测井技术2017，Vol.41Issue(2)：165-170,6.DOI:10.16489/j.issn.1004-1338.2017.02.007
东营凹陷低渗透砂岩油藏地层水电阻率对饱和度计算的影响
Effect of Formation Water Resistivity of Low Permeability Sandstone Reservoir in Dongying Sag on Oil Saturation Interpretation
摘要
Abstract
Formation water resistivity (Rw) is a key parameter for oil saturation interpretation based on Archie equation.There are two methods to get this parameter,the standard water layer data back calculation or formation water analyzation.The water layer and oil layer Rw are always considered equally.But for Dongying Sag south slope of ES3 and ES4 low-permeability sandstone reservoirs,if making the oil layer and water layer Rw equal,there often appear same contradictions in the process of practical application.When using the Rw which is calculated by analyzing data of water in oil layer,the standard water layer Sw is less than 80%.But if the Rw was calculated by analyzing data of water in standard water layer,the Sw of oil layer is on the high side.It shows that even in the same oil-water system,the Rw of oil and water layer can be different.Firstly from Archie equation and the practical log data,we found that the Rw of oil reservoir is less than water layer.And then,by analyzing the reason from the angle of accumulation found that,after hydrocarbon accumulation the water of oil reservoir is mainly high salinity which is accumulated with hydrocarbon and saved in micro pores.This kind of water content is low and isolated from water layer and adjacent formations,so it is difficult to diffuse or exchange.Therefore,the water has the characteristics of high salinity.In the water layer,the formation water keeps low salinity,and the water salinity will reduce as time goes.So,these reasons lead to the different water salinities in oil and water layer.This knowledge has a significance to improve the accuracy of low permeability sandstone reservoir saturation and calculation of reserves.关键词
测井解释/饱和度/Archie公式/地层水电阻率/矿化度/东营凹陷Key words
log interpretation/saturation/Archie equation/formation water resistivity/salinity bian/Dongying Sag分类
天文与地球科学引用本文复制引用
耿斌,蔡进功,闫建平,王端平,王敏,周德志,梁强..东营凹陷低渗透砂岩油藏地层水电阻率对饱和度计算的影响[J].测井技术,2017,41(2):165-170,6.基金项目
国家自然科学基金(41372130,41202110) （41372130,41202110）
国家油气重大专项(2016ZX05006-001-003) （2016ZX05006-001-003）
