摘要
三水盆地布二段是主要的烃源岩发育层段,以“源内找油”的思路开展了该层系夹层型页岩油研究,剖析了沉积背景、烃源岩特征、储层特征等成藏因素,总结了夹层型页岩油“甜点”基本特征。结果表明,该盆地东部斜坡在贫物源背景下发育泥岩灰岩间互沉积,泥质烃源岩源内夹层型灰岩储层大面积、叠置连片分布;烃源岩广覆式分布于整个盆地,TOC一般介于0.8%~1.8%,TOC高值区与东部斜坡较为匹配,具备较好的页岩油烃源岩基础;碳酸盐储层岩性以泥灰岩、灰泥灰岩为主,以“泥岩层系内薄夹层”的形式叠置连片发育;储集空间以裂缝、晶间孔为主,油气显示活跃,形成连续分布的夹层型页岩油;“基质孔-裂缝”组成的孔缝网络既是储集空间又是源储输导体系,利于油气富集形成储集甜点,储集甜点段具有“灰岩集中,物性较好、脆性好、含油性好”的特征,改变了对布二段薄层、致密灰岩“成藏条件差”的固有认识。
Bu 2 member of Sanshui basin is the main hydrocarbon source rock development section of the basin.Based on the idea of"into the source to find oil",the intercalated shale oil of this series is studied.The reservoir forming factors such as sedimentary background,source rock characteristics and reservoir characteristics are analyzed,and the basic characteristics of sandwich shale oil"sweet spots"are summarized.The results show that mudstone-limestone interbedding is developed in the eastern slope of the basin under the background of poor material source,and the intercalated limestone reservoir in the argillaceous source rock is distributed in a large area and overlapped.Source rocks are widely distributed in the whole basin,and the TOC is generally between 0.8%~1.8%.The high TOC value area matches the eastern slope,and has a good shale oil source rock foundation.The lithology of carbonate reservoir is mainly of marlstone and calcareous marlstone,which is overlapped and developed in the form of"thin interlayer in mudstone series".The reservoir space is dominated by fractures and intergranular pores,with active oil and gas display,forming a continuously distributed interlayer shale oil.The pore-fracture network composed of"matrix pore-fracture"is not only a reservoir space,but also a source reservoir transport system,which is favorable for hydrocarbon accumulation and forming reservoir sweet spots.The section of the reservoir sweet spots has the characteristics of"concentrated limestone,good physical,brittleness and good oil-bearing properties",which changes the understanding of"poor reservoir forming conditions"of thin and tight calcareous rocks in Bu 2 member.
作者
唐鑫萍
许泓
曹宇畅
林火养
李敏
曾济楚
TANG Xinping;XU Hong;CAO Yuchang;LIN Huoyang;LI Min;ZENG Jichu(Dagang Oilfield Company,PetroChina,Tianjin 300280,China;Nanfang Petroleum Exploration&Development Co.,Ltd.,PetroChina,Haikou,Hainan 570216,China;Beijing Well Logging Technology Development Company of CNPC Logging Co.,Ltd.,Beijing 102206,China)
出处
《石油地质与工程》
CAS
2022年第2期48-53,共6页
Petroleum Geology and Engineering
基金
国家重大科技专项“大型油气田及煤层气开发”子课题(2016ZX05026003)
中国石油天然气集团科技专项“成熟探区精细勘探关键技术”(2019D-0707)联合资助。
关键词
三水盆地
夹层型页岩油
沉积背景
源储配置关系
页岩油甜点
Sanshui basin
interbedded shale oil
sedimentary setting
source storage configuration relationship
shale oil sweet spots
