地震正反演技术在春光油田沙湾组二砂组薄互层储层中的应用

Application of seismic forward inversion technique in thin interbedded reservoirs from Ⅱ sand group of Shawan formation in Chunguang oilfield

受地震波分辨率的影响,春光油田沙湾组二砂组不同时期单砂体在尖灭带附近形成的薄互层储层无法在地震剖面上识别。为了厘清薄互层内部反射的调谐效应,结合实际的沉积规律,建立了四组波阻抗模型,分析了薄互层储层的地震响应特征。针对这四套砂体的薄互层储层模型,用分频反演能识别出四套砂体的薄互层储层。根据理论模型研究结果,在春光油田二砂组薄互层储层中应用正反演技术取得了良好的效果,多口井试获高产工业油流。

Due to the influence of seismic wave resolution,the thin interbedded reservoirs formed by single sand body near the pinch out zone in different periods from Ⅱ sand group of Shawan formation in Chunguang oilfield cannot be recognized on seismic profile.In order to clarify the tuning effect of internal reflection of thin interbedded reservoirs,four wave impedance models were established and the seismic response characteristics of thin interbedded reservoirs were analyzed.Aiming at the thin interbedded reservoir model of the four sets of sand bodies,the thin interbedded reservoir of the four sets of sand bodies can be identified by frequency division inversion.According to the results of theoretical model study,the application of forward inversion technique in thin interbedded reservoirs of Ⅱ sand group in Chunguang oilfield has achieved good results,and the high-yielding industrial oil flow has been tested in several wells.