基于阵列声波测井的裂缝有效性定量评价方法  

Quantitative Evaluation Method of Fracture Effectiveness Based on Array Acoustic Logging

作　　者：陆云龙 崔云江 关叶钦 熊镭 LU Yunlong;CUI Yunjiang;GUAN Yeqin;XIONG Lei(Tianjin Branch, China National Offshore Oil Corporation, Tianjin 300459, China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《测井技术》2022年第1期64-70,共7页Well Logging Technology

基　　金：中海石油(中国)有限公司科技项目“渤海油田稳产3000万吨,上产4000万吨关键技术研究”(CNOOC-KJ135-ZDXM36-TJ-03);中海石油(中国)有限公司科技项目“渤中凹陷深层油气规模成藏主控因素”(CNOOC-YXKY-2018-TJ-01)。

摘　　要：裂缝有效性评价是储层品质研究的重要内容,直接影响产能大小。常规电阻率测井、成像测井对裂缝延伸范围等有效性评价存在困难。结合渤海油田裂缝性储层测井响应特征,提出了阵列声波测井定量评价裂缝有效性的方法。依据改进的多孔介质模型计算裂缝孔隙度,划分裂缝发育区域,在此基础上,对裂缝尺度进行划分,并确定有效性。针对裂缝发育区,首先,通过偶极横波远探测技术识别井眼附近大尺度宏观裂缝发育情况;其次,对成像测井拾取的小尺度裂缝,根据正交偶极四分量数据计算快、慢横波频散曲线,确定裂缝的延伸范围,同时利用地质力学莫尔圆法计算摩擦系数评价裂缝的产液能力,实现裂缝有效性综合评价。渤海油田应用结果表明,阵列声波测井能够准确的评价裂缝性储层裂缝发育程度、尺度规模及有效性,是评价储层裂缝的一种有效测井方法。Fracture effectiveness evaluation is an important part of reservoir quality research,which directly affects productivity.It is difficult to evaluate the effectiveness of conventional resistivity logging and imaging logging on fracture extension range.Combined with the logging response characteristics of fractured reservoirs in Bohai oilfield,a quantitative evaluation method of fracture effectiveness by array acoustic logging is proposed.According to the improved porous media model,the fracture porosity is calculated,and the fracture development area is divided.On this basis,the fracture scale is divided,and the effectiveness is determined.In view of the fracture development area,firstly,the development of large-scale macro fractures near the wellbore is identified by the dipole shear wave remote detection technology.Secondly,for the small-scale fractures picked up by imaging logging,the fast and slow shear wave dispersion curves are calculated according to the orthogonal dipole four component data to determine the fracture extension range,in the meantime,the friction coefficient is calculated by the geomechanical Mohr’s circle method to evaluate the fluid production capacity of fractures Comprehensive evaluation of fracture effectiveness.The application results in Bohai oilfield show that array acoustic logging can accurately evaluate the fracture development degree,scale and effectiveness of fractured reservoir.It is an effective logging method for reservoir fracture evaluation.

关 键 词：裂缝有效性 裂缝孔隙度 偶极横波远探测 频散曲线 莫尔圆 

分 类 号：P631.84[天文地球—地质矿产勘探]