准噶尔盆地西北缘乌夏走滑构造及油气勘探意义
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摘要
野外地质调查资料和二维-三维地震反射剖面显示,西准噶尔晚古生代-中生代发育达尔布特走滑断层和克拉玛依—夏子街断裂带,达尔布特走滑断层为正花状构造,克拉玛依—夏子街断裂带发育右行走滑构造,形成雁行排列的乌尔禾背斜、夏子街背斜和高角度倾斜剪切断层等。古生代晚期-中生代准噶尔盆地西北缘发生右行剪切为主兼有逆冲的走滑运动,形成走滑断层和剪切断层转折褶皱,并非过去较普遍认为的准噶尔盆地西北缘发育逆冲推覆构造。新生代印度板块—欧亚大陆碰撞引发达尔布特断层重新活动发生左行走滑,克拉玛依—夏子街断裂带新生代未活动。搞清走滑构造的特征及其相关的圈闭类型,对该区油气勘探很有帮助。
New structural studies and 2-D and 3-D seismic profiles reveal that in the Upper Paleozoic-Mesozoic in western Junggar basin develop Dalabute strike-slip fault and Karamay-Xiazijie fault belt.The former assumes normal flower-shaped structures,the latter develops right strike-slip structures which form en echelon arrangement of Wuerhe antiline,Xiazijie anticline,high angle-dipping shear faults.In Late Paleozoic-Mesozoic the northwestern margin of Junggar basin occurred strike-slip movement dominated by right shear and overthrust structures,shaping the strike-slip faults and shear fault dogleg folds.This could deny the previous long-time idea of that in the northwestern margin of Junggar basin developed overthrust nappe structure.It is the collision between Cenozoic India plate and Eurasia that caused the reactivation of Dalabute fault along left strike-slip,while Karamay-Xiazijie fault belt was not activated in Cenozoic.
New structural studies and 2-D and 3-D seismic profiles reveal that in the Upper Paleozoic-Mesozoic in western Junggar basin develop Dalabute strike-slip fault and Karamay-Xiazijie fault belt.The former assumes normal flower-shaped structures,the latter develops right strike-slip structures which form en echelon arrangement of Wuerhe antiline,Xiazijie anticline,high angle-dipping shear faults.In Late Paleozoic-Mesozoic the northwestern margin of Junggar basin occurred strike-slip movement dominated by right shear and overthrust structures,shaping the strike-slip faults and shear fault dogleg folds.This could deny the previous long-time idea of that in the northwestern margin of Junggar basin developed overthrust nappe structure.It is the collision between Cenozoic India plate and Eurasia that caused the reactivation of Dalabute fault along left strike-slip,while Karamay-Xiazijie fault belt was not activated in Cenozoic.
引文
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[2]况军,齐雪峰.准噶尔前陆盆地构造特征与油气勘探方向[J].新疆石油地质,2006,27(1):5-9.
[3]刘振宇,徐怀宝,庞雷.准噶尔盆地乌夏断裂带构造迁移特征[J].新疆石油地质,2007,28(4):399-402.
[4]何登发,管树巍,张年富,等.准噶尔盆地哈拉阿拉特山冲断带构造及找油意义[J].新疆石油地质,2006,27(3):267-269.
[5]管树巍,李本亮,侯连华,等.准噶尔盆地西北缘下盘掩伏构造油气勘探新领域[J].石油勘探与开发,2008,35(1):17-22.
[6]吴孔友.准噶尔盆地乌夏地区油气输导体系与成藏模式[J].西南石油大学学报(自然科学版),2009,31(5):25-30.
[7]Feng Y,Coleman R G,Tilton G,et al.Tectonic evolution ofthe west Junggar region,Xinjiang,China[J].Tectonics,1989,8(4):729-752.
[8]Molnar P,Tapponnier P.Cenozoic tectonics of Asia-effects ofa continental collision[J].Science,1975,189(4201):419-426.
[9]Avouac J P,Tapponnier P,Bai M,et al.Active thrusting andfolding along the northern Tien-Shan and late cenozoic ro-tation of the Tarim relative to Dzungaria and Kazakstan[J].Journal of Geophysical Research,1993,98(B4):6 755-6 804.
[10]孟家峰,郭召杰,方世虎.准噶尔盆地西北缘冲断构造新解[J].地学前缘,2009,16(3):171-180.
[11]Shaw J H,Connors C D,Suppe J,et al.Seismic interpreta-tion of contractional fault-related folds:an AAPG seismicatlas[M].Tulsa,Okla:American Association of PetroleumGeologists,2005.
[12]Suppe J,Chou G T,Hook S C.Rates of folding and faultingdetermined from growth strata Thrust tectonics[M].Chap-man&Hall,1992:105-121.
[13]Allmendinger R W.Inverse and forward numerical model-ing of trishear fault-propagation folds[J].Tectonics,1998,17(4):640-656.
[14]孟家峰.准噶尔盆地西北缘构造特征及石油地质意义[D].北京:北京大学,2009.
[15]赵白.准噶尔盆地的形成与演化[J].新疆石油地质,1992,13(3):191-196.
[16]韩宝福,季建清,宋彪,等.新疆准噶尔晚古生代陆壳垂向生长(Ⅰ)——后碰撞深成岩浆活动的时限[J].岩石学报,2006,22(5):1 077-1 086.
[17]李辛子,韩宝福,季建清,等.新疆克拉玛依中基性岩墙群的地质地球化学和K-Ar年代学[J].地球化学,2004,33(6):574-584.
[18]Tapponnier P,Molnar P.Aative faulting and Cenozoictectonics of the Tien-Shan,Mongolia,and Baykal regions[J].Journal of Geophysical Research,1979,84(NB7):3 425-3 459.
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