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由于苏里格气田苏75区块东、西部沉积特征不同,导致地震资料特征、气层位置、AVO特征不同,利用AVO技术获得的单一参数以及烃类指示属性难以获得满意的储层预测结果。为此,文中通过对地震资料的CMP道集分析、气层理论模型正演及井旁道气层模型正演,发现不论气层顶、底界面的AVO响应的极性如何,反射振幅的绝对值均随着炮检距的增大而增大,利用AVO技术可以有效检测目的层段中较厚的气层。本次研究利用拟泊松比及拟横波反射系数较好地检测了苏75区块气层的分布特征,检测结果与井资料吻合程度较高,为该区的油气开发提供了技术支持。
Due to the different sedimentary characteristics of the eastern and western Su 75 blocks in the Sulige gas field, the seismic data characteristics, the location of the gas layers and the AVO characteristics are different. Therefore, it is difficult to obtain the satisfactory reservoir prediction results using the single parameters obtained by the AVO technique and the hydrocarbon indication properties. Therefore, in this paper, through the CMP gathers analysis of seismic data, forward modeling of gas stratum and forward modeling of gas pathways beside well, it is found that no matter the polarity of the AVO response of the top and bottom interface of the gas layer, the absolute of the amplitude of the reflection The value increases with the increase of offset, and the AVO technique can effectively detect the thicker gas layer in the target interval. In this study, the distribution characteristics of the gas layer in the Su-75 block are well detected by using the pseudo-Poisson’s ratio and the quasi-transverse wave reflection coefficient. The test results are in good agreement with the well data and provide technical support for the oil and gas development in the area.