测井资料在油页岩评价中的应用——以鄂尔多斯盆地HJF地区为例

Application of Logging Data in the Evaluation of Oil Shale——The Example from the HJF Area of Ordos Basin

目前在实际工作中油页岩含油率的测定主要是通过油页岩岩样的实验室测定来获取。但由于成本高、轻烃组分挥发、有机质含量纵向非均质性等因素的影响,造成实验室测得的数据有限且不能反映真实的地层情况。通过对鄂尔多斯盆地何家坊地区油页岩详细研究,发现该区声波时差、密度、自然伽马、电阻率等测井曲线在油页岩岩段均有异常反应,且该异常反应同油页岩含油率的变化具有明显的对应关系。在该对应关系的基础上,利用△logR法建立了适用于该区的计算公式,并运用计算公式对研究区探井进行评价。评价发现,计算所得油页岩含油率数据同实验室测定结果相吻合。

At present,in practical work the shale oil content is mainly obtained from measurement of the samples under laboratory conditions.However,owing to the influences of high economic costs,evaporation of light-hydrocarbon components,and heterogeneity of the organic content in longitudinal distribution,the laboratory data are limited and cannot reflect the real condition of the stratum.After detailed research of the HJF Area in Ordos Basin,it is found out that such logging data as interval transit time,density and natural gamma ray take on an abnormal reaction to the oil shale area and this reaction has an obvious corresponding relation with the change of shale oil content.On this basis,it employs theΔlogR technology and the multiple regression equation method to establish empirical formula which can be applied to this area for measuring shale oil content by longing data and evaluates oil shale by this formula.After evaluation it turned out that the calculated data of oil shale effective thickness and shale oil content are equal to the geological logging data and the laboratory data.