管道穿越岩溶段综合探测方法研究及应用  

Research and application of comprehensive detection methods for pipeline crossing karst sections

作　　者：牟晓东 MOU Xiaodong(SINOPEC Petroleum Engineering Design Co.,Ltd.,Dongying 257029,China)

机构地区：[1]中石化石油工程设计有限公司,山东东营257029

出　　处：《石油工程建设》2024年第6期32-38,63,共8页Petroleum Engineering Construction

基　　金：中石化石油工程设计有限公司科研课题“岩溶裂隙地段定向钻勘察及施工技术应用研究”(KY2023)。

摘　　要：管道定向钻穿越工程需提前查明岩溶裂隙地层发育状况,为穿越工程设计提供依据。跨孔弹性波层析成像和电磁波层析成像方法在岩溶裂隙调查中具有明显优势,但存在单一反演多解性和局限性的问题。提出了一种新的弹性波CT和电磁波CT联合反演方法,实施过程简单,反演收敛稳定,克服了单一反演多解性和局限性的问题。该方法的技术路径是将电磁波观测场强数据等效转换为弹性波旅行时,然后同弹性波数据进行联合迭代反演。数值模拟分析表明,能够对直径为孔距1/10的溶洞实现准确成像,比单独反演精度更高。实际应用中,对16对弹性波数据和13对孔电磁波数据实施了三维联合CT反演,对岩溶裂隙发育的空间展布进行了精细刻画,取得了较好的效果。Early identification of the development status of karst fissures is necessary for the pipeline crossing project,providing a reference for the design of crossing engineering.Though cross-hole elastic wave tomography and electromagnetic wave tomography methods have obvious advantages in investigating karst fissures,they are limited by the simplification and multiple solutions of the single inversion.This article proposes a new joint inversion method involving elastic wave CT and electromagnetic wave CT,which overcomes the above problems with an easy operation process and stable convergence.The technical path of this method includes equivalently converting electromagnetic wave observation field strength data into elastic wave travel time and performing joint iterative inversion with elastic wave data.Numerical simulations prove its ability to more accurately image karst caves having a diameter of only one-tenth of the hole spacing than single inversion.In practical applications,the three-dimensional joint CT inversion is conducted based on 16 pairs of elastic wave data and 13 pairs of hole electromagnetic wave data,accurately depicting the space distribution of karst fissures development.

关 键 词：管道穿越 岩溶探测 电磁波CT 弹性波CT 联合反演 

分 类 号：TE973.4[石油与天然气工程—石油机械设备]