基于层次分析法的页岩气储层可压裂性评价研究
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摘要
为评价页岩气储层的可压裂性,提高页岩气开发过程中压裂层段选取的经济有效性,首先利用岩心分析化验资料与测井资料综合研究脆性指数、脆性矿物含量、有机碳含量、黏土矿物、断裂韧度和水平应力差异系数等因素对页岩气储层可压裂性的影响;然后对正向、负向可压裂性评价参数进行归一化处理,并采用层次分析法建立了页岩气储层可压裂性评价模型;最后利用贵州岑巩地区牛蹄塘组页岩气井压裂层段微地震资料进行验证分析和压裂分级评价。结果表明:当有机碳含量小于7%时,可压裂指数变大,可压裂性增强,有机碳含量大于7%时,页岩的构造裂缝不发育,可压裂指数变小,可压裂性变差;脆性指数及脆性矿物含量与可压裂指数呈正相关性,黏土矿物含量和断裂韧度则与可压裂指数呈负相关性,水平应力差异系数与可压裂指数没有明显的相关性。基于层次分析法建立的可压裂性评价模型能够较为准确地识别不同储层段的可压裂性,为页岩气储层可压裂性评价提供了新思路。
The shale gas reservoir crushability is evaluated to improve the economic benefit of fracturing intervals in shale gas development.Firstly,the core analysis and logging data are comprehensively used to analyze the effects of brittleness index,brittle mineral content,organic carbon content,clay minerals,fracture toughness,and horizontal stress difference coefficient on the crushability of shale gas reservoir.Then,the normal and negative crushability evaluation parameters are normalized and a shale gas reservoir crushability evaluation model is established by adopting the analytic hierarchy process.Finally,the microseismic data of the fracturing intervals in the shale gas well of the Niutitang Formation in the Cengong of Guizhou are used for verification analysis and crushability evaluation.Result shows that the crushability index increases when the organic carbon content is less than 7%.When the organic carbon content is more than 7%,the less developed structural fracture results in lower crushability index.The brittleness index and brittle mineral content are positively related to the crushability index.However,the clay mineral content and fracture toughness are negatively correlated with the crushability index.There is no significant correlation between the horizontal stress difference coefficient and the crushability index.The crushability evaluation model based on the analytic hierarchy process(AHP) could accurately identify the crushability of different reservoir intervals,which could provide new ideas for the crushability evaluation of shale gas reservoir.
The shale gas reservoir crushability is evaluated to improve the economic benefit of fracturing intervals in shale gas development.Firstly,the core analysis and logging data are comprehensively used to analyze the effects of brittleness index,brittle mineral content,organic carbon content,clay minerals,fracture toughness,and horizontal stress difference coefficient on the crushability of shale gas reservoir.Then,the normal and negative crushability evaluation parameters are normalized and a shale gas reservoir crushability evaluation model is established by adopting the analytic hierarchy process.Finally,the microseismic data of the fracturing intervals in the shale gas well of the Niutitang Formation in the Cengong of Guizhou are used for verification analysis and crushability evaluation.Result shows that the crushability index increases when the organic carbon content is less than 7%.When the organic carbon content is more than 7%,the less developed structural fracture results in lower crushability index.The brittleness index and brittle mineral content are positively related to the crushability index.However,the clay mineral content and fracture toughness are negatively correlated with the crushability index.There is no significant correlation between the horizontal stress difference coefficient and the crushability index.The crushability evaluation model based on the analytic hierarchy process(AHP) could accurately identify the crushability of different reservoir intervals,which could provide new ideas for the crushability evaluation of shale gas reservoir.
引文
[1]袁俊亮,邓金根,张定宇,等.页岩气储层可压裂性评价技术[J].石油学报,2013,34(3):523-527.
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[11]王濡岳,龚大建,丁文龙,等.上扬子地区下寒武统牛蹄塘组页岩储层脆性评价:以贵州岑巩区块为例[J].地学前缘,2016,23(1):87-95.
[12]冷济高,龚大建,李飞,等.黔东北地区牛蹄塘组页岩气勘探前景分析[J].地学前缘,2016,23(2):29-38.
[13]唐颖,邢云,李乐忠,等.页岩储层可压裂性影响因素及评价方法[J].地学前缘,2012,19(5):356-363.
