基于成像测井资料单井沉积相解释

摘要

由于成像测井具有极高的纵向和横向分辨率，则可利用其图像所反映的信息进行沉积相识别。利用岩心资料对成像测井图像进行标定，并基于成像测井资料和常规测井资料对研究区岩性及层理进行分析和识别，从而进行沉积相解释。通过对沉积相的分析，可将研究区分为曲流河道、泛滥平原、河漫滩沉积和天然堤4个微相。对比常规测井资料识别沉积相方法，成像测井资料解释沉积相方法更简单准确。在沉积相的分析中，根据该地区的常规测井数据，用交会图法对沉积相进行分析验证。在交会图中，相同的沉积相在交会图上表现为相同的特征分布，成像测井资料结合岩心资料可准确识别沉积相。%The imaging logging has a very high rate of vertical and horizontal resolution,so we can use the information reflected by the image to analyze the sedimentary facies.The emergence of imaging logging technology,makes the logging data in the applications of for⁃mation evaluation and analysis of sedimentary facies has been further extended,electric imaging technology will appear in the form of"Pseudo core" image in front of people,so we can use the information reflected by the image to analyze the sedimentary facies,and then improve the precision of the analysis and resolution of the geological target.And because the imaging logging has a very high rate of ver⁃tical and horizontal resolution,the sedimentary characteristics,including various sedimentary structure,sedimentary rhythm,top and bot⁃tom rock interface contact relationship can be intuitively and clearly observed on the image.Through the image recognition of rock sedi⁃mentary rhythm and sedimentary structure,such as horizontal bedding,parallel bedding,cross bedding,scour surface,biological agitation and deformation structure,we can analyze and recognize the sedimentary microfacies,and then judge the sedimentary facies.FMI(forma⁃tion micro⁃resistivity imager)log technology provides a clear and intuitionistic image of stratum around borehole wall.The core data and conventional logging data are usually used to calibrate the FMI image for sedimentary facies identification which can improve the relia⁃bility of the analyzed result.