摘要
溶孔洞型含气碳酸盐岩储层岩性变化多样,岩石骨架参数难以确定;孔隙空间分布非均质性较强,声波传播规律与常规碎屑岩中的不同;且储层含气对中子、密度测井有明显影响,导致了孔隙度评价困难。在岩性识别、求准岩石骨架参数的基础上,提出了声波相对时差-孔隙度对数模型来计算孔隙度的方法。实际资料处理结果表明,利用该方法计算的孔隙度与岩心分析孔隙度结果符合较好,能够满足储层孔隙度评价精度要求。
Lithologic variations were induced in porous and vugg gas carbonate reservoirs,it was difficult to determine the parameters of rock matrix.The distribution of pores and vugs is highly heterogeneous,the rules of sonic wave propagating in the conventional clastic rocks were different from that of in carbonate rock.In addition,bearing gas had a remarkable effect on logging response,thus its pore spatial distribution was with strong heterogeneity,sonic transmission rules were different with those of clastic rocks,gas containing in the reservoirs had evident influence on neutron and density loggings therefore it was very difficult for porosity evaluation.A sonic-transit-time versus porosity logarithmic model was put forward to calculate the porosity of reservoir based on distinguishing lithology and calculating parameters of rock matrix.The result of data processing shows that the porosity calculated by using this method is consistent with of core porosity,it can meet the accuracy in reservoir calculation.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2011年第6期92-97,8,共6页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2008ZX05005)
关键词
碳酸盐岩
孔隙度
声波时差
气层
carbonate
porosity
sonic-transit-time
gas reservoir
