Characteristics of the"Fan-Braid"Complex and Main Controlling Factors of Favorable Reservoir in the Enping Formation,Huizhou 26 Sag,Pearl River Mouth Basin
Peng Guangrong
Liu Pei
Song Penglin
Gao Xiang
Xiong Wanlin
Xiang Qiaowei
Han Bo
Abstract：A unique"fan delta-braided river delta"composite sedimentary system is developed in Enping Formation,Huizhou 26 depression,the Pearl River Mouth Basin,and typical"fan braid"system transformation has occurred in different sedimentary evolution stages of different structures.The reservoir physical conditions before and after the transformation are quite different,so it is urgent to carry out in-depth research.Based on three-dimensional seismic data and core testing data,this article comprehensively analyzes the differential distribution characteristics and main controlling factors of the"fan-braid"composite system reservoir in the Enping Formation of Huizhou 26 Depression,and clarifies the"fan-braid"evolution relationship of the"southern fan northern braid,early fan late braid"in the region;At the same time,the three main controlling factors for the development of high-quality reservoirs in this composite system,namely"superior facies-transformation-volcano",have been deeply revealed.Among them,high-quality sedimentary facies are the material basis for the development of high-quality reservoirs,transformation of multi-level fault stage transportation,and lake wave washing under the background of ancient uplift are the key to improving reservoir physical properties,while differential diagenetic evolution of volcanic materials plays a regulatory role in reservoir physical properties.Relatively speaking,the overall physical properties of the braided river delta facies reservoirs in the Enping Formation of Huizhou 26 Depression are good,but it is still necessary to search for favorable reservoir development zones that are less affected by volcanic materials above the lower burial depth limit;And for the subfacies of the fan delta front,it is necessary to strengthen the research on the transformation effect and select the reservoirs under strong transformation effect.
Keywords：fan deltabraided river deltatransformation effectdiagenesisreservoir physical propertiesmain control factorpetroleum geology
Publication Date：2025-08-30
Online Publishing Date：2025-08-22(First online date of this platform, not the publication date of the document)
Pages：14( 3199-3212 )