石油学报 ›› 2018, Vol. 39 ›› Issue (5): 564-569.DOI: 10.7623/syxb201805007

• 油田开发 • 上一篇    下一篇

基于三维莫尔圆的裂缝有效性评价方法及应用

陆云龙, 吕洪志, 崔云江, 陈红兵   

  1. 中海石油(中国)有限公司天津分公司 天津 300459
  • 收稿日期:2017-06-19 修回日期:2017-10-26 出版日期:2018-05-25 发布日期:2018-06-06
  • 通讯作者: 陆云龙,男,1986年9月生,2009年获中国石油大学(华东)勘查技术与工程专业学士学位,2012年获中国石油大学(华东)地球探测与信息技术专业硕士学位,现为中海石油(中国)有限公司天津分公司工程师,主要从事测井理论研究、资料处理与解释等工作。Email:luyl5@cnooc.com.cn
  • 作者简介:陆云龙,男,1986年9月生,2009年获中国石油大学(华东)勘查技术与工程专业学士学位,2012年获中国石油大学(华东)地球探测与信息技术专业硕士学位,现为中海石油(中国)有限公司天津分公司工程师,主要从事测井理论研究、资料处理与解释等工作。Email:luyl5@cnooc.com.cn
  • 基金资助:

    中海石油(中国)有限公司综合科研项目"阵列声波测井精细处理及复杂储层流体判别技术研究"(YXKY-2014-TJ-03)和中国海洋石油总公司"十二五"科技重大项目"渤海典型低孔低渗油藏勘探开发关键技术与实践"(CNOOC-KJ-125-ZDXM-07-LTD-TJ-02)资助。

Method for fracture effectiveness evaluation based on 3D Mohr Circle and its application

Lu Yunlong, Lü Hongzhi, Cui Yunjiang, Chen Hongbing   

  1. Tianjin Branch, CNOOC China Limited, Tianjin 300459, China
  • Received:2017-06-19 Revised:2017-10-26 Online:2018-05-25 Published:2018-06-06

摘要:

复杂储层裂缝评价是储层研究的重要内容。针对复杂储层现今裂缝有效性定量评价的难题,通过阵列声波测井、电成像测井提取的地应力及裂缝参数信息,采用基于临界应力断层假说的三维莫尔圆方法定量分析裂缝有效性的方法,通过井眼周围应力场分布特征,选取合理的地应力模型计算地层三维应力并根据成像测井拾取的裂缝倾角、倾向等属性。在此基础上根据岩石强度理论通过三维莫尔圆计算裂缝面上岩石正应力与切应力,求取岩石裂缝面上的摩擦系数,采用临界应力断层假说定量分析裂缝有效性特征。渤海地区JZ油田应用结果表明,通过三维莫尔圆计算的裂缝摩擦系数能够反映裂缝有效性的差异,与产能匹配较好,可以用于产能分析,是裂缝定量评价的一种有效手段。

关键词: 裂缝, 地应力, 莫尔-库仑准则, 三维莫尔圆, 摩擦系数, 产能

Abstract:

Fracture evaluation in complex reservoir is an important part of reservoir research. Aiming at the difficulties of quantitative evaluation on present fracture effectiveness in complex reservoir, three-dimensional Mohr Circle method based on critical stress fault hypothesis is used to quantitatively analyze fracture effectiveness using geo-stress and fracture parameters acquired by array acoustic logging and resistivity imaging logging. According to the distribution characteristics of stress field around the borehole, a reasonable geo-stress model is selected to calculate the three-dimensional stress of the layer. Moreover, fracture dips, strikes and other properties are collected through imaging logging. On this basis, according to rock strength theory, the normal stress and shear stress of rock on the fracture surface are calculated by three-dimensional Mohr Circle, so as to obtain the friction coefficient of rock fracture surface. The critical stress fault hypothesis is used to quantitatively evaluate fracture effectiveness characteristics. The application in JZ oilfield of Bohai Sea indicate that the friction coefficient calculated by three-dimensional Mohr Circle can reflect the differences in fracture effectiveness, matching well with productivity and able to be used for productivity analysis, so it is an effective method for fracture quantitative evaluation.

Key words: fracture, geo-stress, Mohr-Coulomb criterion, 3D Mohr Circle, friction coefficient, productivity

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