应用地震纵波方位各向异性定量预测火山岩裂缝

裂缝是火山岩储层的重要组成因素,火山岩裂缝的定量预测是石油物探方法技术研究的前沿课题之一。从火山岩裂缝实际地质特征出发,基于叠前三维地震资料,采用纵波方位各向异性方法预测火山岩储层裂缝发育方向与相对密度;进一步结合FMI测井标定计算得到具有实际地质意义的裂缝密度定量预测成果。应用该方法对松南气田营城组火山岩储层进行裂缝定量预测研究,预测结果符合研究区火山岩裂缝发育规律并与主力含气储层区相吻合,验证了基于纵波方位各向异性的井震结合火山岩裂缝定量预测方法的有效性。

Fracture is a significant element of volcanic reservoir.The volcanic fracture quantitative prediction is one of the frontier issues in oil geophysical prospecting technology research.Based on the geological characteristics of volcanic and the prestack 3D seismic data,P-wave azimuthal anisotropy is applied to predict the facture orientation and the facture relative density in volcanic reservoir.Then FMI calibration is adopted to quantitatively calculate the fracture density with actual geological significance.This method is applied for fracture quantitative prediction in the volcanic layer of Yingcheng formation,Songnan Gasfield.The prediction

result is closely related to the development laws of volcanic fracture,and coincided with the main gas reservoir zones in Songnan Gasfield.The practical application shows that this well-seismic combination method based on P-wave azimuthal anisotropy can quantitatively predict volcanic fracture effectively.