川西南部二叠系火山岩相地震预测及分布主控因素

为了刻画川西南部地区二叠系火山岩相展布、厘清其分布主控因素,基于已钻井火山岩地球物理响应特征分析,结合火山机构模型正演,明确不同火山岩相所对应的地震响应特征,进而采用多信息地震属性技术预测火山岩相展布;结合火山岩相、基底断裂、古地貌等信息研究火山岩相分布主控因素。研究结果表明,川西南部BMM地区发育规模性火山岩爆发相发育区,面积达500 km²,是四川盆地火山岩油气勘探区带拓展的有利区。火山岩相分布主要受基底断裂及火山喷发前古地貌控制。

Study on seismic prediction and main controlling factors of Permian volcanic facies in southwestern Sichuan Basin,China

Based on the analysis of geophysical response characteristics of drilled volcanic rocks and the forward modeling of volcanic mechanism,the seismic response characteristics of different volcanic facies are studied in order to find out the distribution of Permian volcanic facies in southwest Sichuan and clarify the main controlling factors of their distribution.The volcanic facies distribution is predicted by using multi-information seismic attribute technique and the main controlling factors of volcanic facies distribution are studied through comprehensive analysis of volcanic facies,basement faults and paleogeomorphology.The results show that BMM area in the southwest of Sichuan has developed volcanic eruption facies with an area of 500 km²,which is a favorable area for the exploration of volcanic rocks in the Sichuan Basin.It is recognized that the volcanic facies distribution is mainly controlled by basement faults and paleogeomorphology before volcanic eruption.