中卫探区逆冲推覆构造特征及其石油地质意义  

Characteristics of overthrust in Zhongwei prospecting area and its significance in petroleum geology

作　　者：张建锋[1] 张金功[1] 吴汉宁[1] 徐春华[2] 董波[2] 

机构地区：[1]西北大学大陆动力学国家重点实验室／地质学系,陕西西安710069 [2]中国石化胜利油田分公司勘探项目管理部,山东东营257000

出　　处：《西北大学学报（自然科学版）》2008年第5期817-822,共6页Journal of Northwest University（Natural Science Edition）

基　　金：中国石化集团总公司重大基础研究基金资助项目(P06086);中国石化集团总公司胜利油田分公司勘探基金资助项目(2003-kt-02)

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.

关 键 词：中卫探区 逆冲推覆构造 气源岩 

分 类 号：TE121.2[石油与天然气工程—油气勘探]