Pattern of Genesis-Based Mudstone Distribution for Sandy Braided River: A Case Study of Sandy Braided-River Outcrop, Datong, Shanxi Province, China
详细信息
- 责任者：Yang Lisha (Northwest Branch ; Exploration and Development Research Institute ; PetroChina ; Lanzhou 730020 ; China) ; Chen Bintao
- 刊名：Natural Gas Geoscience
- 出版年：2013
- 卷期：24(1)
- 关键词：砂岩储集层 ; sandstone reservoirs ; 山西 ; Shanxi Province
- 页码：p.93-98
- 图表：illus., 3 tables, 17 refs.
- 分类号：1003
- issnNo：ISSN1672-1926
- isbnNo：CN62-1177/TE
摘要
Sandy braided river of Yungang Formation which is dominated by sands is composed of three typical lithofacies associations of channel,channel-bar and point bar.It as good oil/gas reservoirs has good reservoir properties,but there is muddy interlayer inside the sandy braided river deposits.According to measurement of typical outcrops of Jurassic sandy braided river in the Datong city,Shanxi province,we identify four genetic types of mudstone in the sandy braided rive deposits,i.e.mud plug,channel lag mud,lateral accretion mud,and flood plain mud.According to genesis types,we take the channels of single stage as basic unit to setup the distribution model of mudstone in the sandy braided river,limit the distribution range of mudstone of each genesis type.The distribution of mud plug,channel lag mud and lateral accretion mud is constrained by channels of single stage,while the distribution of flood plain mud is controlled by active channel zones.The establishment of distribution pattern can provide a concept model for the effective prediction of the geometric shape,rules and scales of spatial distribution for mudstone in reservoirs of sandy braided river.
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