应用多波多分量技术预测轮南地区中生界储集体

Predication of multi-wave and multi-component seismic exploration techniques on the Mesozoic reservoirs in the Lunnan, Tarim basin, Northwest China

在轮南地区地震转换波勘探中 ,研究了多波多分量地震资料采集、处理和解释的方法。采集时 ,要使药量、炮检距等满足接收转换波的要求 ;处理时 ,采用各向异性介质中的平面波理论与平面波的偏振投影技术 ,实现P波、SV波的波场分离 ,转换波处理时考虑到共转换点并非在炮点与检波点的中点 ,用共转换点 (CCP)道集求取其时距曲线进行叠加 ,得到转换波叠加剖面 ;解释时 ,首先进行P波剖面解释 ,正确认识波形 ,利用VSP测井和声波测井等资料标定转换波剖面后 ,解释反射明显的地球物理界面 ,制作压缩剖面 ,将P波剖面与SV波剖面一一对应分析 ,识别内幕波形变化 ,测算各种属性。应用该技术 ,发现轮南地区侏罗系与三叠系的储集体地震波动力学特征有明显差异。图 8表 1参

The multi wave and multi component seismic exploration has been used in the Lunnan area of Tarim Basin, Northwest China, including data collecting and processing and interpretation. In acquisition, to ensure the acquired converted wave data quality, a good mixture of charge sizes, offsets, etc. were necessaries and they were defined carefully. For the processing, plane wave based theory and plane wave based polarization and projection technique in anisotropy medium should be also considered and applied to separate P wave and SV waves data. And, for the interpretation, the P wave sections were first interpreted and the characteristics of the waveforms were understood clearly. The VSP data and sonic logging data were used to calibrate the marker horizons of converted wave sections, and to interpret the converted waves sections and to generate the compressed profile. The characteristics of the P and SV waveform sections were analyzed correspondingly on a purpose of identification for changing inner wave shapes and calculation of their characters. The application of above techniques in Lunnan area, Tarim basin shows an obvious difference of seismic dynamic characteristic of reflector between the Jurassic and Triassic reservoirs.