斜井岩心裂缝产状校正方法及其应用

为了准确实现斜井岩心裂缝的定向,基于岩层产状法、地层倾角测井法,提出了斜井岩心裂缝定向的思路并推导了相应的算法,将其应用于天33断块岩心裂缝的观察资料中.斜井中对岩心裂缝定向,只有进行井斜校正后,才能得到裂缝的真实产状,天33断块岩心裂缝在未进行井斜校正前其走向优势方向为近南北向,在校正后走向优势方向为近东西向,校正后结果与油田的后期动态开发资料以及区域构造应力场协调一致.通过校正数据分析认为不能单纯依据井斜角的相对大小判断是否需要井斜校正,岩层以及裂缝的倾角也会影响裂缝的倾向.该校正算法对岩心观察的其他线状、面状地质体同样适用.

An approach to correct the core fracture attitude in deviated boreholes and its application

To accurately orient the core fracture of deviated boreholes, the research thought and corresponding algorithm was proposed based on attitude of rocks and dip-logging method, and then applied to the observation data of core fracture of Tian-33 fault block. The actual attitude of fracture can be obtained only through hole-deviation correction. Before correction, the core fracture of Tian-33 fault block is mainly near north-south trending. After correction, it is dominantly near east-west trending, which is consistent with the late-stage dynamic development data and regional tectonic stress field of this oil field. Through analysis of the correction data, it is concluded that whether hole-deviation correction is required should not be determined simply by the relative value of hole deviation angle; strata and fracture dip angle also have an impact on fracture dip. Moreover, the above correction algorithm is also applicable for observing the core of other linear and planar geological bodies.