大庆外围油田地应力特征及人工裂缝形态分析

通过分析大量的试验资料，简要论述了地应力研究的方法和手段，搞清了大庆外围油田部分区块的地应力分布规律。研究结果表明，井点地应力大小以最大垂向主应力为主，水力压裂裂缝为垂直缝；最大水平主应力方向以近东西向为主，水力压裂裂缝的延伸方向也以近东西向为主；但受断层影响的平面地应力大小和方向差异较大，导致水力压裂裂缝的延伸方向有所改变，大量的现场微地震人工裂缝方位监测结果也说明了这一点。

Terrestrial Stress Characteristics and Artificial Fracture Pattern Analysis of Daqing Periphery Oilfield

This article briefly elaborates the research approach and means of terrestrial stress. Through the analysis of massive experimental data, it has clarified the terrestrial stress distribution rules of partial blocks in Daqing peripheral oilfield. The conclusion is that the size of terrestrial stress mainly is vertical principal stress maximum and the fracture of hydraulic fracturing is vertical. The direction of the maximal horizontal principal stress is mainly close to transmeridian and the outspread direction of the hydraulic fracturing is also mainly close to transmeridian. Influencing by the faults, the terrestrial stress size and direction on the plane differs greatly, which can make the outspread direction of the hydraulic fracturing change. Massive monitored results of on-site microseism artificial fracture azimuth has accounted for this point.