苏北盆地溱潼凹北坡阜三段储层成岩作用特征

DIAGENETIC CHARACTERISTICS OF RESERVOIR ROCK FOR THE FUSAN MEMBER IN THE NORTHERN SLOPE OF THE QINGTONG DEPRESSION IN THE NORTH JIANGSU BASIN

程晓玲 朱建辉 赵永强 李海华 朱宏发 罗月明

CHEN Xiaoling ZHU Jianhui ZHAO Yongqiang LI Haihua ZHU Hongfa LUO Yuemin

中国石化, 石油勘探开发研究院, 无锡实验地质研究所, 江苏, 无锡, 214151

Wuxi Research Institute of Expermental Geology, SINOPEC, Wuxi, Jiangsu 214151, China

该文基于溱潼北坡24口井阜三段岩心砂岩储层铸体薄片及普通薄片的分析,对成岩作用与储层孔渗的关系、各区段储层的成岩作用特征及成岩序列进行了研究。结果表明,溶蚀作用是本区主要的建设性成岩作用,溶蚀孔隙在纵向上具有一定的分带性,其主要分布在埋深2350～2880m。压实、方解石胶结作用是本区主要的破坏性成岩作用,早期压实使原生孔隙呈线性下降,晚期压实的成岩效应是破坏次生孔隙,方解石胶结具有西部强于东部的特点。平面上,各区成岩作用发育程度不均,莫庄强溶蚀,茅山溶蚀较强、局部层段方解石强胶结,叶甸—边城方解石胶结较强,戴南南部强压实。最后从成岩的角度对本区储层进行评价和预测。

Based on the mould thin section and thin section analysis of cores from the Fusan Member of 24 wells in the northern slope of the Qingtong Depression, the diagenetic characteristics, diagenetic phases and their relationship with the porosity and permeability of reservoir rock were studied. The results indicated that dissolution was the essential favorable diagenesis for the generation of secondary porosity, which was especially well deve loped in the interval of 2 350-2 880 m depth. And compaction and calcitic cementation were the main cause of decreasing porosity. In general, calcitic cementation was more severe in the west than in the east of the study area. In terms of diagenetic stages, there were clear differences in different areas: strong dissolution was occured in Mozhuang area; medium dissolution with strong calcitic cementation in some intervals was developed in Maoshan area; calcitic cementation was common in Yedian-Biancheng area; and South Dainan was characterized by strong compaction. In accordance with the diagenetic characteristics, the reservoirs in the study area were assessed.

中国石化新星石油公司科研项目(XYK-99-53)

https://doi.org/10.11781/sysydz200204339