南堡凹陷碳酸盐岩储集性能测井评价研究

On Log Data Evaluation of Carbonate Reservoir Property in Nanpu Sag

针对南堡凹陷潜山碳酸盐岩勘探开发需求,基于基质孔隙和裂缝发育情况进行储集类型识别。利用横波和斯通利波测井资料分析储层有效性,快慢横波最大最小正交能量差较大时,斯通利波出现"Ⅴ"字型干涉条纹,反射特征明显。基于总孔隙度、裂缝孔隙度、流体移动指数等测井成果信息构建综合判别指标,经自然产能刻度后实现对储集性能的定量评价,初步形成了碳酸盐岩储集性能测井评价方法和标准。将南堡凹陷碳酸盐岩储层划分为3个等级,其中米日产液量≥1 t的为优质储层。实际应用表明,自然产能预测和储集性能评价成果与生产结果基本吻合。

In view of the exploratory development needs of carbonate reservoir in Nanpu sag, put forward is reservoir type identification based on matrix porosity and fracture development degree. Analyzed is the reservoir effectiveness by use of transverse wave and Stoneley wave log data. It is believed that transverse wave and Stoneley wave show good consistency in indicating reservoir effectiveness. That is to say, Stoneley wave shows distinct reflection features with ＂V＂ shape interference fringe, when maximum and minimum orthogonal energy difference between fast and slow S-wave components is comparatively larger. Built are the comprehensive discrimination indices for reservoir property according to total porosity, fracture porosity, fluid movement index, etc. Thereby, Quantitative evaluation of reservoir property is realized after calibration of natural productivity, and consequently, formed is a preliminary log evaluation method and criterion for the reservoir property. Carbonate reservoir in Nanpu sag is divided into 3 grades, and the reservoir with liquid yield over 1 t/d per meter is higher quality reservoir. Practical application indicates that capacity prediction and reservoir property evaluation result is coincidence with the yield.