转换波资料在川西坳陷储层预测中的应用

Application of converted wave data in reservoir prediceon for Chuanxi depression

转换波资料解释具有优质储层预测可靠、裂缝检测信息丰富、流体性质判断准确等优势。在川西坳陷新场地区,针对深层须家河组目的层,探讨了利用三维三分量地震资料进行储层预测的方法。利用多分量地震资料和纵横波测井资料,建立了裂缝型正演地质模型,获得了裂缝各向异性介质中地震波传播特征;通过纵、横波井震联合标定,弄清了地震相与沉积相的关系,确定了纵波和转换波反射同相轴的地质含义;对纵、横波资料进行匹配处理,使纵波与转换波的同层反射时间、振幅、相位、频率和波形一致;通过全波属性分析和纵波与转换波联合解释研究等,形成了针对川西坳陷储层预测的转换波地震资料解释技术。在川西坳陷深层须家河组优质储层预测、裂缝检测和含气性识别中,该技术获得了良好的应用效果,钻井获得了高产工业气流。

Converted wave data interpretation technology has the advantages of responsibly predicting high-quality reservoirs,providing abundant information for fracture detection and accurately identifying fluid properties,etc.Aiming at deep Xujiahe formation in Xinchang area of Chuanxi depression,we discussed the probability of using 3D3C seismic data for reservoir prediction.By utilizing multi-component seismic data and P-/S- wave logging data.the fractured forward modeling geological model was established and the propagation characteristics of seismic wave in fractured anisotropic medium was obtained.Seismic-well joint calibration of P-ware and S-wave was carried out to clarify the relation of seismic facies and sedimentary facies,and identify the geologic meanings of reflection events of P-wave and converted wave.Matching process was carried out on P-wave and S-wave data to make it accordant for reflecting time,amplitude,frequency and reflected wave shape of the same layer in P-wave data and converted data.Then,the full wave attributes were analyzed and synthetic interpretation of P-wave and converted wave was carried out.All the above steps form a series of converted-wave seismic data interpretation technologies. The technologies obtain good application results in high-quality reservoir prediction,fracture detection and fluid distinguishing in Xujiahe formation of Chuanxi depression.The followed drilling achieves high productive industrial gas flow.