川西地区二叠系火山岩地震采集关键技术应用及效果

四川盆地火山岩发育区生储盖组合配置好,油气成藏条件优越.2018年,YT1井获得高产工业气流,证实了该区二叠系火山岩具有较大的油气勘探潜力.但由于以往地震资料的信噪比低、成像精度不高,难以满足火山岩有利相带的精细刻画及井位部署需求.为此,通过高精度三维观测系统设计、井—震联合采集施工、动态激发井深设计、低频检波器接收技...

Application and effect of key seismic acquisition technologies for Permian volcanic rocks in western Sichuan Basin

The volcanic rocks developed in Sichuan Basin are well distributed in sources,reservoirs,and cap rocks with favorable conditions for hydrocarbon accumulation.High-quality volcanic porous reservoirs have been successfully drilled in Well YT1 in2018,and thus the high-yield industrial gas flow was obtained.This proves that Permian volcanic rocks in Sichuan Basin have great oil and gas exploration potential.However,due to the low signal-to-noise ratio and imaging accuracy of previous seismic data,it is difficult to meet the needs of fine characterization for favorable faces of volcanic rocks and well location deployment.High-precision key acquisition technologies have been successfully applied to seismic exploration in volcanic rocks,including high-precision three-dimensional geometry design,shot and vibroseis joint acquisition operation,well depth design of dynamic stimulation,and low-frequency geophone receiving technology.As a result,the signal-to-noise ratio and resolution of the seismic data of the target layer have been greatly improved,and the seismic identification mode of volcanic rock effusive faces has been formed by using new data.The plane distribution of effusive and overflow faces of Permian volcanic rocks in this area has been effectively identified,which has greatly promoted the process of natural gas exploration in new areas and new fields of Sichuan Basin.