面组合,三维可视化技术验证断层空间组合4种技术的优势开展精细断裂解释。实际应用结果表明,在断裂复杂且密集发育区,运用综合解释方法能够克服常规解释方法的不足,极大地提高了复杂密集断裂解释的效率和准确性。

 The fracture system of Changchang Sag is complicated and dense and the faults have similar occurrence in profile. There is difficulty in interpretation and the relationship among planar connections is unclear. Conventional seismic interpretation is inclined to create confusion, reduce explanation efficiency and lead to difficulties for the fault planar combination, which seriously affects the study of structural traps and hydrocarbon migration. Using coherence technology to target these existing problems, four techniques are applied comprehensively for fine fracture interpretation in the study area. Specific practices include the following are:applying time coherent slices and profiles to explain the faults jointly, using coherent slices along the layer to guide the fault assemblage on planar, using the quantitative statistics of fault displacement to check the fault connection relationship and using 3D visualization technology to verify the spatial combination of faults. The practical application results show that the comprehensive interpretation method based on coherence technology can overcome the shortcomings of conventional interpretation and greatly improve the efficiency and accuracy of complicated fracture interpretation.

国家科技重大专项项目“海洋深水区油气勘探关键技术”(2016ZX05026-007)资助。