四川盆地长宁—威远页岩气示范区下志留统龙马溪组泥页岩吸附特征及影响因素分析
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摘要
针对四川盆地长宁—威远页岩气示范区志留系龙马溪组泥页岩吸附气量大(70%~80%)的特性,对该页岩气区11口井龙马溪组优质页岩段的岩心样品作X射线衍射分析、扫描电镜和等温吸附分析测试,结合大量泥页岩含气量实测数据,统计分析及评价表明:研究区地层因素中,生烃条件如总有机碳含量(0.17%~4.3%)、有机质类型(Ⅰ、Ⅱ1型)和成熟度(2.4%~3.0%),以及储层条件如矿物成分、孔隙体积(3%~6%)、孔隙结构(中孔为主)和湿度,主要是通过改变页岩气生成量和吸附活性表面的大小而产生影响;外部因素如温度和压力主要是通过改变气体分子的活化能和结合能而对泥页岩吸附能力产生一定的影响。
According to rock analysis of X- ray diffraction, scanning electron microscopy and isothermal adsorption experiments on Lower Silurian Longmaxi shale cores samples from 11 gas wells in Changning-Weiyuan area in the southern part of Sichuan Basin, the adsorptivity and its influential factors are statistically analyzed. Combined with a large number of measured data of gas content in shale, it is shown that stratigraphic factors commonly exert their influences on adsorption through changing the gas generation amount and the extent of adsorbing active surface area in shale. The stratigraphic factors mainly include hydrocarbon generation conditions such as TOC(0.17%~4.3%), type of organic matter(Type-Ⅰor Type-Ⅱ1) and maturity(2.4%~3.0%), and reservoir conditions such as mineral composition, pore volume(3.0%~6.0%) and structure(mostly mesopores) and humidity. External factors, such as pressure and temperature, exert their definite influences on the adsorption capacity of Longmaxi shale through changing activation energy and binding energy of gas moleculars.
According to rock analysis of X- ray diffraction, scanning electron microscopy and isothermal adsorption experiments on Lower Silurian Longmaxi shale cores samples from 11 gas wells in Changning-Weiyuan area in the southern part of Sichuan Basin, the adsorptivity and its influential factors are statistically analyzed. Combined with a large number of measured data of gas content in shale, it is shown that stratigraphic factors commonly exert their influences on adsorption through changing the gas generation amount and the extent of adsorbing active surface area in shale. The stratigraphic factors mainly include hydrocarbon generation conditions such as TOC(0.17%~4.3%), type of organic matter(Type-Ⅰor Type-Ⅱ1) and maturity(2.4%~3.0%), and reservoir conditions such as mineral composition, pore volume(3.0%~6.0%) and structure(mostly mesopores) and humidity. External factors, such as pressure and temperature, exert their definite influences on the adsorption capacity of Longmaxi shale through changing activation energy and binding energy of gas moleculars.
引文
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[16]范文斐,侯读杰,梁钰.中国南方页岩气牛蹄塘组与龙马溪组成藏条件对比研究——以渝东南地区为例[J].科学技术与工程,2015,15(27):13-22.
[17]杨宝刚,潘仁芳,赵丹,等.四川盆地长宁示范区龙马溪组页岩岩石力学特性及脆性评价[J].地质科技情报,2015,34(4):183-188.
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[20]Zhao Hank.Thermal maturation and physical properties of Barnett Shale in Fort Worth Basin,North Texas[C]//AAPG Annual Meeting Program Abstracts,2004,13:154.
[21]Raut U,Fama M,Teolis B D,et al.Characterization of porosity in vapor deposited amorphous solid water from methane adsorption[J].The Journal of Chemical Physics,2007,127(20):1-6.
[22]Javadpour F,Fisher D,Unsworth M.Nanoscale gas flow in shale gas sediments[J].Journal of Canadian Petroleum Technology,2007,46(10):55-61.
[23]Ross D J K,Bustin R M.Impact of mass balance calculations on adsorption capacities in microporous shale gas reservoirs[J].Fuel,2007,86(17):2696-2706.
[24]桑树勋,朱炎铭,张井,等.煤吸附气体的固气作用机理(Ⅱ)[J].天然气工业,2005,25(1):16-18.
[25]李武广,杨胜来,徐晶,等.考虑地层温度和压力的页岩吸附气含量计算新模型[J].天然气地球科学,2012,23(4):791-796.
[26]曾芳.不同类型泥页岩吸附能力定量表征研究[D].大庆:东北石油大学,2014.
