低渗透油田油水层识别及油藏类型评价

Identification of oil water layers and evaluation of tight reservoir types

针对吉林英坨东地区低渗透油田特点 ,应用微差识图、无侵线等方法综合研究油水层识别问题。微差识图法根据电测曲线特征识别油水层 ,油层的深侧向 (或感应 )电阻率与声波时差均为高值 ,具有“反向”细微特征 ;水层对应电阻低值、声波时差高值 ,呈“同向”细微特征。无侵线法利用感应电阻率与 0 .5m电位电极的线性相关性 ,在二者构成的直角坐标系中 ,致密储集层的连线为无侵线 ,按小层内部的岩石与无侵线的关系区分油层或水层。认为英坨东油田主要属构造油藏 ,反向断层是主控因素 ,岩性因素对油气富集有重要影响。图 2参

To apply differential analysis and non invasion line in low permeability oil fields, this paper presents a method for identifying oil water in reservoirs. The resistivity and porosity logging curves are related, thus in the oil formation the deep laterlog (or induction) and acoustic logs are both in high value, showing the characteristic 'opposite direction.' While in the water formation the resistively log has a low value, and the acoustic log high value, showing the characteristic 'identical direction'. Since there is a linear relationship between the induction log value ( R i ) and 0.5 m potential electrode log value ( R i ) in the same coordinate system, the value of the induction log curve and 0.5m potential electrode log curve for the tight reservoir can make up a line, that is, the non invasion line. By comparing the Ri/Rn ratio ( R i , R n can be taken from any reservoir) to the non invasion line, it is possible to distinguish between oil and water layer. Analyzing the mechanism of reservoir formation, we demonstratd that antidip faulting is the main control factor of hydrocarbon aggregation; the lithology also had an important impact on hydrocarbon aggregation. As a main style in Jilin Tuodong oil field, structural reservoir should be a focussed target for oil field development in the future.