【摘 要】
：
塔里木盆地东河砂岩是重要的产油层位,在塔中、塔北等地区已发现东河塘、塔中4、哈德逊、轮南59和塔中6等许多油气藏/田.长期以来,东河砂岩做为一套砂体进行研究和勘探,并认为东河砂岩是晚泥盆世一早石炭世逐层超覆的穿时地层单元.本文根据全盆地约160口钻井和8条重点区域二维地震大剖面和部分三维地震资料,建立了全盆地东河砂岩井一震层序地层格架,将巴楚组到卡拉沙依组的中泥岩段划分为一个三级层序,其中巴楚组的
【机 构】
：
中国石油勘探开发研究院,北京 100083,中国 塔里木油田公司勘探开发研究院,库尔勒 84100
【出 处】
：
1st International Palaeogeography Conference(第一届国际古地理学会议)
论文部分内容阅读
塔里木盆地东河砂岩是重要的产油层位,在塔中、塔北等地区已发现东河塘、塔中4、哈德逊、轮南59和塔中6等许多油气藏/田.长期以来,东河砂岩做为一套砂体进行研究和勘探,并认为东河砂岩是晚泥盆世一早石炭世逐层超覆的穿时地层单元.本文根据全盆地约160口钻井和8条重点区域二维地震大剖面和部分三维地震资料,建立了全盆地东河砂岩井一震层序地层格架,将巴楚组到卡拉沙依组的中泥岩段划分为一个三级层序,其中巴楚组的东河砂岩段—下泥岩段—生屑灰岩段为海侵体系域.将东河砂岩的相关层段划分为4套准层序组,这4套准层序组控制了全盆地东河砂岩的砂体和储盖组合分布.准层序组Ⅰ分布于盆地西部的群苦恰克地区,自西向东,砂体厚度从100m减薄至20m左右,在康1井附近超覆尖灭.沉积相带依次由浅海至临滨再到前滨.准层序组Ⅱ沉积范围扩大,分布于整个中西部地区,向东、向南呈超覆尖灭分布.东部边界大致在塔中51井—伊敏4井—乡3井一带,砂岩厚度50-20 m.沉积相自西向东由浅海向临滨、前滨逐渐过渡,塔北—塔中—巴楚东部地区为宽阔的滨岸前滨,中部地区为临滨；盆地西部为浅海陆棚相泥岩.准层序组Ⅲ海域范围扩大,除轮南低凸起外广泛分布.砂岩厚度平均为10-30m,以塔北东河塘—哈拉哈塘地区最厚,为50-90m.沉积相呈明显的南北分异,塔北地区—巴楚隆起周缘以前滨—临滨为主,塔中地区以滨岸相砂坝沉积为主,盆地内部广大地区以浅海陆棚相泥岩为主.准层序组Ⅳ海侵范围进一步扩大,在全盆地广泛发育,以混积滨浅海—碳酸盐岩台地沉积为主.北部坳陷及其以南地区以广阔的碳酸盐岩台地沉积为主.塔北地区以混积浅海陆棚为主,在跃南—哈德北—羊屋为水下低隆,发育沿岸砂坝.通过不同准层序组分布和岩相古地理演化,准层序Ⅰ-Ⅱ时期,表现为东高西低的东西分异,准层序组Ⅲ-Ⅳ时期,为北高南低的南北分异,东河砂岩砂体分布主要受控于古地貌、物源和海平面升降三个因素.
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