昆仑山前柯东构造带构造解析及形成机制
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摘要
利用柯东地区最新采集的"宽线+大组合"地震剖面,结合地表露头和钻井资料,以柯东1号构造作为重点,对柯东构造带进行构造解析。新建的构造模型总体表现为由若干倾角不等的逆冲断层构成楔状叠瓦扇,其根部向南延伸收敛在基底卷入的高角度逆断层上,叠瓦扇前缘可能收敛在中生代和新生代地层接触界面上,发生滑脱形成薄皮逆冲构造。在逆冲叠瓦断层系统中,多个断块中发育有与断层相关的褶皱,形成了柯东构造带众多的圈闭。
The newest seismic profile of "wide line and large array" in Kedong area is used to interpret Kedong structural belt,taking the KD-1 trap as an example,combining with the study on outcrop and drilling data.The new structural model is an imbricate structure made up of thrust fault blocks with different dips.The root of the fault blocks is extending toward the south and convergent on the reverse fault with steep basement.The frontal of the imbricate structure may be convergent on the contact interface between the Mesozoic and the Cenozoic,which causes slipping and forms thin-skinned thrust fault structure,in which the multiple fault blocks combining with related folds have shaped several traps in Kedong structural belt.
The newest seismic profile of "wide line and large array" in Kedong area is used to interpret Kedong structural belt,taking the KD-1 trap as an example,combining with the study on outcrop and drilling data.The new structural model is an imbricate structure made up of thrust fault blocks with different dips.The root of the fault blocks is extending toward the south and convergent on the reverse fault with steep basement.The frontal of the imbricate structure may be convergent on the contact interface between the Mesozoic and the Cenozoic,which causes slipping and forms thin-skinned thrust fault structure,in which the multiple fault blocks combining with related folds have shaped several traps in Kedong structural belt.
引文
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[2]刘太勋,徐怀民,焦翠华.柯克亚气田古近系凝析气藏储层特征[J.]天然气工业,2007,27(4):18-20.
[3]陈新安,张兴林,屈秋平,等.塔西南山前构造特征及含油气前景[J.]新疆石油地质,1999,20(6):468-472.
[4]肖安成,杨树锋,陈汉林,等.西昆仑山前冲断系的结构特征[J.]地学前缘,2000,7(增刊):128-135.
[5]李向东,王克卓.西昆仑山北缘盆山构造转换解析[J.]新疆地质,2002,20(增刊):19-25.
[6]马华东,杨子江.塔里木盆地西南新生代盆地演化特征[J.]新疆地质,2003,21(1):92-95.
[7]伍秀芳,刘胜,汪新,等.帕米尔-西昆仑山麓新生代前陆褶皱冲断带构造剖面分析[J.]地质科学,2004,39(2):260-271.
[8]曲国胜,李亦纲,李岩峰,等.塔里木盆地西南前陆构造分段及其成因[J.]中国科学(D辑:地质科学),2005,35(3):193-202.
[9]向奎.塔里木盆地西南边缘压扭构造体系及其石油地质意义[J.]古地理学报,2006,8(2):233-240.
[10]何登发,吕修祥,董大忠,等.前陆盆地分析[M.]北京:石油工业出版社,1994:369-384.
[11]BurtmanVS,MolnarP.Geologicalandgeophysicalevidencefor deep subduction of continental crust beneath the Pamir[J.]Geological Society of America Special Paper,19932,86:1-76.
[12]李向东,王克卓.塔里木盆地西南及邻区特提斯格局和构造意义[J.]新疆地质,2000,18(2):113-120.
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