【7A文】石油构造分析-第2讲 伸展盆地及生长构造 第2部分.ppt

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1、不同构造背景下裂陷盆地的结构差异裂陷盆地不同发育阶段的结构变化裂陷盆地控边断裂和控凹断裂的展布和发展转换带对裂陷盆地结构、沉积和地层的制约裂陷盆地富烃凹陷中圈闭构造样式转换带（transferzone）和调节带（accommodationzone）是裂陷盆地的典型结构特征之一，具有分割、过渡一级构造单元及其内部结构的功能。转换带的概念是Dahlstrtom,C.D.A(1970)首次提出，C.K.Morley(1990)提出伸展地区转换带的分类。在伸展型盆地中，转换带是指为保持区域伸展应变守恒

2、而产生的伸展变形构造转接体系。Differenttypesoffault-to-faulttransferzones(stippledareas)inthemappedpartsoftheSuezrift,Cairo-Suezarea,andthenorthwesternRedSea.(A)Relayramp;(B)linkingtransferfault(TF);(C)enechelonstepfaulting;(D)enechelonhorst-grabenfaulting;(E)tiltedfau

3、ltblocks;(F)zigzagfaultarray.Faultsdrawninheavylinesarethoselinkedbythetransferzone.（AdelR.Moustafa,2002）Kinematicrelationshipbetweentheright-lateraloblique-slipmovementontheeast-west–orienteddeep-seatedfaultsunderlyingtheenechelonfaultbeltsoftheCairo-Su

4、ezdistrictandthedip-slipnormalmovementonthelinked,northwest-southeast–orientedfaults.Blockdiagramsrepresentthedeep-seatedstructures,whereasthemapsshowthestructuresatthetopEocenesurface.(A)Linkedfaultshavethesamepolarity.Triangledrawnonthefrontfaceshowsth

5、eresolutionoftheslipvector(hypotenuse)ofthehangingblockofthetransferfaultintostrike-slipanddip-slipcomponents.(B)Linkedfaultshaveoppositepolarity.SimplifiedstructuralmapoftheSuezriftandnorthwesternRedSearegionshowingthreeH-HTZBetweenoppositelytiltedhalfg

6、rabens.Map-viewevolutionoftheLokicharfault,northernKenya.Thefaultzoneappearstohaveevolvedbyamalgamationoftwoinitiallyseparatefaultsinthesouthernpartofthefaultzone,theassociatedbasinsjoined,andhalfgrabensdevelopedduringthePaleogeneandearlyMiocene.Thenorth

7、ernpartofthefaultzonedevelopedduringthelateMiocene–PlioceneandjoinedwiththelargelyinactiveLokicharbasinsegmentofthefault.ThestructuremapisbasedonseismicreflectiondatapresentedinMorleyetal.(1999a).Conceptualmodelofanarrowriftsystemshowinganalong-strikecha

8、ngeinthehalf-grabenpolarity.Thepossiblevariationsinsynriftsedimentationpatternsandsedimentinputpointsareshown.SuezriftAmgadI.Younes，2002地堑半地堑地堑半地堑地堑地堑半地堑半地堑半地堑半地堑惠州凹陷文昌组等厚图文昌组：转换带分割的张扭性斜列式裂陷结构半地堑半地堑半地堑地堑C.惠州转换带分类惠州转换带分类表复合