缝洞性碳酸盐岩储层酸压效果影响因素研究

FACTORS OF AFFECTING THE ACID FRACTURING EFFECT IN FRACTURE-CAVITY CARBONATE RESERVOIR

塔里木碳酸盐岩储层表现为缝洞性、非均质性强等特点,对酸压改造效果带来诸多不确定因素。统计选出哈拉哈塘油田酸压效果的九项影响因素,对影响因素采用灰色关联法从定量上分析出主次排序。研究结果表明,与酸压效果关联度最大的前四项因素依次是裂缝密度、储层级别、自然伽马和深浅侧向电阻率比,而用酸强度、施工排量和孔隙度等与酸压效果关联度较弱。

Carbonate rock reservoirs in Tarim Oilfield are characterized by fracture-cavity and strong heterogeneity, which bring many uncertain factors to acid fracturing effect. Nine factors affecting acid fracturing effect were selected from many factors in Tarim Halahat oilfield, and the importance ordering of nine factors was analyzed quantitatively by using grey relative analysis method. The results showed that the four factors(on order: fracture density, reservoir level, GR, LLD/LLS) were high relevance with acid fracturing effect. However, the acid intensity, delivery rate and reservoir porosity were low relevance with acid fracturing effect.