天然气地球科学

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湖南保靖区块龙马溪组岩石力学特征及可压性评价

崔春兰,董振国,吴德山   

  1. 神华地质勘查有限责任公司,北京 102211
  • 收稿日期:2018-10-16 修回日期:2018-12-28 出版日期:2019-05-10
  • 通讯作者: 董振国(1962-),男,河南周口人,高级工程师,主要从事钻探工程技术和应用研究. E-mail:dzhenguo@aliyun.com.
  • 作者简介:崔春兰(1970-),男,内蒙古丰镇人,高级工程师,主要从事地质工程勘查技术和应用研究.E-mail:1013522284@qq.com.
  • 基金资助:
    “十三五”国家科技重大专项项目“页岩气勘查评价技术实验与应用推广”(编号:2016ZX05034004-004);
    国家重点研发项目“东部草原区大型煤电基地生态修复与综合整治技术及示范”(编号:2016YFC0501100)联合资助.

Rock mechanics study and fracability evaluation forLongmaxi Formation of Baojing block in Hunan Province

Cui Chun-lan,Dong Zhen-guo,Wu De-shan   

  1. Shenhua Geological Exploration Ltd.Co.,Beijing 102211,China
  • Received:2018-10-16 Revised:2018-12-28 Online:2019-05-10

摘要: 为评价保靖区块龙马溪组生气潜力和产能,完井后需要对该地区龙马溪组优质页岩进行可压裂性评价,为后期压裂改造和试气提供依据。借助研究区测井、录井、岩心化验数据的分析和处理,对保靖区块龙马溪组页岩储层特征和对岩石可压性影响的关键因素进行研究,获得对可压性有影响的正相关指标和负相关指标,采用相关性分析和层次分析法建立可定量评价研究区页岩储层可压裂性的数学模型,研究结果表明:龙马溪组储层具有有机质丰富、低孔低渗、脆性矿物含量高,杨氏模量较高,泊松比中等,地应力差小的特点,具备一定的页岩气勘探潜力和压裂改造条件,利用可压性系数,将研究区的页岩可压裂性分为3 个级别,即可压裂性差(可压裂系数为0.1~0.4)、可压裂性中等(可压裂系数为0.4~0.6)和可压裂性好(可压裂系数>0.6),应选择可压裂系数大于0.4 的页岩层进行水力压裂。运用可压裂系数模型计算研究区页岩储层的可压性中等,保页3井可压裂系数较高,是研究区页岩较理想的压裂候选井,保页1井可压性系数较低、压裂改造较为困难,评价结果与后期压裂施工效果较为吻合,研究成果可为今后页岩气、煤层气可压性定量评价和压裂施工提供借鉴。

关键词: 页岩气, 岩石力学, 脆性分析, 可压性, 压裂试气, 湖南保靖

Abstract: In order to evaluate the shale gas potential and productivity of the Longmaxi Formation in Baojing block,we need to evaluate the fracability of the Longmaxi Formation shale reservoir after completion,which can provide a reference for the future fracturing transformation and well test.Based on the analysis and processing of wireline logging,mud logging and core test data in the study area,we study the characteristics of the Longmaxi Formation shale reservoir in Baojing block and the key factors affecting the fracability of rock,obtaining the positive correlation index and the negative correlation index which have impact on fracability.A mathematical model for quantitative evaluation of the shale reservoir fracability in the study area is established based on the correlation analysis method and the analytic hierarchy process.The results show that the Longmaxi Formation shale reservoir has many characteristics,such as rich in organic matter,low porosity,low permeability,high brittle mineral content,high Young’s modulus,medium Poisson’s ratio,and small difference coefficient of ground stress,with certain shale gas exploration potential and fracturing conditions.Using the fracture index,the shale fracability of the area is divided into three levels,that is,the fracability is poor (the fracture index is 0.1-0.4),the fracability is medium (the fracture index is 0.4-0.6),and the fracability is good (fracture index > 0.6).Reservoir with a fracture index greater than 0.4 should be selected for hydraulic fracturing.The fracture index model is used to calculate the fracability of the shale reservoir in the study area.With high fracture index,the Well Baoye 3 is an ideal fracture candidate well for study area.While Well Baoye 1 fracture index is lower and the fracturing transformation is more difficult.The evaluation results are matched with the post-fracturing effect.The research results can provide reference for the quantitative evaluation and fracturing construction of shale gas and coalbed methane in the future.

Key words: Shale gas, Rock mechanics, Brittle analysis, Fracability, Fracturing & well test, Baojing block of Hunan Province

中图分类号: 

  • TE130
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