石油实验地质2018，Vol.40Issue(2)：168-176,9.DOI:10.11781/sysydz201802168
东海盆地西湖凹陷花港组储层孔隙演化与油气充注关系
Relationship between porosity evolution and hydrocarbon charging in tight sandstone reservoirs in Oligocene Huagang Formation, Xihu Sag, East China Sea Basin
摘要
Abstract
The pore evolution of tight sandstone reservoirs in the Oligocene Huagang Formation in the central and northern parts of the central reversal structural belt in the Xihu Sag of the East China Sea Basin was recovered based on the analyses of reservoir properties, burial history and thermal evolution history, and using cast thin section identification,scanning electronic microscope,electron microprobe,fluid inclusion analyses and porosity recovery quantified calculation. The relationship between porosity evolution and hydrocarbon charging was also discussed. The results showed that the porosity evolution in the Huagang Formation can be classified into three stages:14.28% in the stage B of early diagenesis,10.35% in the stage A of middle diagenesis, and 8.75% in the stage B of middle diagenesis,accompanied by three stages of hydrocarbon charging. The first(19-17 Ma) and second(17-7 Ma)stages of hydrocarbon charging took place before the end of stage A of middle diagenesis. The reservoirs were not tight yet,and the acidic fluid brought by hydrocarbon charging played an important role in reservoir reformation,providing favorable porosity and permeability for later hydrocarbon charging. The third stage(7-0 Ma)of massive hydrocarbon charging happened from the end of stage A to the stage B of middle dia-genesis,when reservoirs compacted gradually. The third section of Huagang Formation, buried shallow and was not tight yet,showed relatively better reservoir properties and became a main charging target. It is now the most favorable hydrocarbon exploration target for the Huaguang Formation in the overall densification background.关键词
孔隙演化/油气充注/花港组/渐新统/西湖凹陷/东海盆地Key words
porosity evolution/hydrocarbon charging/Huagang Formation/Oligocene/Xihu Sag/East China Sea Basin分类
能源科技引用本文复制引用
刘勇,徐国盛,曾兵,徐昉昊,张武,高耀,袁海锋..东海盆地西湖凹陷花港组储层孔隙演化与油气充注关系[J].石油实验地质,2018,40(2):168-176,9.基金项目
"十三五"国家重大专项项目"深层优势储层孔喉结构及成岩环境分析技术"(2016ZX05027002-006)资助. （2016ZX05027002-006）
