Provenance and Sedimentary System of Lower Youshashan Formation in Hongsanhanyihao-Niubiziliang Area in Western Qaidam Basin

Abstract

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 (N_2xy). It is hard to explain the following facts by this point of view: 1) a set of gray conglomerate of N_2xy 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.

Key words: Qaidam basin, Neogene, sedimentary provenance, paleogeography

CLC Number:

TE111.3

YI Ding-hong, PEI Ming-li, ZHANG Ju-mei, ZHANG Li-ping, WU Wu-jun, ZHAO Fan. Provenance and Sedimentary System of Lower Youshashan Formation in Hongsanhanyihao-Niubiziliang Area in Western Qaidam Basin[J]. Xinjiang Petroleum Geology, 2009, 30(6): 696-698.

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Provenance and Sedimentary System of Lower Youshashan Formation in Hongsanhanyihao-Niubiziliang Area in Western Qaidam Basin

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