渤海湾盆地胜坨油田二区储层微观渗流场演化研究

STUDY ON THE EVOLUTION OF THE MICROVADOSE FIELD IN THE RESERVOIRS OF THE SECOND DISTRICT OF SHENGTUO OILFIELD

徐守余

Xu Shou-yu

中国地质大学, 地球科学与资源学院, 北京, 100083 2. 石油大学, 地球资源与信息学院, 山东, 东营, 257061

School of Earth Sciences and Resources, China University of Geology, Beijing 100083, China 2. School of Earth Resources and Information, Petroleum University, Dongying, Shandong 257061, China

该文以长期注水开发的胜坨油田二区沙二段储层为例,应用岩心分析及实验室渗流物理模拟的数据,从岩石的润湿性、孔隙结构和相对渗透率等3方面的变化,研究长期注水开发储层的微观渗流场演化规律。研究认为,随注水开发程度加深,储层岩石润湿性、亲水性逐步增强;储层孔隙结构的演化趋势是孔隙均匀程度变好、喉道均质程度增高和孔喉连通性及控制流体流动能力变好;束缚水饱和度呈上升趋势,残余油中水相相对渗透率呈下降趋势,但变化不大。储层渗流场的演化控制和影响着储层中剩余油的数量及空间分布。

Taking the reservoirs of the Sha-2 Member in the second district of Shengtuo oilfield long-term developed by waterflood as an example and using the data of core analysis and physical vadose simulation in laboratory, the evolutionary rules of the microvadose field in the reservoirs long-term developed by waterflood were studied from the changes of rock wettability, pore structure and relative permeability three respects. It was considered that the rock wettability and hydrophicity in reservoirs got enhanced with the degree of waterflood development increasing. The pore structure of reservoirs had the evolutionary trend that pore uniformity degree, throat isotropic degree, pore-throat connectivity and the ability to control fluid flow got better. The saturability of bound water tended to rising, and the relative permeability of water phase in residual oil tended to descending; but the shanges were not great. The evolution of the vadose field in reservoirs controlled and affected the amount and space distribution of residual oil in reservoirs.

国家"973"科技攻关项目(G1999022509).

https://doi.org/10.11781/sysydz200304381