利用等时速率法评价火山岩储层特征

Primary Exploration of Evaluating Volcanic Rock Reservoir Feature by Equitime Rate Method

火山岩储层受低孔渗、非均质性、导流导压能力弱、储层污染及井储效应等影响,资料获取率和合格率低,大量续流资料无法用于储层评价。通过对大量现场测试资料进行统计分析,找出了储层特征的变化与储层压力恢复速率变化间的规律,提出了等时速率解释法并建立了等时速率模型,并验证了试井解释结果。应用结果表明,等时速率解释法可以较好地评价三塘湖盆地火山岩储层的非均质性及污染特征,完全适用于储层特征分析。

Volcanic rock reservoir is affected by low porosity,low permeability,heterogeneity,poor diversion capacity,reservoir pollution and well bore storage,and it leads to low data acquisition rate and qualification rate,a great deal of data after flow can not be used for reservoir evaluation.By means of statistical analysis for a great quantity of on-site testing data,it is found out regulation between reservoir feature changes and reservoir buildup pressure rate changes,in view of above equitime rate interpretation method and developing model,proving relationship among reservoir filtering flow,pollution feature and rate.Application result shows equitime rate interpretation method can be evaluated excellently aeolotropism and pollution feature of volcanic rock reservoir in Santanghu basin,and completely adapted to reservoir feature analysis.