摘要
Abstract
In order to clarify the impact of bitumen on the properties of the reservoir,this paper takes the 11 well area of Silurian in central Tarim basin as an example to analyze the effects of bitumen on reservoir physical properties,pore structure,and electrical properties.In addition, the changes in T2spectrum obtained by NMR experiments under different centrifugal force conditions were also analyzed to optimize the T2cutoff.All of these analyses are based on experimental results from bituminous sandstone before and after washing oil,washing salt,and washing asphalt.It is found the porosity measured after washing oil and salt is bigger than the porosity after washing asphalt,which indicates that the content of heavy oil in pore space is higher than that of dry asphalt.Since the dry asphalt is mainly distributed in large pore throats, the pore structure after asphalt washing becomes better;moreover,the dry asphalt will increase the resistivity of the middle and low permeability reservoirs,but after washing asphalt,the conductivity of the rock samples become better.According to the results of NM R experiments,it is suggested to use varying T2cut-off in actual NM R data processing to determine the volume of the movable fluid volume and the bound fluid volume.In order to accurately calculate the content of bitumen,the volume occupied by the oily gum bitumen in the interparticle pores should be taken into consideration when constructing the model,which will help to identify the fluid prop-erties.关键词
测井评价/沥青砂岩/志留系/储层物性/孔隙结构/稠油Key words
logging evaluation/bituminous sandstone/Silurian/reservoir physical properties/pore structure/Heavy-oil分类
天文与地球科学
