• 责任者：Ge Zhongwei (Exploration Development Research Institute ; Southwest Oilgas Company ; SINOPEC ; Chengdu 610081 ; China) ; Wei Limin
• 刊名：Geology and Mineral Resources of South China
• 出版年：2013
• 卷期：29(1)
• 关键词：物源分析 ; provenance analysis ; 砂体 ; sand bodies ; 四川盆地 ; Sichuan Basin
• 页码：p.72-78
• 图表：illus., 13 refs.
• 分类号：1003
• issnNo：ISSN1007-3701
• isbnNo：CN42-1417/P

The sources system is less than the other parts of Sichuan basin during deposition of the 2nd member of Xujiahe Formation in Dayi area, and the thickness of Xujiahe Formation is also thinner than others in southwest part of Sichuan basin. Since the controversy of the resources during the existing research, this article analyzed through sedimentary background, lithologic association of outcrop, fine distribution of rock cores, electro-facies, seismic reflection feature and atternation of mineralogical composition, it is believed that：（1）The source is probably the Kangdian ancient land or other palaeohigh around it; （2） It is considered that the depositional environment is in the mouth front braided delta, and the beneficial sandbody include the underwater distributary channels and the bar; （3） Influenced by the amount of sources area, tectonic subsidence, the frequently change of distributary channels, the distributary channels are widely upgrowth in the southwest part of the Dayi structure, and the dis- tributary channels and the mouth bar are overlapped in the main part of the structure; （4） The two types sandbod- ies are frequently overlapped in vertical profile, which formed the continous upgrowth and tremendously sandstone thickness of the 2nd member of Xujiahe Formation. Through the research of sources and sedimentary facies, which deepen the recognition of the sandbody distribution in gas pool, as provided reference for exploration of next phase in this area.