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在油气管道河流穿越工程的勘察中,由于钻孔间距一般在30-100m,而且钻孔布置在中线两侧外15m,通常无法单纯依靠工程地质钻探等常规勘察手段来进行详细查明,容易漏掉地层中间的一些重要的不良地质作用,导致隧道穿越中出现漏水、定向钻穿越出现冒浆等工程事故,影响工程的正常进行。如何提高勘探精度、及时发现不良地质作用、节约勘探成本,成为油气管道穿越工程中一个亟待解决的问题。简要介绍了水域地震映像法的原理,较为详细的分析了该方法的特点,结合在油气管道穿越工程勘察中的工程实例,取得了良好的应用效果。
In the investigation of river-crossing engineering of oil and gas pipelines, since the spacing of drilling holes is generally 30-100m, and the holes are arranged 15m away from both sides of the centerline, they can not be easily identified by simple conventional exploration means such as engineering geological drilling, Some important adverse geological effects in the middle of the dropped formation lead to water leakage in the tunnel crossing and the occurrence of engineering accidents such as slurry blowing through the directional drilling, thus affecting the normal progress of the project. How to improve the exploration accuracy, discover the adverse geological effects in time and save the exploration cost has become an urgent problem to be solved in the pipeline crossing project. This paper briefly introduced the principle of seismic image method in water area, analyzed the characteristics of the method in detail, and achieved good application results by combining with engineering examples of oil and gas pipeline crossing engineering survey.