一种定量判别油藏流体连通性的新方法

将原油的气相色谱指纹图谱看作多维空间内的向量,尽量降低仪器的噪音门槛值以求取更多的色谱峰,然后利用向量夹角法计算2个色谱指纹图谱间的相似度。结果表明,在相同的仪器设备下,同一油样多次实验结果的相似度(或平均值)约为98%,这可作为油藏流体连通性的上限。将不同油藏的2个油样按不同比例进行配比,并计算配比油样与与原油样的相似度,其值随着配比比例的不同而发生规律性的变化,且均小于同一油藏油样的相似度。对同一油藏内的油样,求取相似度值(或平均值),并将其作为油藏流体连通性的下限值。相似度小于下限值时,油藏流体不连通;相似度大于下限值时,油藏流体可能连通。

A new method for quantitative identification of fluid continuity in reservoir

Considering chromatographic fingerprint of oil as vector of hyperspace and reducing the noise threshold value of instrument can get more chromatographic peaks.The comparability of two chromatographic fingerprint maps of different oil samples was calculated using the vector angle method.The result indicates that the comparability (or mean value) obtained from several experiments is about 98% under the same condition for the same sample.This value can be regarded as the upper limit for comparability of reservoir continuity.The oils from different reservoirs were mixed proportionally,and the comparability between the mixed oil and the single oil was calculated.The values of comparability vary regularly with change of proportions and are lower than the comparability of oil samples from the same reservoir.The comparability of samples from the same reservoir can be taken as the lower limit of reservoir continuity.When the comparability is lower than the value of lower limit,the reservoir fluid is considered as discontinuity whereas the reservoir fluid is possibly continuous.