海洋地质前沿2026，Vol.42Issue(8)：46-57,12.DOI:10.16028/j.1009-2722.2026.008
丽水-椒江凹陷古新统不同物源下沉积体系储层品质研究及优选
A comparative study on reservoir quality of different Paleocene depositional systems in the Lishui-Jiaojiang Sag
摘要
Abstract
The Lishui-Jiaojiang Sag,a Paleocene rift basin,varies significantly in reservoir quality among differ-ent depositional systems of multiple provenances.To characterize the reservoirs of various depositional systems and identify favorable exploration prospects,we integrated data from cores,well logs,seismic surveys,and labor-atory analyses to identify various depositional systems and compare reservoir quality of similar sandstone types and burial depths.Results show that the Lishui Sub-sag B developed two depositional systems in the Cenozoic:shallow-marine submarine fans and sand bars,and they both originated in the southern Zhemin Uplift.The sand-stone types are predominantly litharenite rich in volcanic lithics.At similar burial depths,sand bars are under strong hydrodynamic conditions and repeated winnowing,resulting in better grain roundness and sorting,lower content of plastic volcanic lithics,and consequently superior reservoir quality compared to those of submarine fans.In the Lishui Sub-sag A,Sub-sag C,and Jiaojiang Sag,braided delta and fan delta depositional systems were developed,from the source areas of northern Zhemin Uplift and the Yandang Uplift.The reservoirs are character-ized by relatively high porosity and permeability,due to higher contents of metamorphic lithics and felsic miner-als that are resistant to mechanical compaction.Under similar burial depths,the reservoir quality of conglomer-ates and coarse-grained sandstone in the proximal braided delta fronts and fan delta fronts is significantly better than that of fine-grained sandstone in distal delta front settings.Grain size is the pivotal factor for high-quality reservoirs in this region.Therefore,we recommended that in the Lishui Sub-sag B,priority exploration shall be directed to sand bars and amalgamated channels and channelized lobes in proximal submarine fans and relatively high maturity.In the Lishui Sub-sag A,Sub-sag C,and Jiaojiang Sag,the proximal delta front areas,along with distal high-energy coarse-grained"sweet spots",have superior reservoir quality and hold promising exploration potential.关键词
丽水-椒江凹陷/古新统/沉积体系/储层品质/断陷盆地Key words
Lishui-Jiaojiang Sag/Paleocene/depositional systems/reservoir quality/rift basin分类
海洋科学引用本文复制引用
常文琪,覃军,唐贤君,马清,黄山..丽水-椒江凹陷古新统不同物源下沉积体系储层品质研究及优选[J].海洋地质前沿,2026,42(8):46-57,12.基金项目
中海石油有限公司前瞻基础研究项目"东海中新生代盆地构造-沉积演化及成烃条件"(KJQZ-2026-2006) （KJQZ-2026-2006）
