塔里木盆地东河砂岩段准层序组特征及岩相古地理与砂体分布

发布时间：2018-06-26 14:30

  本文选题：东河砂岩段 + 准层序组　； 参考：《石油学报》2017年02期

【摘要】：东河砂岩段是塔里木盆地最重要的海相碎屑岩油气勘探层位,广泛分布于全盆地。为进一步解决东河砂岩段内部砂体对比与分布问题,将东河砂岩段进行了层序格架内的细分层和沉积相分布研究。利用全盆地110余口井和重点区域地震大剖面,将塔里木盆地晚泥盆世—早石炭世的东河塘组—巴楚组划分为一个层序,东河砂岩段—生屑灰岩段细分为4个具有区域对比意义的准层序组,恢复了以准层序组为单元的岩相古地理与砂体分布。准层序组I和Ⅱ为低位体系域,准层序组III和IV为海侵体系域。准层序组I早期低位体系域沉积局限于塔西南地区西部,以临滨至前滨亚相为主。准层序组Ⅱ晚期低位体系域沉积分布于塔里木盆地的中西部地区,以宽阔的前滨、临滨亚相为主;塔北—塔中—巴楚地区东南部为宽阔的滨岸前滨—临滨亚相,盆地中部为临滨—过渡带亚相;盆地西南部为滨外浅海亚相泥岩。准层序组III早期海侵体系域沉积范围扩大,塔北—巴楚地区以滨岸相前滨—临滨亚相为主,塔中地区以滨岸相砂坝为主,盆地内部广大地区以滨外浅海亚相泥岩为主。准层序组Ⅳ晚期海侵体系域沉积范围达最大,盆地中部以广阔的碳酸盐台地相为主,塔西南地区为局限、半局限台地相,塔北地区以混积浅海相为主,在跃南—羊屋—轮古井区发育滨岸相沿岸砂坝。全盆地东河砂岩段的砂体分布主要受控于海平面抬升、古隆起或古地貌、物源等,提出的准层序组格架内的砂体分布模式指导并得到了生产钻井的证实。
[Abstract]:Donghe sandstone formation is the most important oil and gas exploration horizon of marine clastic rocks in Tarim Basin and is widely distributed throughout the basin. In order to further solve the problem of sandbody correlation and distribution in the Donghe sandstone section, the subdivision and sedimentary facies distribution in the sequence framework of the Donghe sandstone member are studied. The Donghetang formation and Bachu formation of the late Devonian and early Carboniferous in the Tarim Basin are divided into a sequence by using more than 110 wells and large seismic profiles in the key regions of the basin. The Donghe sandstone-bioclastic limestone member is subdivided into four regional correlation sequences, and the lithofacies paleogeography and sandbody distribution with the quasi-sequence formation as the unit is restored. The quasequence groups I and II are low system tracts, and the quasi-sequence groups III and IV are transgressive system tracts. The deposition of early low system tracts in the early stage of sequence formation I is confined to the western part of southwest Tata, and the main facies is from the shore to the foreshore. The deposition of the lower system tract in late stage 鈪，

本文编号：2070689