鄂尔多斯盆地陕北斜坡延长区块储层流体识别

延长油田区块位于鄂尔多斯盆地陕北斜坡东部延安单斜的中间部位，为研究天然气储层及储层中高含气分布区，2008年在延长油田区块内完成三维地震勘探344km2。本文对三维地震资料应用吸收系数、频谱分解、振幅衰减等地震属性进行流体识别试验。试验结果表明振幅衰减对含气层段异常响应相对敏感，吸收系数对高含气层段有一定反映。利用天然气储层各层段振幅衰减极大值，参考吸收系数剖面的高值层段，分析预测了三维区块含气概率高的平面分布区，2009年在预测的含气概率高分布区进行了探井验证，取得了比较理想的效果。

FLUID IDENTIFICATION OF GAS RESERVOIR AT YANCHANG BLOCK IN SHANBEI SLOPE, ORDOS BASIN

Yanchang block is located in the middle of Yanan single slope in eastern Shanbei slope, Ordos Basin. For researching the gas reservoir and gas-rich area in reservoir layers, 344 km2 3D seismic exploration have been completed in this area in 2008. In this paper, some fluid identification tests including seismic wave absorption coefficient study. seismic profile spectrum decomposition technique and seismic amplitude attenuation attribute have been made. The results of these tests indicate that seismic amplitude attenuation is sensitive for gas-bearing reservoirs and absorption coefficient is also sensitive only for gas-rich layers. Some high probability distribution zones of gas-rich have been analyzed and predicted by using the maximum value of seismic amplitude attenuation and referencing absorption coefficient profile. Several exploration bore holes were conducted at the zones for verifying predicted results, which produced a good conclusion in 2009.