滇东北高桥一带火山岩区二维地震观测系统的应用与认识

Application and understanding of 2D seismic observation system at volcanic rock area in Gaoqiao District,Northeast Yunnan

滇东北高桥地区位于四川盆地南缘勺寨向斜高桥复向斜内,区内页岩气资源较为丰富,但是地质工程条件相对复杂,地表地形起伏较大、植被茂密,出露地层以火山岩为主,常规地质勘探手段难以对深部页岩层系进行较好的勘探。采用“1炮3线制”二维地震宽线观测系统,按照三线全部接收最大炮检距5100 m进行最终叠加处理,最终叠加剖面信噪比较高,波组特征良好,同相轴连续性较强,在滇东北高桥一带火山岩覆盖的构造复杂地区获取了更加准确的构造与地层解译结果,为下一步的资源找矿工作提供了重要依据。

Gaoqiao District in Northeast Yunnan is located at the south margin of Sichuan Basin in the Shaozhai syncline and Gaoqiao complex syncline.It is rich in shale gas resources,but the geological condition is relatively complex,the surface topography undulates greatly,the vegetation is very dense,and the exposed strata are mainly the volcanic rocks,the conventional geological exploration methods are difficult to carry out the better exploration result for deep shale series.The“1 shot 3 wire system”2-dimensional seismic observation system of wide line is adopted,and the final stacked processing is carried out according to the maximum offset of 5100 m received by all three lines.The final stacked section has high signal-to-noise ratio,good wave group characteristics and strong continuity of the same phase axis.More accurate structural and stratigraphic data have been obtained in the complex structural area covered by the Gaoqiao volcanic rock in Northeast Yunnan.It has provided an important science basis for the next work of resources exploration.