地震波形联合叠前反演技术在白云深水区的应用

Application of Seismic Waveform and Prestack Inversion Technology in Baiyun Deep Water Area

利用地震正演及流体替换技术,对白云深水区北坡A圈闭SQ21.0砂体钻遇的气层与水层的低阻抗"亮点"特征分别进行了分析,指出由于储盖组合的不同,低阻抗"亮点"的强弱与储层含气性并没有线性的对应关系。在低阻抗"亮点"强弱不能表征含气性的情况下,通过区域岩石物理分析,得到表征流体特征的λρ(λ为拉梅常数,ρ为密度)属性是白云深水区含气性识别的敏感属性。通过叠前反演得到λρ属性体,预测L3气田东砂条具有较高的含气性。预测结果得到了实钻结果的证实,证明了地震波形联合叠前反演技术在珠江口盆地白云深水区烃类检测方面的有效性。

With the seismic forward inversion and fluid substitution technology,the low resistivity 'bright spot' of gas zone and water zone of SQ21.0 sand body of Trap A encountered in drilling was analyzed in the north slope of Baiyun Deep Water Area,it was pointed out that the strong and weak value of 'bright spot' had no linearity relation with gas-bearing property because of different reservoir-cap assemblages.Under condition of gas-bearing property not presenting with the strong and weak value of 'bright spot',through the petrophysics analysis,it was recognized that was sensitive to gas zone.With the data of prestack inversion,it was forecasted that the east sand of L3 Gas-field is a higher gas-bearing area,the result is demonstrated by well drilling,which further proves that it is effective in hydrocarbon detection of Baiyun Deep Water Area.