下寺湾油田长8致密油有效储层识别及地质“甜点”优选
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摘要
以下寺湾油田长8油藏试油、试采及生产数据为基础,识别在水平井加大规模体积压裂技术条件下能够开发的储层为有效储层,从岩心特征、岩屑气测综合录井特征、储层试验分析和测井响应特征等方面建立有效储层的识别标准。认为在现有技术条件下下寺湾油田能够开发的致密油储层为孔隙度大于8.5%、渗透率大于等于0.15mD的油迹级以上细砂岩。储层含油饱和度大于等于30%,测井响应声波时差大于等于222μs/m。全烃气测录井气测值为基线的5倍以上,电阻率达到32Ω·m以上,且压裂后可动用油层厚度达5.0m以上的识别为地质"甜点"区。地质"甜点"区的筛选按照先从致密油"三大控制因素"进行有利区带优选,然后用重新确定的有效储层下限标准进行"甜点"筛选,在油藏内部产能建设实施过程中按照含油性、油层的有效厚度及邻井实施效果排序,排除风险区,避免低效区。
We proposed criteria whereby tight oil wells can obtain industrial oil flow under the technical conditions of large-scale volume fracturing of horizontal wells based on the well test results and dynamic production data for Chang-8 tight oil reservoirs in Xiasiwan oilfield.The criteria were established using core observation,comprehensive logging characteristics of cuttings gas survey,reservoir analysis,and well-logging response.We found that the effective fine sandstone formation has porosity is equal or greater than 8.5%,and permeability is equal or greater than0.15 mD.In the"sweet spot"zone,the oil saturation of reservoir is equal or greater than 30%,the interval acoustic transit time in well logging is equal or greater than 222μs/m,the full hydrocarbon gas logging value is more than 5 times of the baseline,the resistivity is greater than 32Ω·m,and after fracturing,the thickness of usable oil layer is more than 5.0 m.Firstly,according to the"three major control factors"of tight oil reservoir,the favorable zone selection was carried out,and then the redefined effective reservoir lower limit standard is used to make"sweet spot"zone selection.During development,the oil saturation,the effective thickness of the reservoir and the effect of adjacent wells were considered for reducing the risk of low yield or low efficiency areas.
We proposed criteria whereby tight oil wells can obtain industrial oil flow under the technical conditions of large-scale volume fracturing of horizontal wells based on the well test results and dynamic production data for Chang-8 tight oil reservoirs in Xiasiwan oilfield.The criteria were established using core observation,comprehensive logging characteristics of cuttings gas survey,reservoir analysis,and well-logging response.We found that the effective fine sandstone formation has porosity is equal or greater than 8.5%,and permeability is equal or greater than0.15 mD.In the"sweet spot"zone,the oil saturation of reservoir is equal or greater than 30%,the interval acoustic transit time in well logging is equal or greater than 222μs/m,the full hydrocarbon gas logging value is more than 5 times of the baseline,the resistivity is greater than 32Ω·m,and after fracturing,the thickness of usable oil layer is more than 5.0 m.Firstly,according to the"three major control factors"of tight oil reservoir,the favorable zone selection was carried out,and then the redefined effective reservoir lower limit standard is used to make"sweet spot"zone selection.During development,the oil saturation,the effective thickness of the reservoir and the effect of adjacent wells were considered for reducing the risk of low yield or low efficiency areas.
引文
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[11]于波,周康,郭强,等.鄂尔多斯盆地吴定地区延长组下部油气成藏模式与主控因素[J].地质与勘探,2012,48(4):858-864.
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[13]张文正,杨华,傅锁堂,等.鄂尔多斯盆地长91湖相优质烃源岩的发育机制探讨[J].中国科学(D辑:地球科学),2007,37(S1):33-38.
[14]李相博,刘显阳,周世新,等.鄂尔多斯盆地延长组下组合油气来源及成藏模式[J].石油勘探与开发,2012,39(2):172-180.
