用覆压岩心渗透率优化测井渗透率计算模型

Optimization of logging permeability calculation model using overburden pressure core permeability

陈俊¹ 沙里锞¹ 王新海¹ 袁少阳² 刘春雷³ 刘波涛⁴

中国石油大学（北京）石油工程学院，北京 102249 长江大学地球物理与石油资源学院，湖北 武汉 430100 中国石油集团测井有限公司油气评价中心，陕西 西安 710077 长江大学计算机科学学院，湖北 荆州 434023

College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China Geophysics and Oil Resource Institute, Yangtze University, Wuhan 430100, China Oil and Gas Evaluation Center, Logging Company Ltd., CNPC, Xi′an 710077, China School of Computer Science, Yangtze University, Jingzhou 434023, China

渗透率是确定储层产能的关键指标之一，其准确性关系到储层产能评价的准确程度。测井数据相对试井资料更加丰富、成本低，可以有效获得井筒附近地带各小层的静态特征，为小层的产能评价提供参数支持。为了使测井渗透率的计算更为精确，以吉木萨尔致密油地区为例，在前人研究基础上，通过分析对比覆压孔渗实验数据，发现渗透率和有效覆压的无因次乘幂关系比一般认为的指数关系要好。用无因次乘幂关系模型预测地层真实岩心渗透率，进而来拟合测井参数与孔隙度、渗透率的关系，以达到优化测井渗透率计算模型的目的。该方法在吉木萨尔致密油地区的应用效果良好，比直接用地面岩心实验值的计算结果更为接近实际值。

Permeability is one of the key indexes to determine the capacity of the reservoir, and its accuracy is related to the accuracy of reservoir productivity evaluation. Compared with well testing data, logging data are more abundant with low cost, from which the static characteristics of the small layers near the wellbore zone can be effectively obtained to provide parameter support for the small layer capacity evaluation. In order to calculate logging permeability more accurately, taking the tight oil in Jimusar Area as an example, on the basis of previous studies and comparison of the overburden pressure porosity-permeability experimental data, the author found the dimensionless power relationship between permeability and overburden pressure is better than the generally assumed exponential relationship; the dimensionless power relationship model is used to forecast the real layer core permeability and fit the relationship of logging parameters with porosity and permeability to optimize the calculation model of logging permeability. The calculation results of the tight oil in Jimusar Region using this method shows good effect, which are closer to the actual values than that using the experimental value of the ground core directly.

10.6056/dkyqt201602012