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准噶尔盆地乌夏断裂带构造演化及油气聚集
冯建伟1,戴俊生1,葛盛权2
(1.中国石油大学地球资源与信息学院,山东东营257061;2.中石油塔里木油田分公司,新疆库尔勒841000)
摘要:
针对乌夏断裂带构造变形十分复杂,油气地质条件多变,油气成藏条件极不均衡,勘探程度尚低的状况,应用 断层生长指数分析法和深层地震相分析法,对该地区进行了构造层和构造单元划分及变形特征、火山岩和油气生储 盖组合分析。结果表明:乌夏断裂带具有多期叠瓦冲断和分段性构造特征,从石炭纪末洋壳俯冲结束、弧陆强烈碰 撞造山活动后,经历了前陆盆地短期伸展火山活动、前陆盆地前展逆冲-断展褶皱、陆内坳陷后展逆冲-断展褶皱、陆 内坳陷压张转换和整体抬升剥蚀4个演化阶段,各阶段有着不同的沉积特征,发育不同的沉积旋回。构造演化不仅 控制着烃源岩的分布和油气生成,形成了多套断裂体系和地层不整合面,同时也控制着油气成藏期次和运聚过程。 受构造演化的多旋回性及储盖组合的联合控制,乌夏断裂带共有4期油气充注过程,油气沿玛湖凹陷呈环带状分布。
关键词:  乌夏断裂带  构造演化  断裂系统  沉积特征  油气聚集
DOI:
分类号:
基金项目:中石油总公司2005—2009年重点项目
Structural evolution and pool-forming in Wuxia fault belt of Junggar Basin
FENG Jian-wei1,DAI Jun-sheng1,GE Sheng-quan2
(1. Faculty of Geo-Resource and Information in China University of Petroleum, Dongying 257061 y Shandong Pra ;2. Tarim Oilfield Branch Company of PetroChina, Korla 841000, Xinjiang, China )
Abstract:
Aimed at complexed structural deformation,varied geologic conditions,disproportion petroleum accumulation conditions and low exploration degree,division of structural layers and structural units, deformation feature,volcanic events and oil-gas assemblage of Wuxia fault belt were analyzed by the analysis methods of growth index of reverse faults and seismic facies. The results show that Wuxia fault belt is characterized by multiphase imbricate-thrust and structural segmentation. After diving of oceanic crust, intense collision and orogenic process in late Carboniferous period, the belt experienced four evolution stages ; momentary extend volcaniticy in weakly compressing foreland basin, revived aflvance fault-fold forland basin,regressive fault-fold inland depression basin, transformational compression-extension inland depression basin and denudation after unlift. The depositonal features of the belt and the dipositional cycles developed in each stage are different. Structural evolution not only controlled distribution of source rock and hydrocarbon generation, but also produced many sets of fault sys-terite and unconformity surfaces to control pool-forming migration stages and accumulation. Controlled by the polycycle property of structural evolution and assemblage, Wuxia belt experienced four pool-forming periods, and the oil and gas circulated around Mahu depression.
Key words:  Wuxia fault belt  structural evolution  fault system  depositional feature  petroleum accumulation
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