海上河流相储层沉积微相对微观水驱效果的影响研究

Influence of Sedimentary Microfacies on Relative Micro Water Drive Effect of Marine Fluvial Facies Reservoirs

为了解决海上河流相储层水驱开发面临的主要问题,从微观孔喉尺度,采用微观可视化实验,根据相同渗透率条件下不同沉积微相储层的孔喉结构特征、水驱油动态特征,研究沉积微相对微观水驱效果的影响。结果表明:研究区沉积微相微观驱替的主要影响因素为平均孔喉比和喉道半径,其中平均孔喉比相关系数平方为0.7855,喉道半径相关系数平方为0.8482。相同渗透率条件下,高渗时不同沉积微相平均孔喉比关系为:边滩<心滩<河道<辫状河道,水驱效率关系为边滩>心滩>河道>辫状河道;低渗时不同沉积微相平均孔喉比关系为:心滩<边滩<辫状河道<河道,水驱效率关系为心滩>边滩>辫状河道>河道。

In order to solve the main problems of waterflooding development of offshore fluvial reservoirs,the influence of sedimentary microfacies on the effect of microfacies on waterflooding was studied from the micro pore throat scale,using micro visualization experiments,according to the pore throat structure characteristics and water flooding dynamic characteristics of different sedimentary microfacies reservoirs under the same permeability conditions.The results showed that the main influencing factors of micro displacement of sedimentary microfacies in the study area were average pore throat ratio and throat radius,in which the correlation coefficient square of average pore throat ratio was 0.7855 and the correlation coefficient square of throat radius was 0.8482;Under the same permeability,for high permeability,the average pore throat ratio of different sedimentary microfacies was edge beach<core beach<channel<braided channel,and the water drive efficiency was edge beach>core beach>channel>braided channel;for low permeability,the average pore throat ratio of different sedimentary microfacies was core beach<edge beach<braided channel<channel,and the water drive efficiency was core beach>edge beach>braided channel>channel.