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- Title
Architecture Anatomy and Hierarchical Modeling of Sand - Gravel Braided River Reservoirs: A Case study of Zhong32 wells area, Qigu Formation reservoir, Fengceng oilfield.
- Authors
WU XiaoJun; SU HaiBin; ZHANG ShiJie; FENG LiJuan; WANG Jie; YIN SenLin
- Abstract
The sand-gravel braided river reservoir of the Upper Jurassic Qigu Formation in the Fengcheng Oilfield, Junggar Basin, was studied using data for outcrops, cores and dense wells. Pattern-fitting and embedded hierarchical modeling of the reservoir architecture and hierarchy were used to locate the interfaces of different grades. The 5-3 architecture units were identified, and the distribution patterns and 3-D architecture of different levels were established. These indicated that: (1) The sand-gravel braided river 4-level architecture unit in the study area mainly includes two types: braided bar and braided channel. The braided channel includes shale semi-filled channels and argillaceous filling channels. The sand-gravel braided river 3-level architecture unit is composed of an inner channel of the shoal bar and a silt layer. (2) Quantitative analysis of the different hierarchies of the braided river units, including calculation of the size of different sediment grades, indicated that the width of a single sand-gravel channel in the study area is 50-180 m, and the width of a single filled channel is 30-70 m, and they are about 100 m to about 350 m long. The width of a single braided bar was about 120-400 m and about 300-800 m long. The length and width of the silt layer in the inner braided bar were 110-330 m and 60-200 m, respectively. The mini-channel length and width were 100-200 m and about 15-25 m, respectively. (3) A study of the fine architectural anatomy, combined with its distribution pattern, were the basis for constructing a 3-D quantitative embedded architecture model of the study area.
- Publication
Acta Sedimentologica Sinica, 2020, Vol 38, Issue 5, p933
- ISSN
1000-0550
- Publication type
Article
- DOI
10.14027/j.issn.1000-0550.2019.120