塔里木盆地巴楚隆起卡拉沙依断裂带活动特征
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摘要
通过系统的地震资料综合解释,对塔里木盆地巴楚隆起卡拉沙依断裂上、下盘沉积地层厚度的变化及各界面与上、下部地层的接触关系、不整合面的发育特征及变化规律进行研究,以此来探讨卡拉沙依断裂各时期的活动特征。认为卡拉沙依断裂东、西两段呈现出截然不同的活动特征。主断裂东段,晚寒武世—奥陶纪,断裂无明显活动;早志留世晚期—早二叠世,断裂开始活动,呈现出逆冲推覆断裂的特征;经中二叠世的平静期,从晚二叠世开始又有一次逆冲推覆活动。而位于主断裂南侧的次级断裂,在晚寒武纪—中志留世,断裂无明显活动;从早中泥盆世开始,次级断裂开始活动,表现为压性断裂特征,逆冲推覆作用持续至早二叠世,经过中二叠世短暂的平静期,在晚二叠世还有一次继承性活动,但活动强度较弱。主断裂西段,奥陶纪时期,断裂开始活动并表现出张性断裂活动特征;经过志留纪—中二叠世的平静期,从晚二叠世开始,断裂西段发生正反转作用,逆冲推覆活动明显。次级断裂西段,在晚寒武世—早中二叠世并无活动,从晚二叠世开始,断裂开始活动,表现为强烈的逆冲推覆作用。
Based on the interpretation of seismic data,the residual thickness of sediment strata,contact relationship between overlying and underlying strata,interfaces in the hanging wall and footwall blocks,and development characteristics and variational rules of unconformity in Kalashayi fault in Bachu uplift of Tarim Basin were researched,moreover the characteristics of activities of Kalashayi fault in different stages were investigated.The results show that the east section and the west section of Kalashayi fault have different activities.In the east section,the fault is inactive from Late Cambrian to Ordovician,and thrusting nappe fault occurs from the late stage of Early Silurian to Early Permian;in Middle Permian the fault is inactive and thrusts again in Late Permian.The subsidiary faults located in the south of main fault are inactive from Late Cambrian to EarlyMiddle Silurian,then strongly thrust since Early Devonian and continue to thrust until Early Permian;after a quiet period within Middle Permian,the faults are weakly active in Late Permian.In the west section,the fault is inactive since Late Cambrian;in Ordovician,the fault is active to be an extensional fault;from Silurian to Middle Permian,there occurs a quiet stage;in Late Permian,the fault has undergone a positive inversion movement.The subsidiary faults in the west section are inactive from Late Cambrian to Middle Permian and are strongly active to be thrusting nappe faults since Late Permian.
Based on the interpretation of seismic data,the residual thickness of sediment strata,contact relationship between overlying and underlying strata,interfaces in the hanging wall and footwall blocks,and development characteristics and variational rules of unconformity in Kalashayi fault in Bachu uplift of Tarim Basin were researched,moreover the characteristics of activities of Kalashayi fault in different stages were investigated.The results show that the east section and the west section of Kalashayi fault have different activities.In the east section,the fault is inactive from Late Cambrian to Ordovician,and thrusting nappe fault occurs from the late stage of Early Silurian to Early Permian;in Middle Permian the fault is inactive and thrusts again in Late Permian.The subsidiary faults located in the south of main fault are inactive from Late Cambrian to EarlyMiddle Silurian,then strongly thrust since Early Devonian and continue to thrust until Early Permian;after a quiet period within Middle Permian,the faults are weakly active in Late Permian.In the west section,the fault is inactive since Late Cambrian;in Ordovician,the fault is active to be an extensional fault;from Silurian to Middle Permian,there occurs a quiet stage;in Late Permian,the fault has undergone a positive inversion movement.The subsidiary faults in the west section are inactive from Late Cambrian to Middle Permian and are strongly active to be thrusting nappe faults since Late Permian.
引文
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[8]张洪安,吴根耀,李曰俊,等.塔里木盆地西部巴楚断隆南界断裂带的主要特征和构造演化[J].地质通报,2011,30(10):1547-1556.
[9]何文渊,李江海,钱祥麟,等.塔里木盆地巴楚断隆中新生代的构造演化[J].北京大学学报:自然科学版,2000,36(4):539-546.
[10]吕海涛,张仲培,邵志兵,等.塔里木盆地巴楚—麦盖提地区早古生代隆起的演化及其勘探意义[J].石油与天然气地质,2010,31(1):76-84.
[11]郑显化.塔里木盆地西部巴楚—麦盖提地区石油地质特征及勘探建议[J].石油实验地质,1995,17(2):114-120.
[12]丁文龙,林畅松,漆立新,等.塔里木盆地巴楚隆起构造格架及形成演化[J].地学前缘,2008,15(2):242-252.
[2]庄培人,常志忠.断裂构造研究[M].北京:地震出版社,1996:119-235.
[3]杨海军,李曰俊,冯晓军.塔里木盆地玛扎塔格构造带断裂构造分析[J].地质科学,2007,42(3):506-517.
[4]Donatella Massoli,Hemin A Koyi,Massimiliano R Barchi.Struc-tural evolution of a fold and thrust belt generated by multiple de-collements:analogue models and natural examples from the North-ern Apennines(Italy)[J].Journal of Structural Geology,2006,28:185-199.
[5]Sebastian A Turner,Jian G Liu,John W Cosgrove.Structural e-volution of the Piqiang Fault Zone,NW Tarim Basin,China[J].Journal of Asian Earth Sciences,2011,40:394-402.
[6]Walker R T.A remote sensing study of active folding and faultingin southern Kerman province,SE Iran[J].Journal of StructuralGeology,2006,28:654-668.
[7]肖安成,杨树锋,李曰俊,等.塔里木盆地巴楚—柯坪地区新生代断裂系统[J].石油与天然气地质,2005,26(1):78-85.
[8]张洪安,吴根耀,李曰俊,等.塔里木盆地西部巴楚断隆南界断裂带的主要特征和构造演化[J].地质通报,2011,30(10):1547-1556.
[9]何文渊,李江海,钱祥麟,等.塔里木盆地巴楚断隆中新生代的构造演化[J].北京大学学报:自然科学版,2000,36(4):539-546.
[10]吕海涛,张仲培,邵志兵,等.塔里木盆地巴楚—麦盖提地区早古生代隆起的演化及其勘探意义[J].石油与天然气地质,2010,31(1):76-84.
[11]郑显化.塔里木盆地西部巴楚—麦盖提地区石油地质特征及勘探建议[J].石油实验地质,1995,17(2):114-120.
[12]丁文龙,林畅松,漆立新,等.塔里木盆地巴楚隆起构造格架及形成演化[J].地学前缘,2008,15(2):242-252.
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