准噶尔盆地乌-夏地区侏罗系层序地层学研究 |
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引用本文: | 杨怀宇,陈世悦,杨俊生,夏雨,张鹏飞,李聪. 准噶尔盆地乌-夏地区侏罗系层序地层学研究[J]. 地层学杂志, 2010, 34(1) |
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作者姓名: | 杨怀宇 陈世悦 杨俊生 夏雨 张鹏飞 李聪 |
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作者单位: | 中国石油大学地球资源与信息学院,山东东营,257061;中国石油新疆油田分公司勘探开发研究院地球物理研究所,新疆乌鲁木齐,830011 |
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基金项目: | 新疆油田公司项目“准噶尔盆地西北缘滚动精细勘探”资助 |
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摘 要: | 以Vail经典层序地层学理论为基础,综合运用乌—夏地区地震、钻井和测井资料,在各层序井—震联合标定的基础上,建立准噶尔盆地西北缘乌—夏地区侏罗系层序格架,将侏罗系划分为2个超层序7个层序,并分析研究了侏罗纪不同层序的展布特征、体系域构成及沉积体系展布。乌—夏地区侏罗纪层序特征在厚度总体上呈现由斜坡区至冲断带(由南至北)厚度减薄的趋势,沉积环境早期(JSQ1—JSQ4)以较干旱的冲积扇、辫状河沉积至中期(JSQ4—JSQ5)的扇三角洲、三角洲和湖泊相类型为特征,晚期(JSQ6—JSQ7)又转变为较浅水的冲积扇、辫状河的沉积环境。
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关 键 词: | 层序地层 层序特征 沉积体系 沉积环境 侏罗系 乌-夏地区 准噶尔盆地 新疆 |
SEQUENCE STRATIGRAPHIC ANALYSIS OF THE JURASSIC STRATA IN WUXIA AREA,JUNGGAR BASIN |
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Abstract: | Based on the theory of sequence stratigraphy, utilizing seismic, drilling and well logging data, and on the basis of log and seismic combined calibration, the Jurassic strata in the Wu-Xia area of the Junggar Basin has been studied. The Jurassic strata in the Wu-Xia area can be divided into 2 supersequences and 7 sequences. The distribution of sequences systems tract composition, and sedimentary system’s distribution are analyzed. Sequence thickness gradually thins from slope area to fold-thrust zone(from south to north) in the Wu-Xia area. Sedimentary environment changed from alluvial fan、braided river, succedent fan-delta、delta and lacustrine facies,eventually to adlittoral alluvial fan and braided riverfacies. Moreover, a lithological trap of top Sangonghe Formation(JSQ4) has been forecasted in sequence framework, which has been recognized that sedimentary facies belts control sandbody of the low-stand system tracts and mudstone caprock of partial high-value areas. Below cap rocks, top sandbody can form semi-lenticular lithological trap, which has some guiding significance to explore subtle reservoir. |
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Keywords: | sequence stratigaphy characteristics of sequence sedimentary system Jurassic Wu-Xia area Junggar Basin |
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