古地理学报2025，Vol.27Issue(4)：950-964,15.DOI:10.7605/gdlxb.2025.039
基于深水源汇参数定量表征的陆架边缘分类及其对深水沉积富砂性的预测
Classification of shelf margins based on characterization of deep-water source-to-sink parameters and its implications on finding suitable deepwater reservoirs
摘要
Abstract
The application of the source-to-sink methodology in predicting reservoir occurrence in deep-water hydrocarbon exploration is frequently impeded by the difficulty of quantifying deep-water source-to-sink(S2S)parameters,such as sea-level fluctuations,sediment supply(Qs),and accommodation space(δa).This study establishes a method for quantitatively characterizing these three S2S parameters and identifies suitable deep-water hydrocarbon reservoirs based on the classification of shelf margins.Our findings indicate that sea-level fluctuations can be categorized as either icehouse or greenhouse based on geological age,sediment supply can be distinguished as high or low based on the rates of shelf-edge movement,and accommodation space can be classified as low,medium,or high based on the angles of shelf-edge trajectories.The interaction of these three S2S parameters results in 10 distinct types of shelf margins,each associated with a specific risk level for finding suitable hydrocarbon reservoirs in deep-water areas.Applying these quantitative methods to the Pearl River margin of the SQ13.8 age has led to the identification of three primary types of icehouse margins:high Qs-medium δa,high Qs-low δa,and high Qs-high δa.Shelf-edge trajectories that are slightly falling or rising(-2°＜Tse＜1°)can transport coarse-grained clastics to the deep-water slope,forming sand-rich submarine fans regardless of whether the system is controlled by icehouse or greenhouse sea-level conditions and whether sediment supply is high or low.Moderately rising shelf-edge trajectories(1 °＜Tse＜4°)promote the formation of sandy highstand submarine fans under high sediment supply conditions but are associated with muddy deep-water systems under low sediment supply scenarios.Steeply rising or backstepping shelf-edge trajectories(1°＜Tse＜4° and 90°＜Tse＜180°,respectively)tend to form small-scale sand-rich submarine fans under high sediment supply,while under low sediment supply they are commonly associated with large-scale mud-rich mass-transport depositional systems.According to this shelf-margin classification-based prediction model,icehouse shelf margins with high Qs and low δa show the highest sand-rich potential in deep-water settings.This conclusion is supported by borehole data,which reveal the presence of tens of meters thick sandstones in channelized submarine fans,exhibiting block well-log patterns.These findings validate the effectiveness of the proposed new methods for identifying suitable deepwater reservoirs..关键词
源汇参数/陆缘分类/物源供给/可容空间/储集层预测Key words
source-to-sink parameters/shelf-margin classification/sediment supply/accommodation space/prediction of hydrocarbon reservoirs分类
天文与地球科学引用本文复制引用
张丽丽,谢世文,陈北辰,龚承林,王绪诚,戈道瑶..基于深水源汇参数定量表征的陆架边缘分类及其对深水沉积富砂性的预测[J].古地理学报,2025,27(4):950-964,15.基金项目
中海油有限公司生产性科研项目(编号:SCKY-2023-SHENHAI-02)"、中海油"十四五"重大科技项目(编号:KJGG2021-0100、KJGG2022-0102、KJGG2022-0103)联合资助.[Co-funded by the CNOOC Limited production research project(No.SCKY-2023-SHENHAI-02),and"14th Five Year Plan"Major project(Nos.KJGG2021-0100,KJGG2022-0102,KJGG2022-0103)] （编号:SCKY-2023-SHENHAI-02）
