地震相控预测技术及其在QHD32-6油田的应用

A technique of seismic facies-controlled prediction and its application in QHD32-6 oilfield

地震反演参数地质意义的多解性以及分辨率的限制给利用地震反演预测河流相储层单砂体带来很大困难。研究发现,地层的纵波速度、密度和波阻抗等参数随深度的变化符合一定的数学规律,且这些规律受沉积微相的控制;据此提出了针对砂体预测的"地震相控预测"技术,将地震反演结果转化为反映储层沉积微相特征的参数剖面,通过预测砂体发育的优势沉积微相实现对单砂体的预测,为地震反演资料能够应用于面向油藏开发的单砂体预测和沉积微相研究开辟了新的途径,具有重要的理论创新意义和推广应用价值。该项技术在QHD32-6油田应用结果与井点符合率达到90%,预测可信度高。

The geological ambiguity of seismic inversion parameters and resolution limitation have resulted in more difficulties in predicting single sandbodies of fluvial reservoir. Researches indicate that P-wave velocity, density and impedance of formation change with the depth in accordance with some mathematic laws that are controlled by sedimentary micro-facies. Based on these results, a technique of ＂seismic facies-controlled prediction＂ is developed for sandbody prediction, in which seismic inversion data are transformed into parameter profiles to reflect sedimentary micro-facies, and sandbody prediction is achieved by predicting preferential sedimentary micro-facies of sandbody development. This technique opens a new way to apply seismic inversion data to signal sandbody prediction and sedimentary micro-facies research for reservoir development, and is quite important to theory innovation and valuable in wide application in other fields. More than 90%of its prediction results are in accordance with the existed well locations in QHD32-6 oilfield, showing a high reliability of prediction.