AVO技术在YB地区礁滩储层预测中的应用

APPLICATION OF AVO TECHNOLOGY TO REEF-BANK RESERVOIRS PREDICTION IN YB AREA

通过对YB地区二叠系长兴组储层进行研究,确定该区礁滩储层地震反射为波谷,对区内已知井储层段进行AVO异常特征分析,认为该区含气层具有Ⅳ类AVO异常响应特征;含水层或非储层具有Ⅲ类AVO异常响应特征。利用AVO梯度G值异常对该区礁滩储层进行反演,预测了YB地区长兴组储层的有利含气范围,并进一步用G值剖面对正钻井的储层段进行预测。实践证明预测结果和测井资料相吻合,AVO技术可应用于礁滩储层含油气预测。

By studying Permian Changxing Formation reservoirs in YB area, it is determined that the seismic reflections ofreef-bank reservoirs in the area are wave troughs. AVO anomaly characteristics are analyzed for the reservoirs intervals of knownwells. It is believed that the gas-bearing formation has type lV of AVO anomaly response characteristics, while the aquifer and nonreservoirs have type Ⅲ. The inversion is carried out for reef-bank reservoirs using the AVO gradient and G-value anomaly. The favorable gas-bearing range of Changxing Formation is predicted, Reservoirs intervals of drilling wells are also predicted by further G-value section. Practice has proved that the predicted result corresponds to the logging data, AVO technology can be applied to the oiland gas prediction of the reservoirs.