提升低井控制区构造精度研究

Study on Improving Structural Accuracy in Low Well Control Area

在井控程度较低区域,为了弥补仅凭地震构造解释垂向分辨率不足的缺陷,利用水平井随钻测井资料对构造进行优化,为油气田开发和评价提供精确的构造资料。通过构建已钻定向井物性与构造顶面距离之间的关系,对比分析水平井随钻测井特征,结合地震反演,快速、准确地对低井控制区的构造进行精细刻画,提高了构造研究精度。X油田应用实践表明,调整后的构造准确反映了水平井轨迹与顶面构造距离的变化趋势,后期钻井误差明显减小,对低井控区域构造起到显著的优化作用。

In order to compensate defects of low vertical seismic resolution during structure study in low well control area, drilling and logging of horizontal wells are used to optimize structure, which can provide accurate structure data for oil and gas field development and evaluation. Established is the relationship between property of drilled directional well and distance to its structure top surface, comparatively analyzed are the logging characteristics of horizontal well, fine structure in low well control area is optimized fast and accurately in combination with seismic inversion to enhance structure research accuracy. Practical application in X oilfield shows that the adjusted structure can accurately reflect variation tendency of horizontal well trajectory to its structure top surface and drilling errors in later period are reduced obviously. This method is very effective for enhancing the accuracy of structure in low well control area.