四川盆地涪陵平桥页岩气田五峰组——龙马溪组页岩气富集主控因素
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摘要
涪陵平桥页岩气田位于四川盆地涪陵凤来复向斜内的"窄陡型"断背斜构造上,目前五峰组—龙马溪组产层探明页岩气地质储量为1 389.17×10~8 m~3,揭示该气田具有良好的勘探开发前景。利用现有的钻井、测井、地震及分析化验测试资料,研究了涪陵平桥"窄陡型"断背斜页岩气田的基本特征,分析了页岩气富集高产主控因素和单井产量差异原因。研究表明:(1)平桥页岩气田气层(TOC≥1%)的累计厚度介于115～155m之间,底部优质页岩层段(TOC≥3%)厚度介于36～40m之间,气田具有储量丰度高(储量丰度为12.68×10~8 m~3/km~2)、气藏压力高(压力系数为1.56)、气井产量高(平均测试产量为21.99×10~4 m~3/d)的"三高"特点;(2)深水陆棚相优质页岩发育、断裂不通天、走滑性质弱、封堵性好且周边无露头等明显泄压区,是页岩气田富集高产的主控因素;(3)在页岩气层富集条件相似时,微裂缝发育程度、构造位置和埋深是单井产量平面差异的关键因素。
Pingqiao shale gas field in Fuling area,located in the fault anticline of Fenglai Syncline,has a narrow-abrupt slope belt.The proved geological reserves are 1 389.17×10~8m~3 in the Wufeng-Longmaxi Formations,suggesting Pingqiao shale gas field possesses good potential for shale gas exploration.In order to study the features,major factors controlling the accumulation and high productivity and the reasons for production variance from different wells in Pingqiao shale gas field,the article makes a detail analyses of Pingqiao shale gas field based on drilling,logging,seismic and experimental data.The results show that:(1)The thickness of Pingqiao shale gas layer(TOC ≥1%)is 115-155m;the thickness of quality layer(TOC≥3%)at the bottom is 36-40 m,the shale gas is featured by high reserves(reserve abundance 12.68×10~8m~3/km~2),high pressure of shale gas accumulation(pressure ratio 1.56),high production of wells(average testing production 21.99×10~4m~3/d).(2)Deep shelf quality shales and the faults showing weak slipping,good sealing and no pressure-leaking area are found in surrounding area,being the main controlling factor to shale gas accumulating and high production in Pingqiao shale gas field.(3)Micro-fractures,structural location and depth are also key factors for various productions of wells in Pingqiao shale gas field under the similar accumulating circumstances.
Pingqiao shale gas field in Fuling area,located in the fault anticline of Fenglai Syncline,has a narrow-abrupt slope belt.The proved geological reserves are 1 389.17×10~8m~3 in the Wufeng-Longmaxi Formations,suggesting Pingqiao shale gas field possesses good potential for shale gas exploration.In order to study the features,major factors controlling the accumulation and high productivity and the reasons for production variance from different wells in Pingqiao shale gas field,the article makes a detail analyses of Pingqiao shale gas field based on drilling,logging,seismic and experimental data.The results show that:(1)The thickness of Pingqiao shale gas layer(TOC ≥1%)is 115-155m;the thickness of quality layer(TOC≥3%)at the bottom is 36-40 m,the shale gas is featured by high reserves(reserve abundance 12.68×10~8m~3/km~2),high pressure of shale gas accumulation(pressure ratio 1.56),high production of wells(average testing production 21.99×10~4m~3/d).(2)Deep shelf quality shales and the faults showing weak slipping,good sealing and no pressure-leaking area are found in surrounding area,being the main controlling factor to shale gas accumulating and high production in Pingqiao shale gas field.(3)Micro-fractures,structural location and depth are also key factors for various productions of wells in Pingqiao shale gas field under the similar accumulating circumstances.
引文
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[22] Wei Zhihong.Late fugitive emission of shale gas from WufengLongmaxi Formation in Sichuan Basin and its periphery[J].Oil&Gas Geology,2015,36(4):659-665.魏志红.四川盆地及其周缘五峰组-龙马溪组页岩气的晚期逸散[J].石油与天然气地质,2015,36(4):659-665.
