The Novel Technology of Shale Gas Play Evaluation——Sweetness Calculation Method
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摘要: 在应用地质甜点与工程甜点对页岩气层产气能力进行评价时，只能表明页岩气层压后产气可能性的大小，而压后产气量的高低与该甜点指标的正相关性并不明显。为此，提出了地质甜度及工程甜度的概念，对地质甜点与工程甜点的“甜度”进行精确表征和量化，并给出了其计算方法：设置待评价区地质甜度及工程甜度最甜的标杆，即涵盖一系列最佳地质参数与工程参数的集合体，然后计算欧氏贴近度来表征待评价区参数集合与该标杆的相似度，并将其作为地质甜度与工程甜度，应用灰色关联方法确定地质甜度和工程甜度的权重分配后，可计算得到综合的甜度指标。涪陵页岩气田焦石坝区块7口井的验证结果表明，与地质甜点与工程甜点相比，地质甜度与工程甜度与各段簇产气量的正相关性更强。研究与应用表明，应用地质甜度与工程甜度可以实现页岩气层产气能力的定量评价，增强了页岩气水平井分段压裂段簇位置优选的科学性与可靠性，对页岩气开发的降本增效具有重要的现实意义。Abstract: The evaluation results of a shale gas play based on geologic and engineering sweet spots can only show the probability of gas production after shale gas fracturing, while the production capacity after fracturing has no significant positive correlation with the sweet spot indicator. For this reason, the concept of geologic and engineering sweetness is proposed and corresponding calculation method is also provided in order to develop a "sweetness index". It is necessary to set the benchmark for the highest geologic sweetness and engineering sweetness of the area to be evaluated, namely the collection of a series of optimum geological parameter combinations and engineering parameters, then to calculate the Euclid approach degree to indicate the similarity between the parameter combinations and the benchmark. Taking it as the geologic sweetness and engineering sweetness, we need to determine weighted distribution of geologic sweetness and engineering sweetness by means of grey correlation in order to obtain the aggregative sweetness indicator, or a "sweetness index". The concept was applied to seven wells in Jiaoshiba Block of Fuling Shale Gas Field and results showed that gas production of clusters from each segment has significant positive correlation with geologic sweetness and engineering sweetness. According to results of the study and applications, geologic sweetness and engineering sweetness can be used in the quantitative evaluation of the gas production capacity of a shale gas play, which improves rationality and reliability of segment cluster selection in staged fracturing of horizontal shale gas wells and results in significant cost reduction and effectiveness of shale gas fracturing.
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Keywords:
- shale gas /
- fracturing /
- geologic sweetness /
- engineering sweetness /
- fracturing design /
- Jiaoshiba Block /
- Fuling Shale Gas Field
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[1] 黄进,吴雷泽,游园,等.涪陵页岩气水平井工程甜点评价与应用[J].石油钻探技术,2016,44(3):16-20.HUANG Jin,WU Leize,YOU Yuan,et al.The evaluation and application of engineering sweet spots in a horizontal well in the Fuling Shale Gas Reservoir[J].Petroleum Drilling Techniques,2016,44(3):16-20. [2] 蒋廷学.页岩油气水平井压裂裂缝复杂性指数研究及应用展望[J].石油钻探技术,2013,41(2):7-12.JIANG Tingxue.The fracture complexity index of horizontal wells in shale oil and gas reservoirs[J].Petroleum Drilling Techniques,2013,41(2):7-12. [3] QUINN J B,QUINN G D.Indentation brittleness of ceramics:a fresh approach[J].Journal of Materials Science,1997,32(16):4331-4346.
[4] 蒋廷学,卞晓冰,苏瑗,等.页岩可压性指数评价新方法及应用[J].石油钻探技术,2014,42(5):16-20.JIANG Tingxue,BIAN Xiaobing,SU Yuan,et al.A new method for evaluating shale fracability index and its application[J].Petroleum Drilling Techniques,2014,42(5):16-20. [5] 王汉青,陈军斌,张杰,等.基于权重分配的页岩气储层可压性评价新方法[J].石油钻探技术,2016,44(3):88-94.WANG Hanqing,CHEN Junbin,ZHANG Jie,et al.A new method of fracability evaluation of shale gas reservoir based on weight allocation[J].Petroleum Drilling Techniques,2016,44(3):88-94. [6] HOWELL J V.Glossary of geology and related sciences[M].Washington:American Geological Institute,1957:99-102.
[7] JARVIE D.Finding bypassed or overlooked pay zones using geochemistry techniques[R].IPTC 12918,2008.
[8] WANG F P,REED R M.Pore networks and fluid flow in gas shales[R].SPE 124253,2009.
[9] RICKMAN R,MULLEN M J,PETRE J E,et al.A practical use of shale petrophysics for stimulation design optimization:all shale plays are not clones of the Barnett Shale[R].SPE 115258,2008.
[10] 蒋廷学,卞晓冰,王海涛,等.页岩气水平井分段压裂排采规律研究[J].石油钻探技术,2013,41(5):21-25.JIANG Tingxue,BIAN Xiaobing,WANG Haitao,et al.Flow back mechanism study of multi-stage fracturing of shale gas horizontal wells[J].Petroleum Drilling Techniques,2013,41(5):21-25. [11] 杨建,付永强,陈鸿飞,等.页岩储层的岩石力学特征[J].天然气工业,2012,32(7):12-14.YANG Jian,FU Yongqiang,CHEN Hongfei,et al.Rock mechanical characteristics of shale reservoirs[J].Natural Gas Industry,2012,32(7):12-14. [12] 李庆辉,陈勉,金衍,等.页岩气储层岩石力学特性及脆性评价[J].石油钻探技术,2012,40(4):17-22.LI Qinghui,CHEN Mian,JIN Yan,et al.Rock mechanical properties and brittleness evaluation of shale gas reservoir[J].Petroleum Drilling Techniques,2012,40(4):17-22. [13] 李庆辉,陈勉,金衍,等.页岩脆性的室内评价方法及改进[J].岩石力学与工程学报,2012,31(8):1680-1685.LI Qinghui,CHEN Mian,JIN Yan,et al.Indoor evaluation method for shale brittleness and improvement[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(8):1680-1685. [14] 蒋廷学,卞晓冰,袁凯,等.页岩气水平井分段压裂优化设计新方法[J].石油钻探技术,2014,42(2):1-6.JIANG Tingxue,BIAN Xiaobing,YUAN Kai,et al.A new method in staged fracturing design optimization for shale gas horizontal wells[J].Petroleum Drilling Techniques,2014,42(2):1-6. [15] 卞晓冰,蒋廷学,贾长贵,等.基于施工曲线的页岩气井压后评估新方法[J].天然气工业,2016,36(2):60-65.BIAN Xiaobing,JIANG Tingxue,JIA Changgui,et al.A new post-fracturing evaluation method for shale gas wells based on fracturing curves[J].Natural Gas Industry,2016,36(2):60-65.
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