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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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Sequence Characteristics of Foreland Basin and Its Difference from Those of Other Types of Basin

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Journal of Earth Science 2011年第6期22卷 737-754页

作者：纪友亮潘春孚周勇朱如凯高志勇杨杰琦于刚 College of Geosciences China University of Petroleum Langfang Branch of PetroChina Exploration and Development Research Institute Research Institute of Petroleum Exploration and Development Petro China

Based on the case history study of sequence stratigraphic framework,sequence model,and the controlling factors on sequence formation in the southern Junggar foreland basin,a contrasting comparison of the characteristics among the foreland basin,the faulted basin,and the sag basin is made in the aspects of sequence architecture,filling style,the controlling factors on sequence development,the migrations of basin center and depocenter,etc..The current study results show that there are major differences and these are documented as follows.（1） The accommodation space in foreland basin is mainly created by the subsidence caused by thrusting and napping in the foothill belt,resulting in progradational-dominated parasequence sets in the foothill area and retrogradational parasequence sets in the ramp region.（2） The accommodation space in an open-lake system in faulted basin is mainly created by the activities of the basin margin faults;thus,tectonic sequences are ***,in the closed-lake system,the subaqueous accommodation is mainly controlled by climatic-influenced lake-level fluctuations,and climatic sequence is formed.（3） In sag basin,a closed-lake system is easily formed due to its generation often within the cratons and isolation from the sea,and its accommodation space creation is mainly controlled by climatic lake-level fluctuations;thus,the sequence architecture in sag basin is similar to that formed on the passive continental margin.

关键词： foreland basin faulted basin sag basin sequence architecture stacking pattern sedimentary response to tectonism pattern dif-ferentiation.

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