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致密油藏见气后井间缝网特征参数量化研究
张世明,王滨,任允鹏,刘同敬,高强,赵伟,侯春华,孙颖
0
(1.中国石化胜利油田分公司勘探开发研究院,山东东营257015;2.中国石油大学(北京)非常规油气科学技术研究院,北京102249)
摘要:
致密油藏压裂后通常在近井附近形成复杂的裂缝网络系统,注采井间缝网特征参数的定量描述,对后期气窜封堵措施定制和开发方案调整具有重要意义。在前人研究成果的基础上,根据物质守恒原理,完善裂缝孔隙度、裂缝渗透率、裂缝开度和裂缝线密度等主要缝网特征参数的表征函数,提出了致密油藏见气后井间缝网特征参数量化的计算方法和求解步骤。以胜利油田XN井组为例,计算得到井间缝网特征参数的量化结果:裂缝孔隙度为0.250%~0.251%,平均裂缝渗透率为42~1 563 mD,裂缝开度为14~87 μm,裂缝线密度为29~176条/m。分析认为:XN井组的裂缝孔隙度整体上远小于储层平均孔隙度,裂缝发育程度较强;各气窜单井的井间平均裂缝渗透率和平均气窜速度差异较大,以微裂缝为主,存在一定规模的气窜裂缝通道;气窜速度快的单井,表现出平均裂缝渗透率高、裂缝开度大和裂缝线密度小等特点。
关键词:  致密油藏  裂缝孔隙度  裂缝渗透率  裂缝开度  裂缝线密度  缝网特征
DOI:10.13673/j.cnki.cn37-1359/te.2020.06.008
基金项目:“十三五”国家科技重大专项“低渗—致密油藏高效提高采收率新技术”(2017ZX05009-004),国家重点研发计划“CO2驱油技术及地质封存安全监测”(2018YFB06055),中国石化重大示范工程课题“示范区跟踪调控与综合评价研究”(P18088-6)和“浊积岩低渗透油藏CO2驱技术研究与示范”(P18088-4)。
Study on quantitative method of characteristic parameters of inter-well fracture network after gas channeling in tight reservoirs
ZHANG Shiming,WANG Bin,REN Yunpeng,LIU Tongjing,GAO Qiang,ZHAO Wei,HOU Chunhua,SUN Ying
(1.Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;2.The Unconventional Oil and Gas Institute,China University of Petroleum(Beijing),Beijing City,102249,China)
Abstract:
After the fracturing in tight reservoirs,a complex fracture network system was usually formed near the well. The scientific and reasonable quantitative description of the characteristic parameters of the fracture network between injectionproduction wells was important to the customization of the sealing measures for gas channeling and the adjustment of development plans. Based on the previous research results,the characteristic functions of major characteristic parameters of the fracture network,such as porosity,permeability,opening,and line density of fractures,were improved with the principle of conservation of matter. Besides,the specific methods and steps for quantitative calculation of the characteristic parameters of inter-well fracture network after gas channeling in tight reservoirs were proposed. A case in point was the well group XN of Shengli Oilfield(Dongying City,Shandong Province). The quantitative calculation results of characteristic parameters of inter-well fracture network were obtained,namely fracture porosity of 0.250%-0.251%,average fracture permeability of 42-1 563 mD,fracture opening of 14-87 μm,and fracture line density of 29-176/m. According to the analysis,the fracture porosity of well group XN is far less than the average porosity of reservoir on the whole and the fracture is strongly developed. The average fracture permeability and average gas-channeling velocity vary drastically with each individual gaschanneling well. Micro-fractures are the majority,but there are some large fractures for gas channeling. The individual well with fast gas channeling is featured by high average permeability,large fracture opening,and low line density of fractures.
Key words:  tight reservoir  fracture porosity  fracture permeability  fracture opening  fracture line density  fracture network characteristics

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