沉积与特提斯地质2025，Vol.45Issue(2)：294-304,11.DOI:10.19826/j.cnki.1009-3850.2025.05001
琼东南盆地西区海底扇高温超压储层成岩作用与孔隙演化
Diagenesis and porosity evolution of high-temperature and overpressure sandstone reservoirs in submarine fans of the west area of the Qiongdongnan Basin
摘要
Abstract
Submarine fans in the west area of the Qiongdongnan Basin,located on the continental shelf in the northern of the South China Sea,are the main area for gas exploration.These submarine fans are commonly characterized by high-temperature and overpressure diagenetic environments.A comprehensive analysis was conducted to evaluate diagenesis and porosity evolution of submarine fan reservoirs in the Meishan Formation of the Ledong-Lingshui Sag in the west area of the Qiongdongnan Basin.The analysis incorporates thin-section identification,image analysis,fluid inclusion analysis,clay X-ray diffraction,scanning electron microscope(SEM),and physical property test,with comprehensive consideration of the burial-thermal and hydrocarbon charging history of the reservoirs.The results show that the submarine fan reservoirs are in the A-mesodiagenesis stage,with reservoirs exhibiting low to moderate porosity and low to extra-low permeability.The diagenetic and accumulation sequence progresses as follows:early clay mineral precipitation → first phase of accumulation → feldspar micro-dissolution → second phase of accumulation → quartz overgrowth and intense feldspar dissolution → ferrocalcite and dolomite cementation → quartz and quartz overgrowth dissolution → third phase of accumulation and CO2 charging → micro-dissolution of carbonate cements.The porosity evolution model follows a"first overpressure,later accumulation,and then compaction"pattern,characterized by"significant porosity reduction due to compaction;porosity reduction from ferrocalcite cementation;porosity conservation under overpressure conditions;moderate porosity increase due to dissolution".关键词
琼东南盆地西区/乐东-陵水凹陷/梅山组/海底扇/储层/成岩作用/孔隙演化Key words
west area of the Qiongdongnan Basin/Ledong-Lingshui Sag/Meishan Formation/submarine fan/reservior/diagenesis/porosity evolution引用本文复制引用
胡德胜,李亮,钟佳,满勇,孙文钊,白楠,戴伊宁,柳智萱,袁珍珠,胡锟..琼东南盆地西区海底扇高温超压储层成岩作用与孔隙演化[J].沉积与特提斯地质,2025,45(2):294-304,11.基金项目
国家重点研发项目(2019YFA0708504) （2019YFA0708504）
"十四五"全国油气资源评价项目(QGYQZYPJ2022-3) （QGYQZYPJ2022-3）