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[2] Guo Xusheng,Hu Dongfeng,Wei Zhihong,et al.Discovery and exploration of Fuling shale gas field[J].China Petroleum Exploration,2016,21(3):24-37.郭旭升,胡东风,魏志红,等.涪陵页岩气田的发现与勘探认识[J].中国石油勘探,2016,21(3):24-37.
[3] Wang Zhigang.Practice and cognition of shale gas horizontal well fracturing stimulation in Jiaoshiba of Fuling area[J].Oil&Gas Geology,2014,35(3):425-430.王志刚.涪陵焦石坝地区页岩气水平井压裂改造实践与认识[J].石油与天然气地质,2014,35(3):425-430.
[4] Ma Xinhua,Xie Jun.The progress and prospects of shale gas exploration and exploitation in southern Sichuan Basin,NW China[J].Petroleum Exploration and Development,2018,45(1):161-169.马新华,谢军.川南地区页岩气勘探开发进展及发展前景[J].石油勘探与开发,2018,45(1):161-169.
[5] Liang Xing,Wang Gaocheng,Zhang Jiehui,et al.High-efficiency integrated shale gas development model of Zhaotong National Demonstration Zone and its practical enlightenment[J].China Petroleum Exploration,2017,22(1):29-37.梁兴,王高成,张介辉,等.昭通国家级示范区页岩气一体化高效开发模式及实践启示[J].中国石油勘探,2017,22(1):29-37.
[6] Liu Naizhen,Wang Guoyong.Shale gas sweet spot identification and precise geo-steering drilling in Weiyuan block of Sichuan Basin,SW China[J].Petroleum Exploration and Development,2016,43(6):978-985.刘乃震,王国勇.四川盆地威远区块页岩气甜点厘定与精准导向钻井[J].石油勘探与开发,2016,43(6):978-985.
[7] Guo Xusheng.Rules of two-factor enrichment for marine shale gas in southern China:Understanding from the Longmaxi Formation shale gas in Sichuan Basin and its surrounding area[J].Acta Geologica Sinica,2014,88(7):1209-1218.郭旭升.南方海相页岩气“二元富集”规律——四川盆地及周缘龙马溪组页岩气勘探实践认识[J].地质学报,2014,88(7):1209-1218.
[8] Guo Xusheng,Hu Dongfeng,Wen Zhidong,et al.Major factors controlling the accumulation and high productivity in marine shale gas in the Lower Paleozoic of Sichuan Basin and its periphery:A case study of the Wufeng-Longmaxi Formation of Jiaoshiba area[J].Geology in China,2014,41(3):893-901.郭旭升,胡东风,文治东,等.四川盆地及周缘下古生界海相页岩气富集高产主控因素:以焦石坝地区五峰组—龙马溪组为例[J].中国地质,2014,41(3):893-901.
[9] Guo Xusheng,Hu Dongfeng,Li Yuping,et al.Geological factors controlling shale gas enrichment and high production in Fuling shale gas field[J].Petroleum Exploration and Development,2017,44(4):481-491.郭旭升,胡东风,李宇平,等.涪陵页岩气田富集高产主控地质因素[J].石油勘探与开发,2017,44(4):481-491.
[10] Guo Tonglou,Zhang Hanrong.Formation and enrichment mode of Jiaoshiba shale gas field,Sichuan Basin[J].Petroleum Exploration and Development,2014,41(1):28-36.郭彤楼,张汉荣.四川盆地焦石坝页岩气田形成与富集高产模式[J].石油勘探与开发,2014,41(1):28-36.
[11] Zhao Wenzhi,Li Jianzhong,Yang Tao,et al.Geological difference and its significance of marine shale gases in South China[J].Petroleum Exploration and Development,2016,43(4):499-510.赵文智,李建忠,杨涛,等.中国南方海相页岩气成藏差异性比较与意义[J].石油勘探与开发,2016,43(4):499-510.
