交叉偶极子阵列声波测井资料在裂缝性储层评价中的应用

Application of Novel Cross-dipole Acoustic Logging Data in Fractured Reservoir Evaluation.

美国阿特拉斯公司新一代交叉偶极子阵列声波测井仪(XMAC-Ⅱ)将偶极子技术与最新发展的单极技术结合在一起,提供了测量地层纵波、横波和斯通利波的最好方法,在分析地层各向异性方面也具有独特优势。重点阐述了通过交叉偶极子阵列声波测井资料提供的纵波、横波、斯通利波在各接收器上的声波幅度、衰减及地层速度各向异性的分析结果,识别裂缝性储层中裂缝发育井段及类型,判断裂缝有效性及裂缝系统区域有效性,进而有效划分储集层。该方法对裂缝性储层评价的结果与声电成像测井资料有较好的相关性,并获得了较好的地质应用效果,拓展了偶极子阵列声波的应用范围。

The novel cross-dipole acoustic tool(XMAC-II)made by Baker-Hughes ATLAS Company combined di-pole and monopole technique effectively. It can offer the best measurement of the formation wave-slowness, amplitude and attenuation coefficient of the compressional, shear and Stoneley wave types that may occur in array acoustic waveform data. Further more, it has special superiority in the evaluation of shear-wave azi-muthally anisotropy. This paper emphasizes the method of estimating the interval, types and validity of fractures in the fractured reservoir, and the relation between the direction of fracture systems and the maximum horizontal stress. At the same time it can be used to evaluate the favorable reservoir development zones by analyzing above results. There has a good correlativity between the two reservoir evaluation results from this method and borehole imaging data.