【摘要】 目前普遍认为位于柴达木盆地西部阿尔金山前的红三旱一号-牛鼻子梁地区在新近系上干柴沟组(N1)沉积时主要发育向西南方向流动的牛鼻子梁物源所形成的冲积扇-辫状河三角洲-湖泊沉积体系,这种认识难以解释以下事实:第一,在红三旱一号地面构造第一和第三高点南翼露头剖面均发育一套约350～1 470 m厚的N1杂色砾岩、砂砾岩和含砾砂岩;第二,不整合地面构造南翼露头剖面表明,在N1沉积时,该区域发育厚层灰绿色泥岩夹薄层褐色石膏沉积,为弱水动力条件的浅水湖湾环境;第三,在N1沉积时,牛鼻子梁地区是阿尔金山向东南方向延伸的古鼻梁,该古鼻梁是牛鼻子梁以北地区物源向西南方向流动的屏障。在综合研究该地区的野外露头、钻井、测井、二维地震资料和古地理背景的基础上,提出在N1沉积时,研究区发育由红三旱一号物源、牛鼻子梁西口物源和牛参1井以北物源所控制的扇三角洲-滨浅湖滩坝沉积体系。这一新认识对于重新认识与评价红三旱一号-牛鼻子梁地区石油地质条件及寻找优质有效碎屑岩储层具有重要的勘探实践意义。更多还原

【Abstract】 People commonly consider that the alluvial fan-braided river delta-lake depositional systems,formed by Niubiziliang source transporting towards southwest direction,were developed when Upper Ganchaigou Formation(N1) of Neogene deposited in Hongsanhan No.1-Niubiziliang Area in front of Aerjin Mountain in the west of Qaidam Basin.This recognition can not explain the following facts: first,that a set of N1 variegated conglomerate,glutenite and pebbled sandstone with 350-1470m thickness was developed in the southern outcrop of the first high point and the third high point in Hongsanhan No.1 ground structure;second,that the southern outcrop section of uncomformable ground structure showed that the thick gray green mudstone was interbedded with thin brown gypsum sedimentation developed in shallow-water bays environment when the N1 deposited;thirdly,that Niubiziliang Area was the fossil nose bridge extended from Aerjin Mountain towards southeast direction when the N1 deposited,and the fossil nose bridge was a barrier wall of source provenance transporting towards southwest direction in the northern part of Niubiziliang Area.Based on the research of field outcrops,drilling,well logging,two-dimension seismic data and palaeogeographic setting,it is proposed that the fan delta-shore to shallow lake beach-bar sedimentary system,controlled by the source provenances in Hongsanhan No.1,in the west of Niubiziliang and in the north of Well Niucan 1,was developed in the area when the N1 deposited.This new cognition has important signification in oil and gas exploration for recognizing and evaluating the petroleum geological conditions and looking for high-quality clasolite reservoirs in Hongsanhan No.1-Niubiziliang Area.更多还原