高邮凹陷深凹带中浅层盖层条件综合评价  

Comprehensive evaluation of medium-shallow caprocks conditions in deep depression zone of Gaoyou Sag

作　　者：仇永峰[1] QIU Yongfeng(Exploration and Development Research Institute of Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China)

机构地区：[1]中国石化江苏油田分公司勘探开发研究院,江苏扬州225009

出　　处：《复杂油气藏》2022年第1期8-12,共5页Complex Hydrocarbon Reservoirs

基　　金：江苏石油勘探局科研项目“高邮凹陷上含油气系统成藏机理研究”(JD06001)。

摘　　要：盖层是高邮凹陷中浅层油气成藏的主要控制因素之一,在统计研究区100多口已钻井泥岩数据的基础上,对中浅层盖层宏观分布和封闭特征开展了综合评价。研究表明,高邮深凹带中浅层发育戴一段一亚段和垛一段六亚段两套较好的区域盖层,具有平面分布相对稳定、单层泥岩厚度较大、泥岩含量高等特征;盖层封闭类型主要是物性封闭,其排替压力较高,封闭性好。根据盖层分级评价结果,认为两套盖层对油气分布控制作用明显,戴一段一亚段盖层条件好,覆盖范围大,戴一段油气藏基本分布在Ⅰ类盖层覆盖范围内;垛一段大部分油气藏为Ⅱ类盖层所覆盖。研究结果对高邮凹陷中浅层油气勘探具有指导意义。Caprock is one of the main factors of hydrocarbon accumulation in Gaoyou sag’s middle and shallow layers. A comprehensive evaluation of the macro-distribution and sealing characteristics of the medium-shallow caprocks was carried out using data from more than 100 well-drilled mudstones in the study area. The results show that two sets of regional caprocks,E2d11and E2s16,have developed in the middle and shallow layers of Gaoyou Deep Sag,with characteristics such as relatively stable planar distribution,large single-layer mudstone thickness,and high mudstone content;the type of layer sealing is primarily physical,with a high displacement pressure and good sealing performance.According to the classification and evaluation results of caprocks,it is believed that the two sets of caprocks have obvious control effects on oil and gas distribution,the E2d11caprock has good conditions and a large coverage area,and the oil and gas reservoirs in the first member of the Dainan Formation are mainly distributed in the coverage of class I caprock;most of the oil and gas reservoirs in the Duoyi member are covered by type II caprock. The results of the study have significance for Gaoyou Sag’s medium and shallow oil and gas exploration.

关 键 词：盖层分布 物性封闭 综合评价 中浅层 高邮凹陷 

分 类 号：TE132[石油与天然气工程—油气勘探]