[12] Zou Caineng,Dong Dazhong,Wang Yuman,et al.Shale gas in China:Characteristics,challenges and prospects(I)[J].Petroleum Exploration and Development,2015,42(6):689-701.邹才能,董大忠,王玉满,等.中国页岩气特征、挑战及前景(一)[J].石油勘探与开发,2015,42(6):689-701.
[13] He Zhiliang,Hu Zongquan,Nie Haikuan,et al.Characterization of shale gas enrichment in the Wufeng-Longmaxi Formation in the Sichuan Basin and its evaluation of geological construction-trans formation evolution sequence[J].Natural Gas Geoscience,2017,28(5):724-733.何治亮,胡宗全,聂海宽,等.四川盆地五峰组—龙马溪组页岩气富集特征与“建造—改造”评价思路[J].天然气地球科学,2017,28(5):724-733.
[14] Zeng Yijin.Integration technology of geology&engineering for shale gas development[J].Petroleum Drilling Techniques,2014,42(1):1-6.曾义金.页岩气开发的地质与工程一体化技术[J].石油钻探技术,2014,42(1):1-6.
[15] Zhao Jinzhou,Fu Dongyu,Li Yongming,et al.Analysis of sensitive factors about multistage fractured well productivity in shale gas reservoirs based on modified trilinear flow model[J].Natural Gas Geoscience,2016,27(7):1324-1331.赵金洲,符东宇,李勇明,等.基于改进三线性流模型的多级压裂页岩气井产能影响因素分析[J].天然气地球科学,2016,27(7):1324-1331.
[16] Hu Xiaolan.Practice of directional technology for shale gas horizontal wells in Fuling[J].Journal of Oil and Gas Technology,2014,36(11):130-133.胡小兰.涪陵页岩气水平井定向工艺技术实践[J].石油天然气学报,2014,36(11):130-133.
[17] Wu Wei,Xie Jun,Shi Xuewen,et al.Accumulation condition and exploration potential for Wufeng-Longmaxi shale gas in Wuxi area,northeastern Sichuan Basin[J].Natural Gas Geoscience,2017,28(5):734-743.吴伟,谢军,石学文,等.川东北巫溪地区五峰组—龙马溪组页岩气成藏条件与勘探前景[J].天然气地球科学,2017,28(5):734-743.
[18] Liu Ruobing,Li Yuping,Wang Qiang,et al.Analyses on influences on shale reservoirs of Wufeng-Longmaxi Formation by overpressure in south-eastern part of Sichuan Basin[J].Acta Sedimentologica Sinica,2015,33(4):817-827.刘若冰,李宇平,王强,等.超压对川东南地区五峰组—龙马溪组页岩储层影响分析[J].沉积学报,2015,33(4):817-827.
[19] Liang Xing,Wang Gaocheng,Xu Zhengyu,et al.Comprehensive evaluation technology for shale gas sweet spots in the complex marine mountains,South China:A case study from Zhaotong national shale gas demonstration zone[J].Natural Gas Industry,2016,36(1):33-42.梁兴,王高成,徐政语,等.中国南方海相复杂山地页岩气储层甜点综合评价技术[J].天然气工业,2016,36(1):33-42.
[20] Tang Xianglu,Jiang Zhenxue,Zhang Yingying,et al.Causes leading to difference of different well blocks in southeastern Chongqing in shale gas enrichment[J].Journal of Xi’an Shiyou University:Natural Science Edition,2015,30(3):24-35.唐相路,姜振学,张莺莺,等.渝东南地区页岩气富集区差异性分布成因[J].西安石油大学学报:自然科学版,2015,30(3):24-35.
[21] Hu Dongfeng,Zhang Hanrong,Ni Kai,et al.Main controlling factors for gas preservation conditions of marine shales in southeastern margins of the Sichuan Basin[J].Natural Gas Industry,2014,34(6):17-23.胡东风,张汉荣,倪楷,等.四川盆地东南缘海相页岩气保存条件及其主控因素[J].天然气工业,2014,34(6):17-23.
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