东秋里塔格构造带盐相关构造圈闭及成藏模式
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摘要
东秋里塔格构造带发育的新近系吉迪克组膏盐层,在库车组沉积时期以来的构造变形过程中起到了滑脱和调节地层变形的作用,地震剖面解释结果表明,盐上构造圈闭主要有盐上背斜、盐上逆冲断层遮挡圈闭等;盐层内部圈闭是由其中碳酸盐岩和砂岩夹层所形成的岩性和褶皱圈闭;盐下构造圈闭主要有盐下背冲断块圈闭等。结合研究区的成藏条件认为研究区具有以断裂和不整合为输导层的它源-侧向排烃油气成藏模式,主要构造活动期与阳霞凹陷的烃源岩演化有着很好的匹配关系,使研究区构造圈闭内聚集了大量来自阳霞凹陷的天然气。
The thick Neogene salt layer developed in the Eastern part of Qiulitage Belt, through the representative seismic profiles, it is reveled that the salt layer is a decollement layer and adjustes the differentiated deformation between the supra-salt layer and the sub-salt layers, the structural traps in the supra-salt layer are mainly anticline trap, thrust fault sheltering trap, etc, the traps in the salt layer are mainly the lithostratigraphic trap or the anticline trap constituted of the carbonate rock and the sandstone, the structural traps in the sub-salt layer are mainly the pop-up etc. Combining this result with analyzing of the condition of the hydrocarbon accumulation, the authors consider there is the accumulation pattern of separated source-side rejecting in the area with a transporting layer composed of faults and unconformities, there is a good relationship between the evolution history of the source rock in Yangxia Sag and the structural deformation, all these make the structural traps in the studied area capture the natural gas generated in Yangxia Sag.
The thick Neogene salt layer developed in the Eastern part of Qiulitage Belt, through the representative seismic profiles, it is reveled that the salt layer is a decollement layer and adjustes the differentiated deformation between the supra-salt layer and the sub-salt layers, the structural traps in the supra-salt layer are mainly anticline trap, thrust fault sheltering trap, etc, the traps in the salt layer are mainly the lithostratigraphic trap or the anticline trap constituted of the carbonate rock and the sandstone, the structural traps in the sub-salt layer are mainly the pop-up etc. Combining this result with analyzing of the condition of the hydrocarbon accumulation, the authors consider there is the accumulation pattern of separated source-side rejecting in the area with a transporting layer composed of faults and unconformities, there is a good relationship between the evolution history of the source rock in Yangxia Sag and the structural deformation, all these make the structural traps in the studied area capture the natural gas generated in Yangxia Sag.
引文
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[2]柳广弟,王雅星.库车坳陷纵向压力结构与异常高压形成机理[J].天然气工业,2006,26(9):29-31.
[3]刘玉魁,闵磊,冯游文,等.塔里木盆地乌什凹陷石油地质特征[J].天然气工业,2007,27(1):24-26.
[4]朱蓉,楼章华,金爱民.库车坳陷中新生代天然气成藏动力学研究[J].天然气工业,2006,26(5):5-7.
[5]王红军,胡见义.库车坳陷白垩系含油气系统与高压气藏的形成[J].天然气工业,2002,22(1):5-8.
[6]Jackson MP A,Roberts D G,Snelson S.Retrospective salt tectonics[G]//Salt Tectonics:A Global Perspective.AAPG Memoir65,1995:1-28.
[7]Poliakov A N B,Podladchikov Y Y,Dawson E C,et al.Salt diapirism with simultaneous brittle faulting and vis-cous flow[G]//Salt Tectonics.London:Geological Society of London Special Publication100,1996:275-302.
[8]李振生,刘德良,杨强.库车褶皱冲断带断裂、构造对油气藏的控制作用[J].天然气工业,2007,27(5):36.
[9]汤良杰,李京昌,余一欣,等.库车前陆褶皱-冲断带盐构造差异变形和分段性特征探讨[J].地质学报,2006,80(3):313-320.
[10]汤良杰.塔里木盆地演化和构造样式[M].北京:地质出版社,1996.
[11]王清华,杨明慧,吕修祥.库车褶皱冲断带秋里塔格构造带东、西分段构造特征与油气聚集[J].地质科学,2004,39(4):523-531.
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