渝东北地区下古生界页岩气聚集条件及资源潜力
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摘要
为了系统研究渝东北地区下寒武统水井沱组和上奥陶统五峰组—下志留统龙马溪组页岩气聚集条件,利用野外露头观测、实验测试分析、概率统计等多种方法,分别对2套页岩的分布、有机地球化学特征、储集条件及含气性进行了全面分析。结果表明:2套页岩均具有有机碳(TOC)含量高、成熟度高、厚度适中、有机质类型以腐泥型干酪根为主、含气量较高的特征;2套页岩均夹有薄层粉砂岩、细砂岩,富含石英、长石等碎屑组分,易于破裂形成裂缝、微裂缝,为页岩气的聚集提供了有利的物质基础及储集空间;2套页岩均对甲烷具有较强的吸附能力,现场解析平均含气质量体积分别为1.07 m~3/t和2.30 m~3/t。在此基础上,进一步确定了2套页岩有利区分布面积,采用条件概率体积法对其资源潜力分别进行了评价,得出下寒武统水井沱组和上奥陶统五峰组—下志留统龙马溪组页岩气资源量分别为0.42万亿m~3和0.38万亿m~3,均具有良好的页岩气勘探前景,城口地区的明中—厚坪一带和巫溪地区的咸水—文峰—大同一带均可作为渝东北地区页岩气勘探的有利区域。
In order to evaluate Paleozoic shale gas potential in northeastern Chongqing,based on the methods of filed outcrops survey,experimental test and mathematical statistics,the distribution,source rock and reservoir conditions of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng-Longmaxi Formation were comprehensively analyzed.These shale rocks are characterized by high organic carbon content,high maturity,appropriate thickness and mainly type I kerogen.The results of field shale desorption show that the average gas content is 1.07 m~3/t and 2.30 m~3/t respectively.The siltstone and fine sandstone are easy for fracturing due to more quartz and other detrital components.These characteristics provide a favorable material basis and reservoir space for shale gas accumulation.Evaluated with conditional probability volume method,the shale gas resources of Shuijingtuo Formation and Wufeng-Longmaxi Formation are 0.42×10~(12)m~3 and 0.38×10~(12)m~3 respectively.Chengkou and Wuxi should be favorable areas for shale gas exploration in the northeastern Chongqing.
In order to evaluate Paleozoic shale gas potential in northeastern Chongqing,based on the methods of filed outcrops survey,experimental test and mathematical statistics,the distribution,source rock and reservoir conditions of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng-Longmaxi Formation were comprehensively analyzed.These shale rocks are characterized by high organic carbon content,high maturity,appropriate thickness and mainly type I kerogen.The results of field shale desorption show that the average gas content is 1.07 m~3/t and 2.30 m~3/t respectively.The siltstone and fine sandstone are easy for fracturing due to more quartz and other detrital components.These characteristics provide a favorable material basis and reservoir space for shale gas accumulation.Evaluated with conditional probability volume method,the shale gas resources of Shuijingtuo Formation and Wufeng-Longmaxi Formation are 0.42×10~(12)m~3 and 0.38×10~(12)m~3 respectively.Chengkou and Wuxi should be favorable areas for shale gas exploration in the northeastern Chongqing.
引文
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[7]闫建平,崔志鹏,耿斌,等.四川盆地龙马溪组与大安寨段泥页岩差异性分析.岩性油气藏,2016,28(4):16-23.YAN J P,CUI Z P,GENG B,et al.Differences of shale between Longmaxi Formation and Da’anzhai member in Sichuan Basin.Lithologic Reservoirs,2016,28(4):16-23.
[8]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.地学前缘,2016,23(2):29-38.LENG J G,GONG D J,LI F,et al.Analyses on the shale gas exploration prospect of the Niutitang Formation in north-eastern Guizhou area.Earth Science Frontiers,2016,23(2):29-38.
[9]罗健,戴鸿鸣,邵隆坎,等.四川盆地下古生界页岩气资源前景预测.岩性油气藏,2012,24(4):70-74.LUO J,DAI H M,SHAO L K,et al.Prospect prediction for shale gas resources of the Lower Paleozoic in Sichuan Basin.Lithologic Reservoirs,2012,24(4):70-74.
[10]聂海宽,张金川,李玉喜.四川盆地及其周缘下寒武统页岩气聚集条件.石油学报,2011,32(6):959-967.NIE H K,ZHANG J C,LI Y X.Accumulation conditions of the Lower Cambrian shale gas in the Sichuan Basin and its periphery.Acta Petrolei Sinica,2011,32(6):959-967.
