江汉盆地应城—监利剖面重震联合反演

使用重磁剖面图形交互实时计算正反演解释系统(IGGM)进行应城—监利剖面的重力反演。通过对剖面进行重震联合反演,得出该地区的构造格局,结果与地质事实相符,并推测出3条新的断层。J—T2和S两密度小的地层分隔其他密度大的地层,地层的速度、密度大小相间分布,形成“三硬夹两软”地层的规律。同时还分析了研究区重力、磁性和电性特征指示的地质构造,探讨了该区域的构造演变过程、基底、断层、褶皱、受力与构造运动之间的关系,指明喜山运动对江汉盆地改造和油气成藏的重要意义。

Application of Gravity-seismic Inversion to Yingcheng-Jianli Section, Jianghan Basin

A method of gravity inversion was promoted with IGGM gravitational and aeromagnetic data. A combined gravity-seismic inversion was applied to Yingcheng-Jianli section, Jianghan basin, and the structure frame in the study area was recognized. The results are consistent between the calculation and the fact, and 3 new faults are speculated. The conclusion is drawn that two small density strata of J -T2 and S separate big others to form a sandwich phenomenon, and that the velocity data and densities of strata regularly change between bigness and smallness. The indicator of geologic structures is also analyzed from the gravitational and aeromagnetic characteristics. The relationship among the faults, drapes, the force and tectonic movement is also discussed. It is revealed that the Himalayan movement is of great importance to the basin reformation and to the hydrocarbon accumulation.