石油学报 ›› 2016, Vol. 37 ›› Issue (3): 371-381.DOI: 10.7623/syxb201603009

• 地质勘探 • 上一篇    下一篇

随钻电磁波电阻率测井联合反演方法及其应用

蔡军1,2, 张恒荣2, 曾少军2, 高永德2, 程远方1   

  1. 1. 中国石油大学石油工程学院 山东 青岛 266580;
    2. 中海石油(中国)有限公司湛江分公司 广东 湛江 524057
  • 收稿日期:2015-08-05 修回日期:2016-01-25 出版日期:2016-03-25 发布日期:2016-04-12
  • 通讯作者: 蔡军,男,1971年11月生,1994年毕业于江汉石油学院矿场地球物理专业,现为中国石油大学(华东)油气井工程专业博士研究生、中国海洋石油总公司湛江分公司勘探专家、高级工程师,主要从事测井综合应用研究工作。Email:caijun@cnooc.com.cn
  • 作者简介:蔡军,男,1971年11月生,1994年毕业于江汉石油学院矿场地球物理专业,现为中国石油大学(华东)油气井工程专业博士研究生、中国海洋石油总公司湛江分公司勘探专家、高级工程师,主要从事测井综合应用研究工作。Email:caijun@cnooc.com.cn
  • 基金资助:

    中国海洋石油总公司"十二五"重大专项"南海西部海域典型低孔低渗油气藏勘探开发关键技术研究及实践"(CNOOC-KJ125ZDXM07LTD02ZJ11)资助。

Joint inversion method of electromagnetic wave resistivity logging while drilling and its application

Cai Jun1,2, Zhang Hengrong2, Zeng Shaojun2, Gao Yongde2, Cheng Yuanfang1   

  1. 1. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Zhanjiang Branch, CNOOC China Limited, Guangdong Zhanjiang 524057, China
  • Received:2015-08-05 Revised:2016-01-25 Online:2016-03-25 Published:2016-04-12

摘要:

针对海上油气田高正压差井筒条件下随钻测井电阻率受钻井液低侵影响的问题,提出了随钻电磁波电阻率测井联合反演方法,设计了一种基于视电阻率曲线分离程度的反演初始值选取方案,通过反演可以获得原始地层电阻率和钻井液侵入深度。数值模拟结果显示,初始值选取精度满足工程应用需求,地层真电阻率和钻井液侵入深度参数反演相对误差小于0.5%。时间推移测井资料分别反演所得地层真电阻率一致,表明该方法稳定可靠。对中国南海西部东方区块随钻测井资料开展电阻率反演应用研究,结合反演成果开展了钻井液侵入规律统计,得到了钻井液侵入深度与地层孔隙度、渗透率、钻井液柱压力、钻井液浸泡时间及地层电性变化等参数的统计关系,其对钻井液侵入预测与评价具有参考价值。该电阻率联合反演方法可推广应用于其他海域随钻电磁波电阻率测井,对储层评价与储量计算具有重要意义。

关键词: 随钻测井, 电磁波, 电阻率, 联合反演, 钻井液侵入, 时间推移测井

Abstract:

In view of the fact that the electromagnetic wave resistivity logging while drilling(LWD) is affected by low invasion of drilling fluid under the condition of a shaft with positive high pressure difference in offshore oil and gas fields, a joint inversion method of electromagnetic wave resistivity logging while drilling was proposed in this study. Then a selection scheme of initial inversion value was designed based on the separation degree of apparent resistivity curves, so as to obtain the original formation resistivity and drilling-fluid invasion depth through inversion. Numerical simulation results show that the accuracy of initial value selection can meet the requirements of engineering application, and the relative errors of inversion parameters such as true formation resistivity and drilling fluid invasion depth are less than 0.5%. The true formation resistivity obtained through respective inversion of time-lapse logging data is consistent, proving that this method is steady and reliable. A resistivity inversion application study was carried out according to LWD data in western South China Sea. In combination with inversion results, the statistics were performed on drilling-fluid invasion laws to obtain the statistical relationship between drilling-fluid invasion depth and various parameters such as formation porosity, permeability, drilling-fluid column pressure, drilling-fluid soaking time and formation resistivity variation, etc., which provides a reference for the prediction and evaluation of drilling-fluid invasion. This joint resistivity inversion method can be applied to LWD in other seawaters, and has great significance to reservoir evaluation and reserve calculation.

Key words: logging while drilling, electromagnetic wave, resistivity, joint inversion, mud-filtrate invasion, time lapse logging

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