[14]隋丽丽,杨永明,杨文光,等.胜利油田东营凹陷区页岩可压裂性评价[J].煤炭学报,2015,40(7):1588-1594.
[15]陈江湛,曹函,孙平贺,等.湘西北牛蹄塘组页岩可压裂性评价[J].地学前缘,2017,24(6):390-398.
[16]姜宝益,李治平,蔡喜东,等.基于模糊层次分析法的油藏渗吸潜力评价方法[J].特种油气藏,2012,19(6):81-84.
[17]SAATY Thomas L.层次分析法——在资源分配、管理和冲突分析中的应用[M].北京:煤炭工业出版社,1988:45-49
[18]张军华,黄广谭,李军,等.基于层次分析法的地震有利储层预测[J].特种油气藏,2015,22(5):23-27.
[19]徐东晶,牛超,相诗尧,等.AHP-Fisher判别法在工作面安全开采评价中的应用[J].煤炭技术,2016,35(10):18-20.
[20]王濡岳,丁文龙,龚大建,等.渝东南—黔北地区下寒武统牛蹄塘组页岩裂缝发育特征与主控因素[J].石油学报,2016,37(7):832-845.
[2]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):88-994.
[3]盛秋红,李文成.泥页岩可压性评价方法及其在焦石坝地区的应用[J].地球物理学进展,2016,31(4):1473-1479.
[4]杨宏伟,李军,柳贡慧,等.基于测井数据的页岩可压性定量评价[J].断块油气田,2017,24(3):382-386.
[5]JARVIE D M,HILL R J,RUBLE T E,et al.Unconventional shale-gas systems:the Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment[J].AAPG Bulletin,2007,91(4):475-499.
[6]BREYER J A,ALSLEBEN H,ENDERLIN M B.Predicting Fracability in Shale Reservoirs[C/OL].[2012-08-10].http://www.Searchanddiscovery.com/abstracts/pdf/2011/hedberg-texas/abstraces/ndx_breyer.pdf.
[7]MULLEN M J,ENDERLIN M B.Fracability index more than just calculating rock properties[C].SPE159755,2012:2-8.
[8]蒋廷学,卞晓冰,苏媛,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.
[9]赵金洲,许文俊,李勇明,等.页岩气储层可压性评价新方法[J].天然气地球科学,2015,26(6):1165-1172.
[10]王建波,冯明刚,严伟,等.焦石坝地区页岩储层可压裂性影响因素及计算方法[J].断块油气田,2016,23(2):216-220.
[11]王濡岳,龚大建,丁文龙,等.上扬子地区下寒武统牛蹄塘组页岩储层脆性评价:以贵州岑巩区块为例[J].地学前缘,2016,23(1):87-95.
[12]冷济高,龚大建,李飞,等.黔东北地区牛蹄塘组页岩气勘探前景分析[J].地学前缘,2016,23(2):29-38.
[13]唐颖,邢云,李乐忠,等.页岩储层可压裂性影响因素及评价方法[J].地学前缘,2012,19(5):356-363.
[14]隋丽丽,杨永明,杨文光,等.胜利油田东营凹陷区页岩可压裂性评价[J].煤炭学报,2015,40(7):1588-1594.
[15]陈江湛,曹函,孙平贺,等.湘西北牛蹄塘组页岩可压裂性评价[J].地学前缘,2017,24(6):390-398.
[16]姜宝益,李治平,蔡喜东,等.基于模糊层次分析法的油藏渗吸潜力评价方法[J].特种油气藏,2012,19(6):81-84.
[17]SAATY Thomas L.层次分析法——在资源分配、管理和冲突分析中的应用[M].北京:煤炭工业出版社,1988:45-49
[18]张军华,黄广谭,李军,等.基于层次分析法的地震有利储层预测[J].特种油气藏,2015,22(5):23-27.
[19]徐东晶,牛超,相诗尧,等.AHP-Fisher判别法在工作面安全开采评价中的应用[J].煤炭技术,2016,35(10):18-20.
[20]王濡岳,丁文龙,龚大建,等.渝东南—黔北地区下寒武统牛蹄塘组页岩裂缝发育特征与主控因素[J].石油学报,2016,37(7):832-845.