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[16]张文正,杨华,李剑锋,等.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用:强生排烃特征及机理分析[J].石油勘探与开发,2006,33(3):289-293.
[17]张文正.论鄂尔多斯盆地长7优质油源岩在低渗透石油成藏富集中的主导作用Ⅱ:优质油源岩的生、排烃特征与排烃机理[A]//中国地质学会石油地质专业委员会.第十届全国有机地球化学学术会议论文摘要汇编[C].北京:中国地质学会,2005:2.
[18]赵靖舟.非常规油气有关概念、分类及资源潜力[J].天然气地球科学,2012,23(3):393-406.
[19]王香增,任来义,贺永红,等.鄂尔多斯盆地致密油的定义[J].油气地质与采收率,2016,23(1):1-7.
[20]GAO S L,YANG J X.Palaeostructure,evolution and tight oil distribution of the Ordos Basin,China[J/OL].Oil&Gas Science and Technology-Rev.IFP Energies nouvelles,2019,74(35)(2019-04-01)[2019-04-03].https://ogst.ifpenergiesnouvelles.fr/articles/ogst/abs/2019/01/ogst180267/ogst180267.html.DOI:https://doi.org/10.2516/ogst/2019010.
[21]李锦锋.下寺湾油气田延长组长7段页岩气藏浅析[J].复杂油气藏,2015,8(1):20-24.
[22]李锦锋.下寺湾油田长8段致密砂岩油藏成藏条件及有利发育区预测[J].石油地质与工程,2016(2):9-11,16,147.
[23]李锦锋,李磊,李晓宏,等.下寺湾油田延长组长9致密砂岩储层特征及主控因素分析[J].科技通报,2017(11):39-43.
[24]李锦锋,马腾,王津,等.下寺湾油田延长组长9段致密砂岩油藏成藏主控因素及有利勘探方向[J].油气藏评价与开发,2017(6):14-19.
[25]李锦锋,马永钊,王津,等.下寺湾油田延长组长9段致密砂岩油藏成藏条件及主控因素分析[J].新疆地质,2017(3):325-329.
[26]李得路,李荣西,赵卫卫,等.“准连续型”致密砂岩油藏地质特征及成藏主控因素分析:以鄂尔多斯盆地陇东地区长7油层组为例[J].兰州大学学报(自然科学版),2017,53(2):163-171.
[27]赵靖舟,白玉彬,曹青,等.鄂尔多斯盆地准连续型低渗透-致密砂岩大油田成藏模式[J].石油与天然气地质,2012,33(6):811-827.
[28]赵靖舟,付金华,姚泾利,等.鄂尔多斯盆地准连续型致密砂岩大气田成藏模式[J].石油学报,2012,33(S1):37-52.
[2]BRUCE J.Bakken black gold[N].Leader-Poster,2007-12-10(6).
[3]DECHONGKIT P,PRASAD M.Recovery factor and reserves estimation in the Bakken petroleum system(Analysis of the Antelope,Sanish and Parshall fields)[R].SPE 149471,2011:1-15.
[4]郭松伟,高霞,张克鑫,等.加拿大巴肯组“致密油”测井解释方法[J].非常规油气,2014,1(1):22-26.
[5]高世葵,董大忠,王红军,等.致密油基本特征与商业化勘探开发实践:以巴肯为例[J].非常规油气,2014,1(1):65-74.
[6]贾承造,邹才能,李建忠,等.中国致密油评价标准、主要类型、基本特征及资源前景[J].石油学报,2012,33(3):343-350.
[7]邹才能,张国生,杨智,等.非常规油气概念、特征、潜力及技术:兼论非常规油气地质学[J].石油勘探与开发,2013,40(4):385-399,454.
[8]屈红军,蒲仁海,曹金舟,等.鄂尔多斯盆地南部地区长7致密油储层特征[J].非常规油气,2015,2(1):1-9.
[9]姚泾利,邓秀芹,赵彦德,等.鄂尔多斯盆地延长组致密油特征[J].石油勘探与开发,2013,40(2):150-158.
