利用偶极横波反射成像技术评价缝洞储层有效性

缝洞型储层有效性评价是深层油气勘探开发中面临的主要难题。对于储层中尺度较小的裂缝和断层,由于地震的分辨能力有限,而常规测井方法探测深度较浅,难以对该类地质特征进行准确评价。单井偶极横波反射成像技术能够有效利用低频横波的传播特点,对井旁20~30m范围内的声反射体进行成像。对偶极横波反射成像技术进行了深入研究,形成了从质量检测到空间反射体三维成像的全套处理流程和软件,提出径向—方位视图和径向—深度视图联合分析、偶极横波反射+微电阻率成像联合解释、井旁缝洞等地质构造产状交互拾取技术。该技术分别在碎屑岩地层和碳酸盐岩地层进行了应用,均取得明显应用效果,有效提升了缝洞型储层有效性评价的精度。

Effectiveness Evaluation of Cave-fractured Reservoir Based on Dipole Shear Wave Imaging

The effectiveness evaluation of cave-fractured reservoir is difficult in deep layer oil and gas exploration and development.Because of resolution limit of seismic and investigation depth of conventional logging,it is difficult to evaluate the small scale fractures and faults in reservoirs. Single well dipole shear wave imaging technology can provide images of acoustic reflectors around borehole within 20~30 m by propagation characteristics of low frequency transverse wave.Based on study of dipole shear wave imaging technology,a quality control to the space reflector 3D imaging of the full set of processes and software is established.The radial azimuth view combined with radial depth view analysis method and dipole shear wave imaging combined with micro conductivity imaging interpretation methodare proposed,w hichinteractivly picksup geological structures,such as fractures and holes.The technology isbetter used for clastic and carbonate formations logging.It improves the accuracy of cave-fractured reservoir evaluation effectively.