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Controls of accommodation to sediment-supply ratio on sedimentary architecture of continental fluvial successions

Petroleum Science 2023年第4期20卷 1961-1977页

作者： Wei Li Da-Li Yue Yu-Shan Du Jian Li Chi Zhang Zhi-Qiang Gong Xue-Ting Zhang Qing-Lin Shu Jian Gao National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China Shengli Oil Field Company SINOPECDongyingShandong257015China PetroChina Research Institute of Petroleum Exploration&Development Beijing100083China

The applicability of sequence stratigraphic models to continental fluvial successions has long been topic for debate. To improve our understanding of how fluvial architectures record responses to changes in the ratio between accommodation rate and sediment-supply rate (A/S), two case studies are analyzed, including a densely drilled subsurface fluvial reservoir imaged with a seismic cube, and an outcropping fluvial succession. The subsurface dataset provides a larger, three-dimensional perspective, whereas the outcrop dataset enables observation at higher resolution. On the basis of both datasets, channel-body density, channel-body stacking patterns and their formative river types are interpreted at different scales, and how these may reflect responses to A/S change (the rate of accommodation creation relative to the rate of sediment supply) are discussed. The results indicate that (i) channel-body stacking patterns undergo four evolutionary stages along with the A/S increase, i.e., multi-story, mixed multi- and two-story, two-story, and isolated patterns;(ii) channel-body density decreases along with the channel-body stacking patterns varying from multi-story to isolated;(iii) formative rivers types are interpreted as evolving from braided planforms to braided-meandering planforms and then to meandering ones, with the increase of A/S.

关键词： Channel body Sedimentary architecture Stacking pattern formative river type Sequence stratigraphy A/S

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