岩性油气藏 ›› 2023, Vol. 35 ›› Issue (3): 161–168.doi: 10.12108/yxyqc.20230314

• 石油工程与油气田开发 • 上一篇    

斜井各向异性地层随钻侧向测井响应规律及快速校正方法

李丰丰1, 倪小威2, 徐思慧2, 魏新路3, 刘迪仁1   

  1. 1. 长江大学 油气资源与勘探技术教育部重点实验室, 武汉 430100;
    2. 中国石油塔里木油田公司 产能建设事业部, 新疆 库尔勒 841000;
    3. 中国石油集团测井有限公司 辽河分公司, 辽宁 盘锦 124000
  • 收稿日期:2022-08-15 修回日期:2022-09-05 出版日期:2023-05-01 发布日期:2023-04-25
  • 第一作者:李丰丰（1998—），男，长江大学在读硕士研究生，研究方向为电法测井正反演。地址：（430000）湖北省武汉市蔡甸区大学路111号。Email：cj21701@163.com。
  • 通信作者: 刘迪仁(1965-),男,博士,教授,主要从事电法测井正反演、煤层气和复杂储层测井评价及光纤传感技术等方面的教学和研究工作。Email:liudr@yangtzeu.edu.cn。
  • 基金资助:
    国家重点研发计划项目子课题 “地下及井中地球物理勘探技术与装备”（编号： 2018YFC060330502） 资助。

Response characteristics and correction of LWD laterolog in anisotropic formations and deviated boreholes

LI Fengfeng1, NI Xiaowei2, XU Sihui2, WEI Xinlu3, LIU Diren1   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    2. Production Capacity Construction Division, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    3. Liaohe Branch of CNPC Logging Corporation, Panjin 124000, Liaoning, China
  • Received:2022-08-15 Revised:2022-09-05 Online:2023-05-01 Published:2023-04-25

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摘要： 采用有限元数值模拟方法与参数敏感性函数,模拟了螺绕环式随钻侧向测井仪在斜井各向异性地层中的响应特性;通过分析仪器对层厚/围岩、各向异性、井斜角的响应敏感程度,并基于正演结果分段拟合,针对不同的井斜角,提出一种井斜/各向异性快速校正的计算方法。研究结果表明:①当目的层厚度小于0.5 m时,仪器的响应受围岩影响严重;当目的层厚度为0.5~5.0 m时,仪器的响应同时受围岩和各向异性的影响;当目的层厚度大于5.0 m时,各向异性对仪器响应的影响占主导。②当井斜角小于30°时,测井响应受各向异性系数影响较小,视电阻率相差最大为2.5 Ω·m;当井斜角大于30°时,仪器响应受各向异性影响严重,不能反映地层水平电阻率。③井斜/各向异性校正法在电导性地层与厚度较大的电阻性地层中具有更好的校正效果。

关键词: 斜井, 各向异性, 随钻侧向测井, 探测深度, 分辨率, 敏感性, 有限元数值模拟

Abstract: The finite element numerical simulation method and parameter sensitivity function were used to simulate the response characteristics of toroidal coil excitation LWD laterolog instrument in anisotropic formation and deviated boreholes，the sensitivity of the instrument to the formation thickness/surrounding rock，anisotropy and well deviation angle were analyzed，and based on forward modeling results segment fitting，a calculation method for rapid correction of well deviation/anisotropy was proposed for different well deviation angles. The results show that：（1）When the thickness of the target layer is less than 0.5 m，the instrument response is seriously affected by the surrounding rocks. When the thickness is 0.5-5.0 m，the instrument response is affected by both the surrounding rock and anisotropy. When the thickness is greater than 5.0 m，the influence of anisotropy on the instrument response is dominant.（2）When the well deviation angle is less than 30 °，the logging response is less affected by the anisotropy coefficient，and the maximum difference of apparent resistivity is 2.5 Ω·m. When the well deviation angle is greater than 30 °，the instrument response is seriously affected by anisotropy and cannot reflect the horizontal resistivity of the formation.（3）This method has better correction effects in conductive formation and resistive formation with larger thickness.

Key words: deviated boreholes, anisotropy, LWD laterolog, investigation depth, resolution, sensitivity, finite element numerical simulation

中图分类号: 

  • TE353
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