三介质模型常规测井变尺度极差分析裂缝预测技术

Fracture prediction using rescaled range analysis and based on conventional logging data of triple media model

陈义国 张丽霞 赵谦平 史鹏 杨超

陕西延长石油（集团）有限责任公司研究院，陕西 西安 710075

Research Institute of Shannxi Yanchang Petroleum (Group) Co. Ltd., Xi′an 710075, China

油气储层裂缝分布预测对工区储层开发、注水及剩余油分布特征研究等均具有重要意义。未进行大量取心、成像测井的工区，常规测井资料是进行井中裂缝识别及预测的重要手段。裂缝性地层测井响应受基质岩性、基质孔隙所含流体、裂缝孔隙所含流体3种介质的共同影响。现有变尺度极差分析主要是对声波时差、自然伽马测井数据进行处理，难以区分基质孔隙变化及裂缝对测井响应的影响，对高角度裂缝识别也存在一定困难。文中基于三介质模型，对自然伽马、声波时差及浅侧向电阻率进行变尺度极差分析，反演出地层垂向岩性、基质孔隙、电性变化特征，提取裂缝分布指示信息，并与工区成像资料进行对比，取得了较好的识别及预测效果，能很好地应用到工区裂缝研究中。

Fracture distribution prediction of reservoir is important to reservoir development, water injection and distribution characteristics study of residual oil. Conventional logging data is the important means to identify fracture in well when there is not enough coring and imaging data. The log response of fractured formation is affected by the matrix lithology, the fluid contained in matrix pore and the fluid contained in fractured pore. Existing rescaled range analysis mainly concentrates on AC and GR data processing, having difficulty in distinguishing the effect of fracture and matrix pore variety on the log response and discriminating of high angle fracture. In order to overcome its shortcomings, this paper analyzes the AC, GR and LLS data and presents an improved method inversing the lithology, matrix pore and electronic features based on triple media model, which compares with acoustic imaging data, getting a perfect discriminated result that can been applied in fracture study of work area.

10.6056/dkyqt201201019