不同火山岩相在地震上表现为不同的地震反射特征,而火山多期喷发及后期构造改造使其地震反射特征更为复杂化,运用单一地震属性同时刻画两种或多种混合岩相火山岩较为困难,因此,在无井区准确部署火山岩探井难度很大。针对松辽盆地松南断陷火山岩储层,结合火山机构的不同特点,优选出瞬时振幅一阶导与低频振幅两种分别针对爆发相和溢流相较为敏感的地震单属性,与反映机构内部裂缝发育的蚂蚁体进行数据体融合,较好地解决了火山岩相快速清晰识别和火山机构边界及内幕裂缝发育情况准确刻画的问题。经松南断陷S地区多口井实钻验证,储层预测结果与实钻情况相符。因此,该方法可以为类似无井区火山岩勘探部署提供可靠依据。

It has been proved that the volcanic gas reservoir has high output and large reserves in Songnan fault depression ofSongliao basinand the volcanic rock reservoir in non-well area is an important target for oil and gas exploration being in present of low oil price.Due to the fact that different volcanic facies have different seismic reflection feature on the seismic section, and several volcanic eruptions and the late tectonic reworking make the seismic reflection characteristics more complicated, using a single seismic attribute to describe two or more mixed volcanic facies is very difficult.Based on analysis of response relationship between the development of different lithofacies reservoirs and the sensitive attribute, technique of seismic multi-attribute fusion was applied.The volcanic reservoir were predicted by using the attribute fusion method of multi-attributes clustering and ant tracking, among which,the multi-attributes combining with two main types of sensitive seismic attributes of volcanic rocks:derivative instantaneous amplitude and low-frequency amplitude.The method can identify volcanic facies from other facies quickly and clearly, describe the boundary of the volcanic mechanism and development situation of the fractures of volcanic mechanism inside.The seismic multi-attribute fusion method was used to describe the reservoir of the mixed rock facies in S area of Songnan fault depression and the prediction results are consistent with the actual drilling,which can provide the basis and technical reference for the exploration and deployment of volcanic rocks in the area without well.