中卫探区逆冲推覆构造特征及其石油地质意义
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摘要
目的研究贺兰山中卫探区内逆冲推覆构造的特征及其石油地质意义。方法以ZW 1地震剖面为研究对象,通过野外地质踏勘、区域地质资料综合分析,研究中卫探区内地下是否存在逆冲推覆构造。结果中卫探区ZW 1地震剖面上发育大型的逆冲推覆构造,该逆冲推覆构造形成于晚侏罗世至早白垩世时期。在逆冲断裂的下盘,是一套正常沉积层序的地层,分别为侏罗系、三叠系、石炭—二叠系、寒武—奥陶系等地层。石炭—二叠系煤系地层的埋藏深度可达3800 m以上,有机质热演化已达到成熟阶段,可作为较好的气源岩。结论对中卫探区ZW 1测线构造特征的研究,证实了探区地下发育大型的逆冲推覆构造。中卫探区具有良好的天然气勘探前景。
Aim To study characteristics of overthrust in Zhongwei prospecting area Helan Mountain.Methods Taking ZW1 seismic as an object of study,discuss whether overthrust exist or not in subsurface in Zhongwei prospecting area on the basis of field exploration and regional data analyze.Results Large thrust nappe structure was developed along ZW1 seismic survey line,and it was formed during Late Jurassic to Early Cretaceous.There is a normal deposition sequence stratigraphy beneath the lower wall of over-thrust fault,such as Jurassic,Triassic,Permian-Carboniferous,Cambrian-Ordovician system.The burial depth of Permo-Carboniferous coal measure formations was over 3 800 m,the heat evolution of organic matter reached mature stage,and it can be taken as better gas source rocks.Conclusion The study on structural characteristics of ZW1 seismic has validated that there is large thrust nappe structure in Zhongwei prospecting area,suggesting that Zhongwei area possesses better gas exploration prospects.
Aim To study characteristics of overthrust in Zhongwei prospecting area Helan Mountain.Methods Taking ZW1 seismic as an object of study,discuss whether overthrust exist or not in subsurface in Zhongwei prospecting area on the basis of field exploration and regional data analyze.Results Large thrust nappe structure was developed along ZW1 seismic survey line,and it was formed during Late Jurassic to Early Cretaceous.There is a normal deposition sequence stratigraphy beneath the lower wall of over-thrust fault,such as Jurassic,Triassic,Permian-Carboniferous,Cambrian-Ordovician system.The burial depth of Permo-Carboniferous coal measure formations was over 3 800 m,the heat evolution of organic matter reached mature stage,and it can be taken as better gas source rocks.Conclusion The study on structural characteristics of ZW1 seismic has validated that there is large thrust nappe structure in Zhongwei prospecting area,suggesting that Zhongwei area possesses better gas exploration prospects.
引文
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[2]王同和,王喜双,韩宇春,等.华北克拉通构造与油气聚集[M].北京:石油工业出版社,1999:63-80.
[3]戴金星,钟宁宁,刘德汉,等.中国煤成大中型气田地质基础和主控因素[M].北京:石油工业出版社,2000:143-180.
[4]张文佑.断块构造导论[M].北京:石油工业出版社,1984:220-240.
[5]赵重远.华北克拉通沉积盆地形成与演化分析[M].西安:西北大学出版社,1990:56-240.
[6]林畅松,杨起,李思田.贺兰拗拉槽盆地充填演化分析[M].北京:地质出版社,1995:12-13.
[7]李天斌.贺兰山NNE向反“S”型构造的弹性力学探讨[J].地质力学学报,1997,3(3):21-28.
[8]张进,马宗晋,任文军.鄂尔多斯盆地西缘逆冲带南北差异的形成机制[J].大地构造与成矿学,2000,24(2):124-133.
[9]柳少波,宋岩,洪峰,等.中国中西部前陆盆地烃源岩特征与油气资源潜力分析[J].地学前缘,2005,12(3):59-65.
[10]汤锡元,郭忠铭,陈荷立,等.陕甘宁盆地西缘逆冲推覆构造带油气勘探[M].西安:西北大学出版社,1998:8-13.
[11]赵重远.鄂尔多斯地块西缘构造演化及板块应力机制初探[M]∥赵重远,刘池阳.华北克拉通沉积盆地形成与演化及其油气赋存.西安:西北大学出版社,1990:107-114.
[12]杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社,2002:24-28.
[13]何自新.鄂尔多斯盆地演化与油气[M].北京:石油工业出版社,2003:66-109.
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