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时间:2020-01-13
《下扬子区伸展拆离构造.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第38卷第1期石油雾劈沾届VolJ38.No.12016年1月PETRoLEUMGEoLoGY&EXPER玎讧ENTJan.,2016文章编号:1001-6112(2016)O1—0001—08doi:10.11781/sysydz201601001下扬子区伸展拆离构造丁道桂,罗开平,刘光祥,吕俊祥(中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214151)摘要:在郯庐断裂带以东,包括苏北一南黄海地区在内的下扬子区,晚白垩世一古近纪时期,在太平洋板块由南向北俯冲消减的运动过程中,东亚大陆被牵引,发生了由南向北的大型左行平移走滑运动和岩石圈上地壳递进减薄拉张的伸展拆离构造运动
2、。从苏、皖南的南陵一广德、句容一常州断陷盆地开始,经苏北东台、盐阜坳陷一南黄海南部的青岛坳陷.再向北至南黄海北部的烟台坳陷,形成了3条呈NE一近EW走向的断陷盆地构造带。盆地为具有南断北超的箕状半地堑结构,呈多米诺骨牌式自南向北排列;并与其间近E-W走向的南京一南通一勿南沙和滨海—南黄海中部的崂山古生界地层的核部杂岩褶隆带.共同构成较大区域范围的盆一岭构造。这一期构造运动一方面再次改造了下扬子区海相古生代盆地.为海相古生界烃源岩系在经历了抬升剥蚀后的再次深埋,以及晚期二次生烃提供了可能性;另一方面也控制了中新生代油气的生成与聚集分布。关键词:盆一岭构造;多米诺式半地堑;陡崖断层;核部
3、杂岩褶隆带;伸展拆离;下扬子区中图分类号:TEl21.2文献标识码:AExtensionaldetachmentstructuresintheLowerYangtzeregionDingDaogui,LuoKaiping,LiuGuangxiang,LiiJunxiang(WuxiResearchInstituteofPetroleumGeology,SINOPEC,Wuxi,Jiangsu214126,China)Abstract:FromtheLateCretaceoustoPaleogene,thePacificPlatesubductedfromsouthtonorth.As
4、aresult,theEastAsiaContinentwassheared.Large-scaleleft—lateralstrike—slipmovementsfromsouthtonorthandexten—sionaldetachmentmovementswhichcausedthethinningofthecrusttookplaceintheLowerYangtzeregion(theareatotheeastofTanluFault.includingthenorthernJiangsuandSouthYellowSearegions).ThreeNE—EWorient
5、edriftbasinzonesdeveloped,including:(1)theNanli.ng—GuangdeandJurong—ChangzhouriftbasinsinJiangsuandthesouthernAnhui;(2)theDongtaiandFurringdepressionsinthenorthernJiangsuandtheQingdaoDepressioninthesouthernSouthYellowSeaBasin;(3)theYantaiDepressioninthenorthernSouthYellowSeaBasin.Thesebasinzone
6、shadhalf-grabenstructureswhichwerefaultedinthesouthandonlappinginthenorth.Theyarrangedlikedominosfromsouthtonorth.andformedbasinandrangestructurestogetherwiththeEWorientedNanjing—Nantong—WunanshaandBinhai-SouthYellowSeauplifts.Thesetectonicactivitiesref~'rmedthemarinePaleogenebasinsintheLowerYa
7、ngtzeregion.MarinesourcerocksinthePaleogenemightbedeeplyburiedafterupliftinganderosion,whichmadesecondaryhydrocarbongenerationpossibleandcontrolledhydro—carbongenerationanddistributionintheMiocene.Keywords:basinandrangestructure;h
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