摘要
针对松辽盆地青山口组一段页岩油藏19块岩样,开展高速离心和核磁共振实验,建立储层可动油评价方法,揭示目标页岩油藏可动油特征;结合高压压汞实验和扫描电镜实验,从孔隙结构角度分析目标油藏可动油特征的原因。结果表明:随着渗透率降低,实验岩心T 2谱右峰比例减少,可动油变少。区块一岩心可动油百分数平均17.88%,区块二岩心可动油百分数平均14.56%;不同渗透率岩心均含有一定量微米级渗流通道,两区块岩心中微米喉/缝控制的可动油分别为9.34%和5.7%;0.10~1.0μm喉道控制的可动油比例较低,区块一平均为4.05%,区块二平均为3.22%;小于0.1μm喉道控制的可动油比例区块一为4.49%,区块二为5.64%。区块一大于1.0μm喉道控制的可动油比区块二更高,区块二小于0.1μm喉道控制的可动油比例较高。高压压汞表明,目标页岩油储层有一定比例较大喉道发育,但基质喉道总体非常小,主要喉道分布在5~30 nm,6块岩心平均喉道半径为30 nm,储层喉道分布和可动油分布有很好的一致性,喉道分布特征决定了可动油的分布特征。扫描电镜结果表明:目标页岩油藏基质致密、喉道小,多数孔隙呈孤立状,部分储层发育裂缝隙、间裂缝等微裂缝,非均质性强;储层发育一定比例微裂缝,因此离心力较小时能驱出一定量的原油,但储层基质整体致密,喉道小,导致其总可动油比例较低。
A total of 19 rock samples from the Qingshankou Formation shale oil reservoir in the Songliao Basin were subjected to high-speed centrifugation and nuclear magnetic resonance experiments.A reservoir movable oil evaluation method was established,revealing the characteristics of movable oil in the target shale oil reservoir.Combining high-pressure mercury injection experiments and scanning electron microscope experiments,the reasons for the characteristics of movable oil in the target reservoir were analyzed from the perspective of pore structure.The results show that as the permeability decreases,the proportion of the right peak in the T 2 spectrum of the experimental core decreases,and the movable oil decreases.The average percentage of movable oil in block 1 core is 17.88%,and in block 2 core is 14.56%.Both cores with different permeabilities contain a certain amount of micrometer-scale flow channels.The movable oil controlled by micrometer-scale throats/fissures in the two blocks is 9.34%and 5.7%,respectively.The proportion of movable oil controlled by 0.10~1.0μm throats is relatively low,averaging 4.05%in block 1 and 3.22%in block 2.The proportion of movable oil controlled by throats smaller than 0.1μm is 4.49%in block 1 and 5.64%in block 2.The proportion of movable oil controlled by throats larger than 1.0μm is higher in block 1 than in block 2,while the proportion of movable oil controlled by throats smaller than 0.1μm is higher in block 2.High-pressure mercury injection indicates that the target shale oil reservoir has a certain proportion of larger throats development,but the overall matrix throats are very small,with the main throats distributed between 5~30 nm.The average throat radius of the six cores is 30 nm,and the distribution of reservoir throats is in good agreement with the distribution of movable oil.The throat distribution characteristics determine the distribution characteristics of movable oil.Scanning electron microscope results indicate that the target shale oil reservoir has a dense ma
作者
黄千慧
李海波
邢济麟
杨正明
薛伟
姚兰兰
杜猛
孟焕
HUANG Qian-hui;LI Hai-bo;XING Ji-lin;YANG Zheng-ming;XUE Wei;YAO Lan-lan;DU Meng;MENG Huan(College of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Porous Flow and Fluid Mechanics,Langfang 065007,China;China Petroleum Exploration and Development Research Institute,Beijing 100083,China;Exploration and Development Research Institute of Jilin Oilfield Company PetroChina Co.,Ltd.,Songyuan 138000,China)
出处
《科学技术与工程》
北大核心
2024年第12期4942-4951,共10页
Science Technology and Engineering
基金
中石油重大专项(2022kt1001,2021DJ2202,2021DJ1804)
中石油CCUS重大专项(2021ZZ01-03)
长庆油田项目(技2021-117)。
关键词
页岩油藏
高速离心
核磁共振
高压压汞
shale oil reservoir
high-speed centrifugation
nuclear magnetic resonance
high-pressure mercury injection
