摘要
对于复杂孔隙结构储层,传统的阿尔奇公式计算出的含油饱和度偏低,导致解释过程中漏失油层。阿尔奇公式中岩性系数a、胶结指数m和饱和度指数n受诸多因素影响,在使用时不应为一定值,而应随储层性质的变化而变化。利用××油田复杂孔隙结构储层14口井130块岩心岩电实验资料进行统计分析发现,岩性系数a与胶结指数m存在明显的幂函数关系。在单因素分析的基础上采用多元回归分析法建立饱和度指数的计算模型,修正了阿尔奇公式,建立了变岩电参数饱和度修正模型。实际资料处理表明,变岩电参数饱和度修正模型计算的解释误差比传统的阿尔奇公式提高10%以上,满足了储量计算误差要求,有效克服了传统的阿尔奇模型在复杂孔隙结构储层解释中的不适用性。
For complicated pore structures of reservoirs, the calculated oil saturation is lower by the traditional Archie formula, so some oil reservoirs have been missed. Recent studies show that the rock-elctric parameters a, rn and n in the Archie formula are effected by many factors, so there are not fixed values in application, but changed with the reservoir properties. Using 130 cores＇ rock electricity experiment data of 14 wells in ×× oilfield of sandstone reservoir with complicated pore structures to correct the Archie formula and establish variable rock-elctric parameters saturation correction model： There is a power function between factor a and cementation exponent rn, a quadratic function between rn and logarithm of porosity;When b= 1, using multiple regression analysis to establish the saturation exponent n computational model based on some correlation of saturation exponent n with porosity and pore structure parameters （the ratio of immovable and movable porosity, T2 geometric mean value）. Practical application indicates that variable rock-elctric parameters saturation correction model decreased the interpreted error by more than 10% as compared with the traditional Archie formula, which meets the reserve requirement calculation error and overcome the traditional model non-adaptive in reservoirs with complicated pore structures.
出处
《测井技术》
CAS
CSCD
2015年第1期43-47,共5页
Well Logging Technology
基金
中国石油天然气股份有限公司重大科技专项鄂尔多斯盆地致密油层测井识别与评价技术研究(2011E-2602)
关键词
测井解释
阿尔奇公式
饱和度模型
变岩电参数
孔隙结构
胶结指数
log interpretation
Archie formula
saturation model
variable rock-electric parame-ter
pore structure
cementation exponent
作者简介
作者简介：罗少成，男，1983年生，硕士，工程师，从事测井方法研究与解释评价工作。
