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1、石油勘探与开发2013年8月PETROLEUMEXPLORATIONANDDEVELOPMENTVol.40No.4423文章编号:1000-0747(2013)04-0423-06DOI:10.11698/PED.2013.04.05四川盆地湖相页岩气地质特征与资源潜力1,22212李延钧,冯媛媛,刘欢,张烈辉,赵圣贤(1.“油气藏地质及开发工程”国家重点实验室;2.西南石油大学资源与环境学院)基金项目:国家自然科学杰出青年基金(51125019)摘要:分析页岩有机质丰度、类型、成熟度等地球化学特征,及页岩沉积环境、地质特征和发育规
2、模,研究四川盆地下侏罗统自流井组湖相页岩气地质特征及资源潜力。四川盆地自流井组湖相页岩主要发育于东岳庙段和大安寨段,页岩样品有机碳含量、干酪根显微组分、生物标志化合物和镜质体反射率等地球化学分析表明,页岩TOC值一般大于1.0%;有机质类型为Ⅱ1—Ⅲ型,湖盆中心主要为Ⅱ1型;Ro值为1.05%~1.82%,具有较强的生气能力。自流井组−3−32页岩厚度约为40~150m,分布面积广,页岩平均孔隙度为1%~5%,渗透率主要为0.001×10~0.100×10μm。湖相页岩发育3种地层组合模式:纯页岩、页岩夹灰质条带、页岩夹薄—中层介壳灰
3、岩,页岩中石英含量较高,利于页岩气开采;页岩中发育的灰质条带、介壳灰岩可进一步提高页岩储集层的经济可采性。容积法估算四川盆地自12123流井组湖相页岩气资源量约为3.8×10~8.7×10m。图8表1参22关键词:页岩气;湖相;地质特征;资源潜力;自流井组;四川盆地中图分类号:TE122.2文献标识码:AGeologicalcharacteristicsandresourcepotentialoflacustrineshalegasintheSichuanBasin,SWChina1,22212LiYanjun,FengYuanyua
4、n,LiuHuan,ZhangLiehui,ZhaoShengxian(1.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,SouthwestPetroleumUniversity,Chengdu610500,China;2.SchoolofResourcesandEnvironment,SouthwestPetroleumUniversity,Chengdu610500,China)Abstract:Thegeochemicalcharacteristicso
5、fshalesuchastotalorganiccontent,typeandmaturity,shalesedimentaryenvironment,geologicalcharacteristics,andscaleofdevelopmentwereanalyzedtostudythegeologicalcharacteristicsandresourcepotentialoflacustrineshaleintheLowerJurassicZiliujingFormationintheSichuanBasin.TheLowerJ
6、urassicZiliujingFormationlacustrineshaleismainlydevelopedintheDongyuemiaoandDa’anzhaimembers.Thegeochemicalanalysisoftheorganiccarboncontent,kerogenmacerals,biomarkercompoundsandvitrinitereflectanceoftheshalesamplesshowedthatthetotalorganiccontentisgenerallyover1.0%;the
7、mainorganictypeisII1-III,buttypeII1isinthecentralpartofthebasin;thevitrinitereflectancevalue(Ro)is1.05%-1.82%,thustheshalehasastrongabilitytogenerategas.ThethicknessofthedistributedZiliujingshaleisapproximately40-150m,theaverage−3−32porosityis1%-5%,andthepermeabilityis0
8、.001×10-0.100×10μm.Thelacustrineshaleconsistsofdifferentassemblages:pureshale,shalewithimbeddedlimeband,andsha