二维波阻抗反演在东海南部某工区的应用实例

The Application of Two-Dimensional Impedance Inversion to the Southern East China Sea

由于白垩系和侏罗系年代老,埋藏深,储层孔渗条件差,导致地震剖面上反射界面较弱,分辨率低;加上二维工区面积大,井资料少等因素,使得该地区的储层预测工作很难开展。主要针对东海南部某二维工区中生代地层进行了地震波阻抗反演,对该工区可能存在的储层空间展布进行了预测,结果显示白垩系的顶部发育一套玄武岩层,底部发育一套含砾砂岩地层,主要集中在工区东南部构造上;白垩系中段以砂泥岩薄互层为主;上侏罗统储层物性较好,具有一定厚度和空间分布;中、下侏罗统存在较薄的致密砂层。

The disadvantaged factor, such as deep-seated reservoir, worse rock petro-physical property, longer survey line and well data incomplete, results to the weak seismic reflection and lower seismic resolution in late Mesozoic. Therefore, it is hard to make a study on reservoir characterization in this area. In this paper, 2D seismic impedance inversion for late Mesozoic interval has been executed in the south ECS area. The results of inversion show that upper basalt and lower glutenite reservoir concentrated in the structure SE in K^-K2 strata, in the middle of which is dominated by thin alternating layers of sandstone and mudstone; better petro- physical property reservoir in J1 strata, thin and tight sandstone reservoir in J2-J3 strata.