【摘要】 川西坳陷孝泉地区深层须家河组致密砂岩气藏属于典型非常规裂缝性气藏,储层识别、裂缝检测、含气性识别是气藏研究的重点和难点.转换波3D3C勘探可同时获得反映岩石骨架和各向异性特性的C波资料及反映骨架及流体特性的P波资料,因而适用于川西孝泉深层超致密裂缝性气藏.在3D3C地震勘探中,三维三分量地震采集方法是采集到高质量多分量原始资料的技术保障,本文重点研究这种采集方法.首先根据地球物理参数,结合地质任务要求,分析了三维三分量观测系统设计的方法及观测系统参数,然后根据分析结果和勘探目的层的实际情况设计了同时适合纵波勘探和转换波勘探的面元尺寸、最大和最小炮检距、接收线距、束间滚动距等参数并确定了三维三分量观测系统.该观测系统在孝泉地区资料采集中,获得的三分量资料波组特征清楚,同相轴连续,反射信息丰富;Z分量剖面和R分量剖面反射层次清楚,目的层反射特征明显,具有非常好的构造形态一致性.更多还原

【Abstract】 The deep target XuJiahe group is belong to super dense sandstone and unconventional fracture type reservoir in the depression basin of west SiChuan province.By virtue of 3D3C seismic prospecting can acquire converted wave(which can describe rock frame and anisotropic features) and compressed wave(which can describe rock frame and fluid features) simultaneously,it has the both advantages of P-wave and C-wave,so it’s favor of the deep target super dense and fracture type gas reservoir exploration.Through combined P-wave and C-wave data processing,inversion,multi wave attributes and azimuth analysis,S-wave splitting study and comprehensive interpretation,it can solves the identification of better gas reservoir and fracture prediction problems,and it also has potential identification capability in fluid features.For solving the super dense and fracture type gas reservoir prospecting problems,we perform multi-wave 3D3C seismic prospecting technology.Acquisition method in 3D3C seismic exploration is very important.In 3D converted-wave exploration,3D3C seismic acquisition method is the technical support to acquire high-quality multi-component original data under the condition of reasonable technique.Therefore,according to geophysical parameters,combined with the geological requirement,method for designing 3D3C geometry and parameters of geometry were analyzed. Then,Based on the results and the actual situation of exploration targets,some parameters fit for P-wave exploration and converted-wave exploration were designed,such as the bin size,the maximum and minimum offsets,the receiver line distance,the swath rolling distance etc.And 3D3C geometry was defined.The geometry was used in Xiaoquan area,western Sichuan Depression and the acquired 3D3C data based on this geometry have clear and continuous events and abundant reflection information.There are high S/N ratio and resolution in the single shots.Therefore,there are clear reflection imaging,obvious reflection characteristics for the target and good consistency in structure form for both the Z section and the R.And we have acquired preferable effect in 3D3C data acquisition in Xiaoquan area which from the design of layouts.更多还原