吐哈盆地吐玉克油田油层测井解释方法研究

Logging Interpretation Study of Oil Reservoir in Tuyuke Oilfield,Tuha Basin

吐玉克油田为一块状底水稠油油田,含油性与物性关系明显;油层电阻率与孔隙度呈正相关关系。通过对储层的岩石物理特征研究,建立了稠油层物性与含油性关系以及物性、含油性与电性之间的关系;基于剖面岩性复杂的特点,分别利用声波、密度测井分段开展了以孔隙度模型为主的储层参数建模;以孔隙度15×10-3μm2和渗透率17.5%关系为拐点和试油约束的中子-密度交会方法,建立了油层分类标准;岩心分析岩石物性数据和测井计算孔隙度、渗透率结果对比表明,储层参数模型精度可以满足生产的需要。现场应用结果表明,研究成果解释精度高,地效果显著。

Tuyuke Oilfield is an oilfield bearing heavy oil with massive bottom water. For its efficient development, it is very important to accurately identify fluid characteristic and classify oil layers. Through petrophysics research of the heavy oil reservoirs, correlation graphs of water saturation to porosity, and resistivity to porosity are presented. By calibrating logging data with core analysis data, established are fitting equations of compensated neutron log to shale content or median grain diameter, acoustic slowness or compensated density log to porosity （since compli- cated lithology, the fitting is separately done in different porosity ranges）, and permeability to porosity. The Archie＇s parameters for calculating water saturation are obtained form core experiments. Constrained by results of well test, criterions of oil layer classification are established on crossplots of neutron-density and porosity-permeability. Case studies are presented.