地震波形指示反演在珠江口盆地A油田薄层预测中的应用

珠江口盆地A油田主要发育三角洲前缘沉积,砂泥岩互层严重,且储层薄、横向连续性差,分布规律难以掌握,随着开发进程的加快,其对储层预测的要求越来越精细,而常规反演方法很难满足高精度储层预测的要求。针对这一难题,结合该油田沉积相分布稳定的特征,这里在地震波形相控反演思想的基础上,将地震波形指示反演方法应用到A油田的薄层预测中,研究表明:①该方法的预测结果既在空间上体现了地震相约束,平面上也更符合该油田的地质沉积规律;②三维地震波形特征直接反映沉积相信息,减小了常规人工划分沉积相约束的工作量和主观认识的不确定性;③地震波形指示反演突破常规基于空间域插值算法的限制,对井位分布的均匀性没有严格要求,大大提高了储层反演的适用领域。该方法首次应用于珠江口盆地,并且在A油田的薄储层及薄隔夹层反演预测中,为该油田的开采提供了可靠的资料基础,取得了很好的应用效果,实现了井震协同的高分辨率储层预测,落实了薄层的空间展布。

Application of seismic motion inversion in thin layer prediction of A oilfield in Pearl river mouth basin

A oilfield of Pearl river mouth Basin mainly developed delta front deposition,Sandstone and mudstone are severely stacked together,And the reservoir has thin thickness and poor lateral continuity,the law of distribution is difficult to master,with the development of the requirements,as a result,reservoir prediction is required more and more precise,but the conventional inversion method is very difficult to satisfy the requirement of high precision of reservoir prediction. Aiming at this problem,combined with the characteristics of the oilfield which has a stable distribution of sedimentary facies,in this paper,based on seismic waveform inversion phase control idea,the Seismic Motion Inversion is applied to the prediction of thin indicator for A oilfield,research shows that :①the prediction results of this method not only reflect the seismic correlation beam in space,but also meet the geological depositional law of the oil field in the plane;②the characteristics of the 3D seismic waveform directly reflect the information of the sedimentary facies,and reduce the workload of conventional artificial division and the uncertainty of the subjective understanding;③seismic motion inversion breaks through the limitation of conventional spatial domain interpolation algorithm,and has no strict requirements for the uniformity of well location distribution,this greatly improves the application field of reservoir inversion. The method is applied to the Pearl river mouth basin for the first time,and has achieved good application results in the thin reservoir and thin interlayer inversion prediction in A oilfield. The high-resolution reservoir prediction of well and seismic synergy has been achieved,and the spatial distribution of thin layers has been implemented.