[11]李可,王志兴,张馨艺,等.四川盆地东部下志留统龙马溪组页岩储层特征及影响因素.岩性油气藏,2016,28(5):52-58.LI K,WANG Z X,ZHANG X Y,et al.Shale reservoir characteristics and influencing factors of the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin.Lithologic Reservoirs,2016,28(5):52-58.
[12]周文,徐浩,余谦,等.四川盆地及其周缘五峰组—龙马溪组与筇竹寺组页岩气含气性差异及成因.岩性油气藏,2016,28(5):18-25.ZHOU W,XU H,YU Q,et al.Shale gas-bearing property differences and their genesis between Wufeng-Longmaxi Formation and Qiongzhusi Formation in Sichuan Basin and surrounding areas.Lithologic Reservoirs,2016,28(5):18-25.
[13]龙鹏宇,张金川,李玉喜,等.重庆及其周缘地区下古生界页岩气成藏条件及有利区预测.地学前缘,2013,19(2):221-233.LONG P Y,ZHANG J C,LI Y X,et al.Reservoir-forming conditions and strategic select favorable area of shale gas in the Lower Paleozoic of Chongqing and its adjacent areas.Earth Science Frontiers,2013,19(2):221-233.
[14]武瑾,梁峰,拜文华,等.渝东北地区下志留统龙马溪组页岩气勘探前景.特种油气藏,2015,22(6):50-55.WU J,LIANG F,BAI W H,et al.Exploration prospect of Lower Silurian Longmaxi Formation shale gas in northeastern Chongqing city.Special Oil and Gas Reservoirs,2015,22(6):50-55.
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[16]张金川,薛会,张德明,等.页岩气及其成藏机理.现代地质,2003,17(4):466.ZHANG J C,XUE H,ZHANG D M,et al.Shale gas and its accumulation mechanism.Geoscience,2003,17(4):466.
[17]张小龙,张同伟,李艳芳,等.页岩气勘探和开发进展综述.岩性油气藏,2013,25(2):116-122.ZHANG X L,ZHANG T W,LI Y F,et al.Research advance in exploration and development of shale gas.Lithologic Reservoirs,2013,25(2):116-122.
[18]聂海宽,唐玄,边瑞康.页岩气成藏控制因素及中国南方页岩气发育有利条件预测.石油学报,2009,30(4):484-491.NIE H K,TANG X,BIAN R K.Controlling factors for shale gas accumulation and prediction of potential development area in shale gas reservoir of South China.Acta Petrolei Sinica,2009,30(4):484-491.
[19]ROSS D J K,BUSTIN R M.Impact of mass balance calculations on adsorption capacities in microporous shale gas reservoirs.Fuel,2007,86(17):2696-2706.
[20]中国地质调查局油气资源调查中心.重庆城口区块页岩气形成富集条件与资源潜力.页岩气动态,2016,(9):15-22.Oil and Gas Survey Center of China Geological Survey.Shale gas accumulation conditions and it’s resource potential in Chenkou block,Chongqing.Shale Gas Dynamic,2016,(9):15-22.
[21]余川,程礼军,曾春林,等.渝东北地区下古生界页岩含气性主控因素分析.断块油气田,2014,21(3):296-300.YU C,CHENG L J,ZENG C L,et al.Main controlling factor analysis on gas-bearing property of Lower Paleozoic shale in northeastern Chongqing Region.Fault-Block Oil&Gas Field.2014,21(3):296-300.
[22]梁峰,拜文华,邹才能,等.渝东北地区巫溪2井页岩气富集模式及勘探意义.石油勘探与开发,2016,43(3):350-358.LIANG F,BAI W H,ZOU C N,et al.Shale gas enrichment pattern and exploration significance of well Wuxi-2 in northeast Chongqing,NE Sichuan Basin.Petroleum Exploration and Development,2016,43(3):350-358.
[23]付常青,朱炎铭,陈尚斌,等.渝东北地区WX2井页岩气赋存特征及其勘探指示意义.高校地质学报,2016,22(4):679-689.FU C Q,ZHU Y M,CHEN S B,et al.Shale gas occurrence characteristics and exploration significance of WX2 well in the northeast Chongqing.Geological Journal of China Universities,2016,22(4):679-689.
[24]李新景,吕宗刚,董大忠,等.北美页岩气资源形成的地质条件.天然气工业,2009,29(5):27-32.LI X J,LYU Z G,DONG D Z,et al.Geologic controls on accumulation of shale gas in north America.Natural Gas Industry,2009,29(5):27-32.
[25]李玉喜,聂海宽,龙彭宇.我国富含有机质泥页岩发育特点与页岩气战略选区.天然气工业,2009,29(12):115-118.LI Y X,NIE H K,LONG P Y.Development characteristic of organic-rich shale and the strategic selection of shale gas in China.Natural Gas Industry,2009,29(12):115-118.
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