喀什凹陷地层不整合的构造意义及对油气成藏的影响
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摘要
塔里木盆地喀什凹陷南缘与北缘褶皱冲断带现今对接在一起 ,存在多个地层不整合 ,表明冲断活动具有爆发式的特点。根据这两个前陆褶皱冲断带中地层不整合的层位不一一对应和分布范围、展布特点有不同 ,认为南缘冲断活动稍早于北缘 ,二者的冲断规模也不完全相当。由于褶皱冲断带中油气圈闭形成期普遍晚于烃源岩大规模排烃期 ,喀什凹陷南缘与北缘褶皱冲断带现存的油气藏主要应该是次生的。图 1参 2 4
The unconformities in the north and south fold-thrust belts of the Kashi Sag are diachronous and are of different intensity. Development of the south fold-thrust belt took place slightly earlier than that of the north fold-thrust belt. Presence of multiple unconformities further indicates pulses of thrust faulting. The hydrocarbon accumulation in the fold-thrust belts is secondary in nature because that the traps were formed after the major release of hydrocarbon from the source rocks.
The unconformities in the north and south fold-thrust belts of the Kashi Sag are diachronous and are of different intensity. Development of the south fold-thrust belt took place slightly earlier than that of the north fold-thrust belt. Presence of multiple unconformities further indicates pulses of thrust faulting. The hydrocarbon accumulation in the fold-thrust belts is secondary in nature because that the traps were formed after the major release of hydrocarbon from the source rocks.
引文
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[6] 曲国胜,陈杰,陈新安,等.西昆仑帕米尔造山带及其北缘前陆盆地板内变形构造[J].地质论评,1998,44(4):419429.
[7] 曲国胜,陈杰,陈新发,等.塔里木盆地阿图什八盘水磨反冲构造系统研究[J].地震地质,2001,23(1):114.
[8] 汪新,贾承造,杨树锋.南天山库车褶皱冲断带构造几何学和运动学[J].地质科学,2002,37(3):372384.
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[10] 沈军,赵瑞斌,等.塔里木盆地西北缘河流阶地变形测量与地壳缩短速率[J].科学通报,2001,46(4):334338.
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[12] 李建华,张家声,单新建.西昆仑西南天山地区断裂活动性研究[J].地质学报,2002,76(3):347353.
[13] ChenJie,BurbankDW ,ScharercKM ,etal.Magnetochron ologyoftheUpperCenozoicstrataintheSouthwesternChineseTianShan:ratesofPleistocenefoldingandthrusting[J].EarthandPlanetaryScienceLetters,2002,195(12):113130.
[14] 程日辉,林畅松,刘景彦.盆地研究中不整合成因分析[J].世界地质,1998,17(3):2327.
[15] 孙宝生,等.塔里木盆地西南坳陷喀什凹陷南部石油地质综合研究报告[R].库尔勒:塔里木油田研究院,2001.
[16] BurtmanVS .FaultsofMiddleAsia[J].Amer.J.Sci.,1980,28:725744.
[17] 杨克明.论西昆仑大陆边缘构造演化及塔里木西南盆地类型[J].地质论评,1994,40(1):917.
[18] BurtmanVS,SkobeleSF ,MolnarP .LateCenozoicslipontheTalasFerghanaFault,theTianShan,CentralAsia[J].GeologicalSocietyofAmericaBulletin,1996,108(8):10041021.
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[21] 张春生,肖安成,李景义,等.塔西南坳陷侏罗系断陷盆地沉积特征[J].矿物岩石,2000,20(3):4145.
[22] 史基安,陈国俊,等.塔里木盆地西部层序地层与沉积、成岩演化[M].北京:科学出版社,2001.
[23] 李昌存,韩秀丽.喀什凹陷第三纪灰岩流体包裹体及其应用研究[J].矿物学报,1998,18(1):4651.
[24] 王东良,等.喀什凹陷北缘成藏地球化学研究[R].任丘:中国石油华北油田勘探开发研究院生油室.
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