【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下油砂山组(N2xy)沉积时,只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南翼露头发育一套约650 m厚的N2xy灰色砾岩;第二,二维地震测线QY0680和CDM1150以及露头剖面表明,在N2xy沉积时,不整合地面构造及其附近约190 km2的区域呈一个北西走向的剥蚀区,该剥蚀区有效地分隔了红三旱一号物源体系和牛鼻子梁物源体系;第三,在N2xy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。在综合研究的基础上,提出在N2xy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。更多还原

【Abstract】 People commonly considered that in Hongsanhanyihao-Niubiziliang area in piedmont of Altun mountain in western Qaidam basin there is alone alluvial fan-braided river delta-lake depositional system formed by Niubiziliang sedimentary provenance flowing towards the southwest in period of the Lower Youshashan formation(N2xy).It is hard to explain the following facts by this point of view: 1) a set of gray conglomerate of N2xy in thickness of about 650 m lies to the outcrop of south side of Hongsanhanyihao structure;2) it is confirmed from 2-D seismic lines of QY0680 and CDM1150 that a denudation zone about 190 km2 in trend of NW in the unconformity and its surroundings,which separates Hongsanhanyihao system from Niubiziliang system;3) Niubiziliang system is an old nose-like structure extending to the southeast of Altun mountain and plays a barrier part in the source materials in north of Niubiziliang area flowing or moving towards the southwest.This paper presents the fan delta-offshore/shallow lake beach/bar system developed in this studied area,which is controlled by Hongsanhanyihao provenance,the west valley of Niubiziliang provenance and the source material in north of Well Niucan-1.更多还原