海上多波多分量地震烃类检测方法研究

THE HYDROCARBON DETECTING METHOD OF MARINE MULTIWAVE MULTICOMPONENT SEISMIC

岩石实验结果证明:YGH盆地的岩石含气后,会导致(1)岩石的体积模量明显降低,剪切模量基本不变;(2)纵波速度明显降低,横波速度基本不变;(3)纵横波振幅比增大,速度比和泊松比降低,气层在纵波剖面上表现为亮点,在转换横波剖面上表现正常。利用多波多分量地震信息计算了已知气层的纵横波参数比,气层的纵横波参数比的变化规律与岩石实验室结果完全一样。基于此,我们提出了联合利用多波地震属性参数比(振幅比、速度比和泊松比)来检测气层的方法。该方法对已知气层的预测结果和井的测试结果完全一致,效果很好。利用该方法检测出了YGH盆地深层气层。

The result of rock experiment has proved, as the rock bears gas in YGH basin, it may lead to (1) the rock bulk modulus reduces obviously and shear modulus is not variable; (2) the compressional wave velocity reduces clearly and the shear wave velocity is not variable; (3) The amplitude ratio of compressional and shear waves increases and the velocity ratio and Poisson ratio reduce, the gas - bearing formation is as bright spot in compressional wave profile and as normal in converted shear wave profile. The parameter ratio of the compressional and shear waves of known gas - bearing formation is calculated by using multiple multicomponent seismic information. The result of rock experiment is as same as variable law of compressional and shear waves parameter ratio of gas - bearing formation. So we provide jointly to use the multiple seismic attribution parameter ratio (amplitude ratio, velocity ratio and Poisson's ratio) to detect gas reservoir. The result of well test is as same as predicting result of known gas reservoir . The deep - sealted gas in YGH basin is also discovered through this method.