南八仙油气田测井储集层参数与油气识别方法研究

A study on the identification of reservoir parameters and oil/gas beds in Nanbaxian oil field.

“岩心刻度测井”技术是在获得地质、取心、测试等资料的基础上 ,进行精细测井解释较普遍采用的方法 ,以此为指导思想 ,由南八仙油气田实际资料分析入手 ,通过确定岩性、物性与电性之间的最佳转换关系 ,逐步建立了第三系砂岩储集层的泥质含量、粒度均值、孔隙度、渗透率、含油 (气 )饱和度等储集层参数解释模型 ,其中针对储集层含气时对测井响应的影响 ,分别建立了油气层与水层的孔隙度模型。在测井储集层参数研究基础上 ,与试油气结论相结合制作了油 (气 )、水层识别图版。并依据气层在三孔隙度曲线上存在的特殊的响应特征 ,探讨空间模量差比法、双中子孔隙度差值法等直观识别气层方法与常规方法的验证关系。通过南八仙油气田 8口井资料的实际处理解释 ,取得了较好的效果 ,与试油气资料对比符合率达 85 % ,证实其可做为南八仙油气层识别的有效方法。

A technique called “Core Calibration Log” is used popularly to interpret well logging data in Nanbaxian oil field which is upon the basis of a combination of geologic, core and well testing data. By using the actual data of Nanbaxian oil field, optimized inter-relationship of stratigraphy, petrophysical properties vs. electrical properties are determined and interpretation models of various reservoir parameters, such as shale content, mean grain size, porosity, permeability, oil (gas) saturation etc. are established. Porosity models of oil (gas) beds and the water beds (aquifers) are established respectively according to the effects of logging response when they are gas containing. Based upon a study of reservoir parameters determined by log interpretation combined with the results of well testing charts for the identification of oil (gas) beds are established. Results of methods to identify gas beds intentionally such as space modulus difference ratio method, double neutron porosity difference method and these conventional method are discussed based upon the special response characteristics of the 3-porosity curves of gas beds. Actual interpretation of the well logging data from 8 wells in Nanbaxian oil field give rather good results, and conform with well testing data at a rate of 85%. This technique will be an effective method for identification of oil (gas) beds is thus verified.