基于测井资料的地层应力计算及其影响因素研究

Study on Formation Stress Calculation and Its Influential Factors Based on Logging Data

准确可靠的地层应力分析可预测裂缝发育带及空间分布。在充分结合常规测井、偶极阵列声波和FMI资料的基础上,通过测井法得到了纵向上连续的地层应力剖面,同时结合FMI资料的井眼崩落和压裂缝特征约束反演出了地层应力方向。通过全直径岩心在实验室模拟了岩心的波速各向异性,进一步验证了上述2种结果的可靠性,为地层应力方向的确定提供了一种实用有效的参考方法。对影响现今地层应力场分布的特征因素进行了探讨。综合描述了研究区块的地层应力分布状态,裂缝的发育规律和裂缝展布,达到了辅助识别裂缝发育带的目的。

Reliable and accurate stress analysis can predict the fracture zone and the spatial distri bution, and it is of great significance for oil and gas exploration and development. Combining with conventional logging data. dipole acoustic logging data and FMI information, obtained is the longitudinal stress profile spreading along the depth by logging method. Combining with borehole breakout and hydraulic fracture characteristics of FMI information, formation stress direction is inversed simultaneously. Especially simulated is core velocity anisotropy by the full diameter core in the laboratory. And further verified is the reliability of the two results mentioned above. Pro vided is a practical and effective reference method for determination of stress direction. In addi tion, discussed are the influential factors of formation stress field distribution. At last, comprehensively described are status of stress distribution of the studied block, the regularity of fracture development and fracture distribution, thereby providing an assistant method for identification of fracture zone.