正交偶极子阵列声波资料在江苏探区储层评价中的地质应用

The geologic application of orthogonal dipole array acoustic data in the reservoir evaluation of Jiangsu exploration area

偶极子阵列声波仪器,通过特殊的结构设计,无论在硬地层还是软地层,均可以采集到有效的纵波、横波、斯通利波数据,进行可靠的岩石力学分析;与常规资料结合,可完成适用的井眼稳定性分析。同时,记录的波列能量与幅度数据,可以有效识别裂缝发育带。通过对不同方向传播的快慢横波的分离、提取,可以判断地层各向异性的方向,进而识别出地层内现今最大主应力方向或裂缝集中发育区。利用斯通利波反射性原理,能够判断地层内的异常地质反射体,寻找层界面或有利的裂缝发育带;经过岩心刻度后,能估算出地层渗透率。

The dipole array acoustic instrument （XMACⅡ tools）, which was designed by special structure, can acquire data of effective compressional wave, shear wave, and Sloneley wave in rigid formation or soft formation, and reliable analysis of rock mechanics can be run on these bases. Suitable well-bore stability analysis carl be carried out by combination of conventional well-logging data and these above data. Meanwhile, energy of wave train and amplitude data can be usedto identify effectively developed fracture-zone. By separating and extracting fast-slow shear wave in different directions, anisot- ropy direction of the formation can be estimated. And then direction of current maximum-main-stress and developed fracture-zone in the formation can be identified. According to the reflection theory of Stoneley wave, the abnormal geologic reflectors in the stratum can be determined to seek for favorable developed-fracture-zone, and layer interfaces. The formation permeability can be estimated after calibrating by core data.