Sequence Stratigraphic Classification and Sedimentary Facies Feature in Yuejinsihao-Zhahaquan Area in Qaidam Basin
详细信息
- 责任者：Zhong Shanglun (No.2 Production Plant ; Qinghai Oilfield Company ; PetroChina ; Dunhuang 736202 ; China) ; Meng Shu
- 刊名：Xinjiang Petroleum Geology
- 出版年：2013
- 卷期：34(1)
- 关键词：层序地层学 ; sequence stratigraphy ; 砂岩储集层 ; sandstone reservoirs ; 柴达木盆地 ; Qaidam Basin
- 页码：p.53-55
- 图表：illus., 7 refs.
- 分类号：1200
- issnNo：ISSN1001-3873
- isbnNo：CN65-1107/TE
摘要
The Paleocene-Neocene in Yuejinsihao in Qaidam basin is a complete cycle of first-grade sequence,with coarse-fine-coarse grain sizes from the top to the bottom,and can be further divided into three secondary-grade sequences.According to related paleontology,sedimentary structure,grain size,geochemical,lithologic and electrical characteristics,four sub-facies in this area could be recognized,such as shallow lake,shore lake,delta plain and delta front.Accordingly,six microfacies can be classified,including mud flat,lime mud flat,marl flat,algal hill,branch channel,branch inter-sag and splay.The first and second sequences in the secondary-grade one are obviously influenced by Faults No.Ⅶ and No.Ⅷ,and deposits and reservoir physical property of the upthrow and downthrow have great differences,so the favorable reservoirs could be distributed in the upthrow.
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