简介：ThereareplentyofSinianandCambrianpotentialshalegasresourcesinSouthChina,whichischaracterizedbyhighthermalevolutiondegrees,poordrillingperformancesandonlyoccursinlocalareas.Takingtheprinciple“hightofindlow”isthekeyissuetoachievingabreakthroughinoldershale.ChinaGeologicalSurveydrilledintheperipheryoftheProterozoicbasement,i.e.theHuanglinganticline,inthewesternHubei,andHannanpaleocontinentinthesouthernShanxi.Itreceivedhigh-qualitygas-bearingshalewithrelativelylowRointheinLowerCambrianNiutitangformationandSinianDoushantuoformation.BasedongeologicalconditionsofshalegasreservoirsintheHuanglinganticline,thispaperputsforwardthenewmodelnamed“Controloverreservoirsbyperipheryofbasement”aboutshalegasaccumulation,suggestingthattheshaledepositedinadeepwatercontinentalshelfintheperipheryofthebasementischaracterizedbyshallowburial,ashortburialtime,stabletectonics,relativelylowthermalevolutiondegrees,andshalegasreservoirsinagoodcondition.TheshaleoftheSinian-CambrianstratadepositedindeepwatercontinentalshelvesintheperipheryofChuanzhongpaleo-upliftinSichuan,HannanpaleocontinentinthesouthernShanxi,HuanglinganticlineinwesternHubeiandJiangnang-Xuefengpaleo-upliftinHunanandGuizhouprovincehavegoodshalegasexplorationpotential.

简介：InordertomakeabreakthroughinMesozoic-PaleozoicshalegasexplorationintheSouthYellowSeaBasin,acomparisonofthepreservationconditionswasmadewithintheBarnettshalegasreservoirsintheFortworthBasin,theJiaoshibashalegasreservoirsinSichuanBasinandpotentialshalegasreservoirsinGuizhouProvince.Theresultsshowthatthe"Sandwich"structureisofgreatimportanceforshalegasaccumulation.Thereinto,the"Sandwich"structureisakindofspecialreservoir-caprockassemblagewhichconsistoflimestoneordolomiteonthetop,mudstoneorshalelayerinthemiddleandlimestoneordolomiteatthebottom.InconsiderationoftheMesozoic-PaleozoieintheLowerYangtze,andLaoshanUpliftwithweakPaleozoicdeformationandthrustfaultsealingOnbothflanksoftheLaoshanUplift,aconclusioncanbedrawnthatthepreservationconditionsofshalegasprobablydeveloped"Sandwich"structuresintheLowerCambrianandPermian,whicharekeylayersforthebreakthroughofshalegasintheSouthYellowSea.Moreover,thepreferredtargetsforshalegasdrillingprobablylocateatbothflanksoftheLaoshanUplift.