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fan-delta,Braid delta and the Classification of delta Systems

Acta Geologica Sinica(English Edition) 1991年第4期65卷 387-400页

作者： W.E.Galloway Department of Geological Sciences University of Texas at Austin Austin Texas 78713U.S.A.

This paper mainly discusses the origin and deposhional features of fan-deltas and braid deltas. fan-del-tas are storm discharge-dominated, while braid deltas are usually flashy flood-dominated. The two types ofdelta, like common deltas, were reworked by marine processes. delta systems are classified into nine deltatypes on the basis of the subaerial depositional processes and the nature of marine reworking. fan-deltas and braid deltas are of great significance for petroleum exploration. In divergent-marginforeland and intraplate rift-subsided basin settings fan-deltas often form combination traps for petroleum ac-cumulation.

关键词： fan-delta Braid delta and the Classification of delta Systems

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Distribution of Mid-deeply Buried Sand-bodies and their Hydrocarbon Significance at Basin Margins: Case Study of the Paleogene in the Eastern Liuzan Area of the Nanpu Sag, Bohai Bay Basin, China

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Acta Geologica Sinica(English Edition) 2021年第4期95卷 1279-1294页

作者： CUI Lijie JIAN Shikai ZHANG Boming XIE Xiongju LI Liang School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Beijing Ultrado Resources Technology Inc. Beijing 100083China Research Institute of Exploration and Development PetroChina Jidong Oilfield CompanyTangshanHebei 063004China

The current research aims to unlock the temporal and spatial distribution of sand-bodies and their relationship with hydrocarbon accumulation in the mid-deep layer of basin margins, located in the eastern part of the Liuzan area of the Nanpu Sag, Bohai Bay Basin, China. Through this study, the main target interval of the area was divided into two fourthorder sequences. The lean sand mixed sedimentary belt with great importance in controlling hydrocarbon accumulation was identified through the comprehensive use of 3 D seismic data, logging data, lithological data and seismic inversion data. A detailed analysis of sand-body development characteristics and their role in controlling hydrocarbon accumulation was conducted. The results reveal that the study area mainly develops two distinct fan-delta lobes from the NE-trending sediment supply direction. Due to the relatively high influence of the lacustrine transgression event, the scale of the lean sand mixed sedimentary belt within the SQ1-1(the lacustrine transgressive systems tract) is relatively small, showing a relatively continuous distribution of sand bodies in the plane. Conversely, due to the relatively high impact of the lacustrine regression event, the scale of the lean sand mixed sedimentary belt developed within the SQ1-2(the highstand systems tract) is relatively large, the two east sets of fan-delta sedimentary systems being clearly separated. The lean sand mixed sedimentary belt formed a good lateral occlusion belt in favor of hydrocarbon accumulation. Through composite analysis of structural interpretation results, sand-body distribution and well test data, it is evident that the lean sand mixed sedimentary belt located in the structural high is not a favorable zone for hydrocarbon accumulation. In contrast, the wing of the high part of the structure is the zone of sand-bearing bodies and is a favorable zone of hydrocarbon accumulation.

关键词： lithological reservoirs sequence stratigraphy fan-delta sand-body correlation hydrocarbon accumulation

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