(1)Hartman C.Shale gas core analyses required for gas reserve estimates[R].Weatherfood Laboratories,TICORA Geosciences,2009.
[2]李新景,胡素云,程克明.北美裂缝性页岩气勘探开发的启示[J].石油勘探与开发,2007,34(4):392-400.
[3]聂海宽,张金川,张培先,等.福特沃斯盆地Barnett页岩气藏特征及启示[J].地质科技情报,2009,28(2):87-93.
[4]赵群.蜀南及邻区海相页岩气成藏主控因素及有利目标优选[D].中国地质大学(北京),2013.
[5]Rouquerol J,Avnir D,Fairbridge C W,et al.Recommendations for the characterization of porous solids[J].Pure and Applied Chemistry,1994,66(8):1739-1758.
[6]熊健,刘向君,梁利喜.四川盆地长宁构造地区龙马溪组页岩孔隙结构及其分形特征[J].地质科技情报,2015,34(4):70-77.
[7]张金川,金之钧,袁明生.页岩气成藏机理和分布[J].天然气工业,2004,24(7):15-18.
[8]Lewan M D,Willimas J A.Evaluation of petroleum generation from resinite by hydrous pyrolysis[J].AAPG Bulletin,1987,71(2):207-214.
[9]Law B E,Curtis J B.Introduction to unconventional petroleum systems[J].AAPG Bulletin,2002,86(11):1851-1852.
[10]Tissot B P,Welte D H.Petroleum Formation and Occurrence[M].2nd ed.New York:Springer-Verlag,1984.
[11]鄢杰,潘仁芳,唐小玲,等.页岩中油气的滞留机制及富集机理差异性比较[J].断块油气田,2015,22(6):711-716.
[12]Zhang T W,Ellis G S,Ruppel S C.Effect of organic matter type and thermal maturity on methane adsorption in shalegas systems[J].Org.Geochem.,2012,47(6):120-131.
[13]闫建萍,张同伟,李艳芳,等.页岩有机质特征对甲烷吸附的影响[J].煤炭学报,2013,38(5):805-811.
[14]刘德汉,史继扬.高演化碳酸岩的地球化学特征和生气规律[J].天然气地球科学,1994,5(2):40-41.
[15]熊伟,郭为,刘洪林,等.页岩的储层特征以及等温吸附特征[J].天然气工业,2012,32(1):1-4.
[16]范文斐,侯读杰,梁钰.中国南方页岩气牛蹄塘组与龙马溪组成藏条件对比研究——以渝东南地区为例[J].科学技术与工程,2015,15(27):13-22.
[17]杨宝刚,潘仁芳,赵丹,等.四川盆地长宁示范区龙马溪组页岩岩石力学特性及脆性评价[J].地质科技情报,2015,34(4):183-188.
[18]Ambrose R J,Hartman R C.New pore-scale considerations for shale gas in place calculations[C]//SPE Production and Operations Symposium.New York:Society of Petroleum Engineers,2011.
[19]张烈辉,唐洪明,陈果,等.川南下志留统龙马溪组页岩吸附特征及控制因素[J].天然气工业,2014,34(12):63-69.
[20]Zhao Hank.Thermal maturation and physical properties of Barnett Shale in Fort Worth Basin,North Texas[C]//AAPG Annual Meeting Program Abstracts,2004,13:154.
[21]Raut U,Fama M,Teolis B D,et al.Characterization of porosity in vapor deposited amorphous solid water from methane adsorption[J].The Journal of Chemical Physics,2007,127(20):1-6.
[22]Javadpour F,Fisher D,Unsworth M.Nanoscale gas flow in shale gas sediments[J].Journal of Canadian Petroleum Technology,2007,46(10):55-61.
[23]Ross D J K,Bustin R M.Impact of mass balance calculations on adsorption capacities in microporous shale gas reservoirs[J].Fuel,2007,86(17):2696-2706.
[24]桑树勋,朱炎铭,张井,等.煤吸附气体的固气作用机理(Ⅱ)[J].天然气工业,2005,25(1):16-18.
[25]李武广,杨胜来,徐晶,等.考虑地层温度和压力的页岩吸附气含量计算新模型[J].天然气地球科学,2012,23(4):791-796.
[26]曾芳.不同类型泥页岩吸附能力定量表征研究[D].大庆:东北石油大学,2014.
(1)Hartman C.Shale gas core analyses required for gas reserve estimates[R].Weatherfood Laboratories,TICORA Geosciences,2009.