| 乌什凹陷及东部邻区白垩系层序划分与沉积古地理 |
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| 引用本文： | 肖建新,林畅松,刘景彦.乌什凹陷及东部邻区白垩系层序划分与沉积古地理[J].地学前缘,2008,15(2):8-19. |
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| 作者姓名： | 肖建新 林畅松 刘景彦 |
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| 作者单位： | 中国地质大学(北京)能源学院,北京,100083 |
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| 基金项目： | 中国石化西部新区勘探指挥部项目 |
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| 摘 要： | 对乌什凹陷乌参1井的白垩系进行了层序划分,分为5个三级层序,其中亚格列木组只有低位体系域,与其上舒善河组合在一起可分为两个三级层序;巴西盖组分为两个三级层序;巴什基奇克组沉积后受到剥蚀而只剩一个三级层序。亚格列木组的沉积相为冲积扇相和辫状河相。舒善河组由辫状河、湖泊三角洲和湖泊沉积组成,岩性为中至粗粒砂岩和泥质岩。巴西盖组沉积相组合包括辫状河三角洲相、扇三角洲、湖泊三角洲和湖泊相并夹有滨浅湖相。巴什基奇克组由低位体系域的冲积扇相、扇三角洲相和湖进体系域的浅湖沉积组成。地震反射特征指示乌什凹陷白垩系沉积具有南北双向物源的特征。北部物源为南天山褶皱带,南部物源为温宿凸起。砂岩碎屑成分分析表明乌什凹陷与东部邻区白垩系存在三个较为明显的物源区,即(1)天山南侧的再循环造山带,(2)温宿凸起再循环造山带快速抬升区,(3)塔北隆起或东、东南方向的大陆蚀源区。它们控制了白垩系沉积相带在研究区的展布。绘制的乌什凹陷及东部邻区白垩系巴什基奇克组沉积古地理图对今后在该区的油气勘探有参考意义。乌参1井白垩系储集岩分布于舒善河组、巴西盖组和巴什基奇克组低位和高位体系域,储集岩类型以含砾粗砂岩、含砾中砂岩和中砂岩为主,它们与其上的湖相泥岩组成三套储盖组合。乌什凹陷白垩系具有良好的油气勘探前景。
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| 关 键 词： | 乌什凹陷 白垩系 层序地层 沉积古地理 |
| 文章编号： | 1005-2321(2008)02-0008-12 |
| 修稿时间： | 2008年1月7日 |
Depositional palaeogeography and division of Cretaceous sequence of Wushi depression |
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| Xiao Jianxin,Lin Changsong,Liu Jingyan.Depositional palaeogeography and division of Cretaceous sequence of Wushi depression[J].Earth Science Frontiers,2008,15(2):8-19. |
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| Authors: | Xiao Jianxin Lin Changsong Liu Jingyan |
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| Abstract: | The Cretaceous sequence of well Wucan No.1 in Wushi Depression is divided into five 3rd-order sequences.The Yageliemu Fm.has only the lower system tract.The Yageliemu Fm.and Shushanhe Fm.together can be divided into two 3rd-order sequences,and the Baxigai Fm.divided into two 3rd-order sequences.The Bashijiqike Fm.has only one 3rd-order sequence left.The Yageliemu Fm.has!the facies of alluvial fans and braided rivers.The Shushanhe Fm.has the facies composed of braided rivers,lake deltas and lake muddy deposits,with the lithology from coarse-middle sandstones to argillaceous rocks.The Bashijiqike Fm.has the facies of braided river deltas,fan deltas,lake deltas and lake,interbedded with coastal lake facies.The Bashijiqike Fm.has the lower system tract composed of alluvial fan,fan delta facies,and the transgressive system tract of shallow lake facies.The seismic reflections show that the Cretaceous deposits in Wushi Depression came from two directions,the Tianshan mountain on the north and Wensu uplift on the south.The clastic composition analyses of sandstones indicate that there are three provenances:1) the recycling orogenic belts on the southern Tianshan;2) the rapid uplifting area of the recycling orogenic belts in the Wensu uplift;3) the continent erosion areas in the Tabei uplift or in somewhere to the east or southeast of the studied area,existing in the Cretaceous.They controlled the distribution of sedimentary facies belts in the studied areas in the Cretaceous.The depositional palaeogeographic map of Bashijiqike Fm.in the Cretaceous may serve as a reference for oil and gas exploration in the Wushi Depression and its adjacent areas in the east.The reservoirs of Wucan well 1 are developed in the lower or higher system tracts of Shushanhe Fm.,Baxigai Fm.and Bashijiqike Fm.in the Cretaceous,and have the rocks of pebbled coarse sandstones,pebbled medium sandstones and medium sandstones,which make three sets of reservoir-cap assemblages with the lake mudstones above them.There are prospects of finding oil and gas in the Cretaceous in the Wushi Depression. |
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| Keywords: | Wushi Depression Cretaceous sequence stratigraphy depositional palaeogeography |
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