利用拟声波约束反演求取泥质含量的新方法及在断层侧向封闭性评价中的应用

New method of using quasi-acoustic inversion for calculating the shale content and its application in evaluation of lateral sealing ability of fault

在断层圈闭勘探中,对控圈断裂的侧向封闭性评价十分重要.但由于受到钻井资料的限制,目前在少井或者无井地区缺少有效的评价方法.本文对渤海湾盆地饶阳凹陷留楚地区进行拟声波约束反演,利用拟声波反演体提取楚18x控圈断裂两侧38口虚拟井的拟声波曲线,并计算虚拟井的泥质含量曲线;基于SGR算法对断层侧向封闭性进行定量评价,并与两口实钻井评价结果进行对比.结果表明,新方法评价结果更加符合实际勘探情况,证实了该方法在少井或无井地区应用的可行性.

In the fault trap exploration,it is important to evaluate the lateral sealing of fault controlling trap.But there are few effective evaluation methods in less or no well area because of the lack of drilling data.In this paper,we use the quasi-acoustic inversion body to extract quasi-acoustic curve of thirty eight virtual wells on both sides of Chu 18x controlling trap fracture,and calculate shale content curve of them to operate quasi-acoustilogging-restrained seismic inversion of Liuchu area in Raoyang sag of Bohai bay basin.According to SGR algorithm,the fault lateral sealing ablity is quantitatively evaluated.By contrast with the drilling evaluation results of two wells,it is indicated that the evaluation result of the new method is more in line with actual exploration.It is proved that this method is feasible in less or no well area.