摘要
陆架边缘三角洲既是全球深水储层研究的热点对象,也是我国南海深水油气勘探的重要目标。基于对珠江口盆地白云南洼珠海组已钻井、薄片及物性分析,剖析了陆架边缘三角洲储层基本特征,明确了储层发育的主控因素并预测了有利储层分布。研究表明:珠海组各层段均发育三角洲储层,珠海组六段和五段发育陆架三角洲储层,珠海组四段至一段形成陆架边缘三角洲储层,其物性较好,随埋深增大储层物性整体变差。珠海组一段和二段物性最好,为中-高孔、中-高渗储层;珠海组三段和四段储层物性次之,为中-高孔、特低-高渗;珠海组五段和六段储层物性最差,为低孔、特低-低渗。珠海组陆架边缘三角洲储层发育由沉积相带、压实作用和盆地高热流背景联合控制。其中沉积相带提供储层物质基础,优质储层主要发育于陆架边缘三角洲前缘高能相带和近端深水扇,远源相对深埋的深水扇物性变差;压实作用主要发生在珠海组六段和五段,陆架边缘三角洲主体发育时期压实作用不明显;白云南洼古热流值高,促使成岩作用加速,储层物性快速变差,但也易形成次生溶蚀带。“热盆优相”型储层为珠海组油气勘探的最有利储层,主要为珠海组三段至一段的陆架边缘三角洲和深水扇砂体,其中珠海组一段三角洲前缘和深水扇的规模大、物性最好,而珠海组五段和六段油气勘探则应聚焦于优相次生孔隙发育带。
The shelf margin delta of the Zhuhai Formation in the southern subsag of the Baiyun sag in the Pearl River Mouth Basin is a focus for domestic deep-water research and an important deep-water exploration target. Based on the surrounding drilled wells, thin section and physical property analysis data, the characteristics of the reservoirs in Zhuhai Formation are investigated, the main factors affecting physical properties are discussed and favorable reservoir distribution is predicted. The result shows that reservoirs with good physical properties had developed in all the delta intervals of the Zhuhai Formation, and the physical properties of the reservoirs decrease with an increase of burial depth. The 1 st and 2 nd Members of the Zhuhai Formation have the best physical properties. These are mainly medium-high porosity and medium-high permeability. The 3 rd and 4 th Members of the Zhuhai Formation have medium-high porosity, extra low permeability-high permeability. The 5 th and 6 th Members of Zhuhai Formation are relatively poor, and have mainly low porosity and low permeability-extra low permeability. The reservoirs on the shelf margin delta of the Zhuhai Formation are controlled by sedimentary facies belts, compaction, and basin heat flow background. Sedimentary facies belts provide the material basis of the reservoirs, and high-quality reservoirs are developed in the high-energy facies belts of the delta front. The compaction was only strong before the 4 th Member of the Zhuhai Formation, and the compaction was not strong during the main development period of the shelf margin delta. The high geothermal gradient in the southern subsag of the Baiyun sag promotes the acceleration of diagenesis and the deterioration of the physical properties of the reservoir, but it also has led to secondary pore development zones. The threshold of the burial depth of the reservoir physical properties is 2400~2600 m, indicating that the physical properties of the 4 th Member and above of the Zhuhai Formation are relatively good.
作者
舒梁锋
张丽丽
雷胜兰
高中亮
韩霄
于飒
SHU Liangfeng;ZHANG Lili;LEI Shenglan;GAO Zhongliang;HAN Xiao;YU Sa(Research Institute,Shenzhen Branch of China National Offshore Oil Corporation Limited,Shenzhen 518054,China)
出处
《石油科学通报》
2022年第3期309-320,共12页
Petroleum Science Bulletin
基金
中海石油有限公司“十三五”科技重点项目“南海东部油田上产2000万吨关键技术研究”(CNOOC-KJ 135 ZDXM 37 SZ 01 SHENHAI)资助。
关键词
陆架边缘三角洲
储层特征
物性
主控因素
珠海组
白云南洼
shelf margin delta
physical properties
prediction of favorable reservoirs
Zhuhai Formation
southern subsag of the Baiyun sag
