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DOI	10.1306/10031817417
	The geometry of fluvial channel bodies: Empirical characterization and implications for object-based models of the subsurface
	Colombera L.; Mountney N.P.; Medici G.; West L.J.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:4
英文摘要	The distribution of channel deposits in fluvial reservoirs is commonly modeled with object-based techniques, constrained on quantities describing the geometries of channel bodies. To ensure plausible simulations, it is common to define inputs to these models by referring to geologic analogs. Given their ability to reproduce complex geometries and to draw upon the analog experience, object-based models are considered inherently realistic. Yet this perceived realism has not hitherto been tested by assessing the outputs of these techniques against sedimentary architectures in the stratigraphic record. This work presents a synthesis of data on the geometry of channel bodies, derived from a sedimentologic database, with the following aims: (1) to provide tools for constraining stochastic models of fluvial reservoirs in data-poor situations, and (2) to test the intrinsic realism of object-based modeling algorithms by comparing characteristics of the modeled architectures against analogs. An empirical characterization of the geometry of fluvial channel bodies is undertaken that describes distributions in (and relationships among) channel-body thickness, cross-stream width, and planform wavelength and amplitude. Object-based models are then built running simulations conditioned on six alternative, analog-informed parameter sets, using four algorithms according to nine different approaches. Closeness of match between analogs and models is then determined on a statistical basis. Results indicate which modeling approaches return architectures that more closely resemble the organization of fluvial depositional systems known from nature and in what respect. None of the tested algorithms fully reproduce characteristics seen in natural systems, demonstrating the need for subsurface modeling methods to better incorporate geologic knowledge. Copyright ©2019. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Geologic models; Geometry; Stochastic systems; Stratigraphy; Complex geometries; Depositional system; Fluvial reservoirs; Object-based modeling; Object-based models; Running simulations; Sedimentary architecture; Stratigraphic records; Stochastic models; channel hydraulics; depositional environment; empirical analysis; fluvial process; geometry; hydrological modeling; reservoir; stochasticity; subsurface flow
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/125027
作者单位	School of Earth and Environment, University of Leeds, Leeds, United Kingdom
推荐引用方式 GB/T 7714	Colombera L.,Mountney N.P.,Medici G.,et al. The geometry of fluvial channel bodies: Empirical characterization and implications for object-based models of the subsurface[J],2019,103(4).
APA	Colombera L.,Mountney N.P.,Medici G.,&West L.J..(2019).The geometry of fluvial channel bodies: Empirical characterization and implications for object-based models of the subsurface.AAPG Bulletin,103(4).
MLA	Colombera L.,et al."The geometry of fluvial channel bodies: Empirical characterization and implications for object-based models of the subsurface".AAPG Bulletin 103.4(2019).