摘要
通过采用先进的地质解释软件,对柴北缘冷湖地区的三维地震资料进行解释,建立起该区域新生代的三维构造模型。研究区新生代构造主要是由断层F2活动引起的断层相关背斜,发育3条主要断层F2、F5和F6,均具有右行走滑冲断的性质。结合区域地质资料及断层F2的几何学和运动学特征,认为该断层和它的相关背斜为油气的二次运移和聚集提供了较好的通道和构造圈闭。
Through the interpretation of three-dimensional seismic profiles and by the use of the advanced geologic software, the Cenozoic underground three-dimensional structural model of Lenghu area on the northern margin of the Qaidam Basin is established. By observing and analyzing the three-dimensional structural model it can be discovered that the Cenozoic structure in the Lenghu area is a fault-related anticline resulted from fault F2. Three major faults, i.e., F2, F5 and F6, occur in the Cenozoic in the Lenghu area, and the faults in T2′ surface dextrally cut across the contour, which reflects that the faults are of the dextral strike-slip thrust type and were resulted from a wrenching stress field. The dextral strike-slip thrust faults in the Lenghu area are closely related to the Altun Tagh structural belt, which is a sinistral strike-slip thrust belt developed in the Cenozoic. Via analysis of the regional geologic data and the geometry and kinematics of fault F2, it can be concluded that the fault F2 and its related fold provide excellent channels and structural traps for hydrocarbon migration and accumulation.
引文
包世泰,夏斌,崔学军,黎华.2004.地质三维信息模型研究及其应用.大地构造与成矿学,28(4):470-476.
戴俊生,曹代勇.2000.柴达木盆地新生代构造样式的演化特点.地质论评,46(5):455-460.
狄恒恕,王松贵.1991.柴达木盆地北缘中、新生代构造演化探讨.中国地质大学学报,16(5):533-539.
高先志,陈发景,马达德,汪立群,刘震.2003.中、新生代柴达木盆地北缘的盆地类型与构造演化.西北地质,36(4):16-24.
葛肖虹,任收麦,刘永江,刘俊来,潘宏勋.2001.中国西部的大陆构造格架.石油学报,22(5):1-5.
郭占谦,师继红.2001.新构造运动活跃的柴达木盆地含油气系统特征.大庆石油地质与开发,20(1):9-12.
胡受权,曹运江,黄继祥,牟中海.1999.柴达木盆地北缘地区前陆盆地演化及油气勘探目标.天然气工业,19(4):1-5.
胡勇,刘平,曹海防.2004.柴北缘侏罗系烃源岩地球化学特征及其综合评价.大地构造与成矿学,28(4):464-469.
姜正龙,孙德君,秦建中,胡国艺,方向.2001.柴达木盆地北缘下侏罗统含油气系统研究.石油勘探与开发,28(6):9-12.
康竹林.1999.柴达木盆地北缘块断带油气勘探前景.勘探家,4(3):27-30.
李廷栋.1995.青藏高原隆升的过程和机制.地球学报,1:1-9.
李相博,王新民,袁剑英,靳久强,于均民,马龙.2001.青藏高原东北部旋扭动构造变形及其形成地质条件分析.大地构造与成矿学,25(2):120-127.
鲁如魁,钟华明,童劲松,夏军,李运怀.2005.西藏洛扎地区拆离断层构造变形特征.大地构造与成矿学,29(2):189-197.
穆剑,汪立群.1999.论柴达木盆地冷湖-南八仙构造带的含油气远景.石油学报,20(2):18-22.
青海地质矿产局.1991.青海区域地质志.北京:地质出版社.
尚尔杰.2001.柴达木盆地北缘西段第三系构造基本样式及石油地质意义.现代地质,15(4):421-424.
王步清,肖安成,程晓敢,何光玉,陈汉林,杨树锋.2005.柴达木盆地北缘右行走滑冲断构造带的几何学和运动学.浙江大学学报(理学版),32(2):225-230.
王步清.2005.柴北缘晚第三纪以来走滑冲断构造带的几何学和运动学(博士学位论文).杭州:浙江大学.
王明儒.2001.柴达木盆地中新生代三大含油气系统及勘探焦点.西安石油学院学报(自然科学版),16(6):8-12.
杨明慧.1998.张盆压岭型地洼盆地的基本特征及其大地构造演化.大地构造与成矿学,22(3):198-208.
张守仁,戴俊生,曹代勇,李剑红.2000.柴达木盆地北缘块断带扭动构造与阿尔金构造体系的关系.大地构造与成矿学,24(3):218-223.
Yue Yongjun and Liou J G.1999.Two-stage evolution model forthe Altyn Tagh Fault,China.Geology,27(3):227-230.