塔里木盆地卡拉沙依组砂泥岩段地层对比与沉积相研究

综合大量岩心分析,多口井的测井、录井岩性及野外露头等资料,对塔里木盆地石炭系卡拉沙依组砂泥岩段进行了地层对比及地层接触关系的研究,并对该段的沉积相类型及其平面展布进行了系统分析。研究表明:卡拉沙依组砂泥岩段在盆地大部分地区发育砂泥岩沉积,塔东南地区沉积物较粗,塔西南地区砂泥岩中含有膏盐岩,并且该段与上覆含灰岩段地层为不整合接触关系;该段在盆地大部分地区应是以河流—三角洲的陆相沉积为主,向西南方向直到巴楚及其以西地区才开始发育潮坪、潟湖—开阔台地的海相沉积。塔里木盆地在该时期总体为东高西低的古地貌格局,其物源来自盆地东侧方向。

Stratigraphic correlation and sedimentary facies of the sandstone and mudstone section in the Kalashayi formation of Tarim Basin

The sandstone and mudstone section in the Carboniferous Kalashayi formation of Tarim Basin has been studied and analyzed for stratigraphic correlation,strata contact relationship,and the types and distribution of sedimentary facies based on a huge data of core observation,outcrop,wireline logging,mud logging and outcrops. The study shows that the Kalashayi formation had developed interbedded sandstone and mudstone section across most part of the basin;the sediments are coarse toward southeast and contain gypsum-salt rock in the southwest;the sandstone and mudstone section is in unconformable contact with overlying limestone formation and dominated by continental sedimentation of fluvial-delta facies in most of the basin,and there starts to occur marine facies of tidal flat,lagoon and open platform from Bachu to the southwest. The palaeogeomorphology of Tarim Basin in this stage was high in the east and low in the west,with sediment source coming from the east of the basin.