有效储层物性下限值的确定方法

有效储层是指饱含油气并且具有油气储产能力的储层。有效储层的物性下限位主要包括储层孔隙度、渗透率和含油饱和度下限值。通常认为,当有效孔隙度、渗透率、原始含油、气饱和度达到一定界限时,储层才具开采价值,此界限即为储层的物性下限。通过对有效储层物性下限值影响因素的分析,认为有效储层物性下限值的确定,应使用多种方法从多个方面反映各因素的影响,避免因研究方法单一而在对下限标准取值时可能产生的较大偏差。另外,不同地质条件下的物性下限标准有差别,甚至差别较大,应根据各油田地质特征研究相应的物性下限标准。

Determination Methods of the Petrophysical Lower Limit Value for the Effective Reservoir

Effective reservoirs can be defined as ones which contain oil and gas and also can store and produce them.The petrophysical lower limit values of an effective reservoir includes porosity,permeability and oil saturation.It is commonly thought that when the effective porosity, permeability,original oil or gas saturation reach to a certain limit,the reservoir has exploitation value.This limit is the petrophsical lower limit of the reservoir.Through analysis of influencing factors to the lower limit values,it is thought that multiple methods should be used to determine the lower limit values which can reduce errors eauacd by only one method and get real values.In addition,the lower limit stan- dards vary in different geological conditions and even vary much.Therefore,they should be studied according to the geologic characeristics in each oilfield.