[10]任战利,李文厚,梁宇,等.鄂尔多斯盆地东南部延长组致密油成藏条件及主控因素[J].石油与天然气地质,2014,35(2):190-198.
[11]于波,周康,郭强,等.鄂尔多斯盆地吴定地区延长组下部油气成藏模式与主控因素[J].地质与勘探,2012,48(4):858-864.
[12]张文正,杨华,李善鹏.鄂尔多斯盆地长91湖相优质烃源岩成藏意义[J].石油勘探与开发,2008,35(5):557-562,568.
[13]张文正,杨华,傅锁堂,等.鄂尔多斯盆地长91湖相优质烃源岩的发育机制探讨[J].中国科学(D辑:地球科学),2007,37(S1):33-38.
[14]李相博,刘显阳,周世新,等.鄂尔多斯盆地延长组下组合油气来源及成藏模式[J].石油勘探与开发,2012,39(2):172-180.
[15]张文正.鄂尔多斯盆地烃源岩研究新进展[A]//中国地质学会石油地质专业委员会.第十届全国有机地球化学学术会议论文摘要汇编[C].北京:中国地质学会,2005:4.
[16]张文正,杨华,李剑锋,等.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用:强生排烃特征及机理分析[J].石油勘探与开发,2006,33(3):289-293.
[17]张文正.论鄂尔多斯盆地长7优质油源岩在低渗透石油成藏富集中的主导作用Ⅱ:优质油源岩的生、排烃特征与排烃机理[A]//中国地质学会石油地质专业委员会.第十届全国有机地球化学学术会议论文摘要汇编[C].北京:中国地质学会,2005:2.
[18]赵靖舟.非常规油气有关概念、分类及资源潜力[J].天然气地球科学,2012,23(3):393-406.
[19]王香增,任来义,贺永红,等.鄂尔多斯盆地致密油的定义[J].油气地质与采收率,2016,23(1):1-7.
[20]GAO S L,YANG J X.Palaeostructure,evolution and tight oil distribution of the Ordos Basin,China[J/OL].Oil&Gas Science and Technology-Rev.IFP Energies nouvelles,2019,74(35)(2019-04-01)[2019-04-03].https://ogst.ifpenergiesnouvelles.fr/articles/ogst/abs/2019/01/ogst180267/ogst180267.html.DOI:https://doi.org/10.2516/ogst/2019010.
[21]李锦锋.下寺湾油气田延长组长7段页岩气藏浅析[J].复杂油气藏,2015,8(1):20-24.
[22]李锦锋.下寺湾油田长8段致密砂岩油藏成藏条件及有利发育区预测[J].石油地质与工程,2016(2):9-11,16,147.
[23]李锦锋,李磊,李晓宏,等.下寺湾油田延长组长9致密砂岩储层特征及主控因素分析[J].科技通报,2017(11):39-43.
[24]李锦锋,马腾,王津,等.下寺湾油田延长组长9段致密砂岩油藏成藏主控因素及有利勘探方向[J].油气藏评价与开发,2017(6):14-19.
[25]李锦锋,马永钊,王津,等.下寺湾油田延长组长9段致密砂岩油藏成藏条件及主控因素分析[J].新疆地质,2017(3):325-329.
[26]李得路,李荣西,赵卫卫,等.“准连续型”致密砂岩油藏地质特征及成藏主控因素分析:以鄂尔多斯盆地陇东地区长7油层组为例[J].兰州大学学报(自然科学版),2017,53(2):163-171.
[27]赵靖舟,白玉彬,曹青,等.鄂尔多斯盆地准连续型低渗透-致密砂岩大油田成藏模式[J].石油与天然气地质,2012,33(6):811-827.
[28]赵靖舟,付金华,姚泾利,等.鄂尔多斯盆地准连续型致密砂岩大气田成藏模式[J].石油学报,2012,33(S1):37-52.
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