地震趋势异常识别技术及其在碳酸盐岩缝洞型储层预测中的应用——以塔里木盆地英买2井区为例

针对碳酸盐岩缝洞型储层，特别是杂乱弱振幅反射特征的储层预测难度较大。在对地震反射波形成机理分析的基础上，提出了地震趋势异常识别碳酸盐岩缝洞型储层的新方法。该方法利用趋势面分析技术，近似求取地层界面反射波，根据波的叠加原理，有效分解出缝洞型储层的地震响应，达到对缝洞型储层有效预测的目的。地震趋势异常技术不但能识别“串珠”状地震反射所代表的储层，同时可有效识别“杂乱”状弱振幅地震反射所代表的储层，这一新方法补充了缝洞型储层预测的方法，为井位部署提供依据，在实际应用中效果良好。

Principles and application of a seismic trend anomaly diagnostic technique:a case study on carbonate fractured-cavity reservoirs in Yingmai 2 area, Tarim Basin

As for carbonate fractured-cavity reservoirs, especially for those characterized by chaotic weak reflection, it is very difficult to make a reservoir prediction. Based on analyzing formation mechanism of seismic reflection, a new method to recognize carbonate fractured-cavity reservoirs by using seismic trend anomaly was proposed. This method uses a technique of trend surface analysis to approximately obtain the interface reflection wave, effectively decomposes seismic reflection of fractured-cavity reservoirs according to principles of wave superposition, and finally predicts fractured-cavity carbonate reservoirs efficiently. The technique can not only recognize reservoirs represented by “beadlike” seismic reflection but also those by “chaotic” seismic reflection with weak amplitude. The method has produced good effects in practical application, such as providing a significant reference value for the geometric arrangement of wells and complementing the prediction of fractured-cavity reservoirs in the carbonate area of Tarim Basin.