海上多波多分量地震烃类直接检测方法研究及应用
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摘要
岩石实验结果证明 ,YGH盆地的岩石含气后 ,会导致 1岩石的体积模量明显降低 ,剪切模量基本不变 ;2纵波速度明显降低 ,横波速度基本不变 ;3多波地震属性参数比 (如速度比和泊松比 )出现明显异常。从纵横波剖面的对比来看 ,浅层气层在纵波剖面上表现为亮点 ,在转换横波剖面上表现正常。利用多波多分量地震信息计算了已知气层的纵横波参数比 ,气层的纵横波参数比的变化规律与岩石实验室结果完全一样。基于此 ,我们提出 :1联合利用多波地震属性参数比 (振幅比和速度比 )来检测浅层气层 ;2用泊松比来检测深层气层的方法。该方法对已知气层的预测结果和井的测试结果完全一致 ,效果很好。利用该方法检测出了 YGH盆地深层气层
The results of geophysical rock property measurement have proved: if the rocks in YGH basin bear gas, the following facts would be produced:① The rock bulk modulu distinctly reduces, and the shear modulu has no obvious change;② The P -wave velocity distinctly reduces, and that of S -wave basically has no distinctly change;③ The multiwave seismic parameter ratios(eg. velocity and Poisson ratio)will appear distinctly abnormal. By correlating P and S -wave seismic profiles, we found that the shallow gas horizons will bring up “bright spot” on the P -wave seismic profiles, and nothing appears on the S -wave profiles. Using multiwave seismic data, we computed P - and S -wave parameter ratios of the known gas horizons. The results were the same as that from laboratory. So, we developed a direct hydrocarbon detecting method:① for shallow gas horizons, we used the P -/S - wave amplitude ratio and velocity ratio to detect hydrocarbon;② for deep gas horizon, we used Poisson ratio to do that. For the known gas horizons, the detected results were the same as that of drilling. Using this method, we have successfuly detected some deep gas horizons in YGH basin.
The results of geophysical rock property measurement have proved: if the rocks in YGH basin bear gas, the following facts would be produced:① The rock bulk modulu distinctly reduces, and the shear modulu has no obvious change;② The P -wave velocity distinctly reduces, and that of S -wave basically has no distinctly change;③ The multiwave seismic parameter ratios(eg. velocity and Poisson ratio)will appear distinctly abnormal. By correlating P and S -wave seismic profiles, we found that the shallow gas horizons will bring up “bright spot” on the P -wave seismic profiles, and nothing appears on the S -wave profiles. Using multiwave seismic data, we computed P - and S -wave parameter ratios of the known gas horizons. The results were the same as that from laboratory. So, we developed a direct hydrocarbon detecting method:① for shallow gas horizons, we used the P -/S - wave amplitude ratio and velocity ratio to detect hydrocarbon;② for deep gas horizon, we used Poisson ratio to do that. For the known gas horizons, the detected results were the same as that of drilling. Using this method, we have successfuly detected some deep gas horizons in YGH basin.
引文
[1] 张树林 ,李绪宣 ,姜立红 .海上多波多分量地震地质层位对比方法 [J] .天然气地球科学 ,2 0 0 0 ,11( 1) :2 8.
[2 ] 张树林 .多波地震地层各向异性的初步研究和探讨 [J] .天然气地球科学 ,1999,10 ( 5 ) :7.
[3 ] 张树林 .横波地震基本理论的研究 [J] .地球科学进展 ,1992 ,5 ( 2 ) :18.
[4] SH.Danbom et al.Shear-wave Exploration[J] .Society of Exploration Geophysicists,1987,2 ( 1) :2 3 .
[2 ] 张树林 .多波地震地层各向异性的初步研究和探讨 [J] .天然气地球科学 ,1999,10 ( 5 ) :7.
[3 ] 张树林 .横波地震基本理论的研究 [J] .地球科学进展 ,1992 ,5 ( 2 ) :18.
[4] SH.Danbom et al.Shear-wave Exploration[J] .Society of Exploration Geophysicists,1987,2 ( 1) :2 3 .
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