Fine Characterization of Source-to-Sink System Based on Sequence Framework—Taking the Phase Ⅲ of Wenchang Formation in Lufeng Sag as an Example
ZHANG Qin
XIAO Zhangbo
LI Zhigao
MAO Zhe
GONG Wen
SHEN Mengrong
Abstract：In the exploration of concealed oil and gas reservoirs in continental rift lake basins,the spatial distribu-tion patterns and reservoir control mechanisms of dominant sedimentary systems are frontier scientific issues in cur-rent oil and gas geological research.In this study,the Phase Ⅲ of Wenchang Formation in Lufeng Sag of Pearl Riv-er Mouth Basin is taken as the research object.Using high-precision three-dimensional seismic,logging,drilling,paleontology and geochemical data,through the quantitative analysis of source-sink system under the constraint of a high-resolution sequence stratigraphic framework,the prediction model of dominant sand body in lowstand sys-tem tract of faulted lake basin is constructed,and the development model of lithologic trap is revealed.The main achievements are as follows:For the first time,the T82_FFS sequence boundary was identified in the third mem-ber of the Phase Ⅲ of Wenchang Formation in the southern gentle slope zone of Lufeng Sag,and the complete low-stand system tract sedimentary system was divided.Four types of source-sink system evolution models are estab-lished:narrow-shallow fault-slot transport type,narrow-deep fault-slot vertical aggradation type,wide-shallow fault-slot lateral migration type,wide-deep fault-slot composite transport type.The wide-deep fault-slot system has the optimal reservoir conditions.Three kinds of lithologic trap development models are constructed.Among them,the upper-super pinch-out trap developed by the wide-deep fault-trough composite transport delta sedimentary body has the greatest exploration potential.Drilling confirmed that the maximum thickness of the single sand body is 38.6 m,and the daily oil production is more than 27 m3/d,and the exploration breakthrough is successfully achieved.The results of this study provide a research paradigm for the exploration of deep subtle reservoirs in fault-ed lacustrine basins based on the source-sink theory system from qualitative to semi-quantitative characterization of dominant sand bodies.
Keywords：Lufeng sagPhase Ⅲ of Wenchang formationSource-sink systemLowstand systems tractDomi-nant sedimentary body
Publication Date：2026-02-28
Online Publishing Date：2026-03-03(First online date of this platform, not the publication date of the document)
Pages：10( 112-121 )