关键词: 储层敏感性, 自然伽马能谱测井, 地层伤害, 粘土矿物, 泥质含量

Abstract: It is a new subject to determine reservoir sensitivity by well logging.Based on the collected data from the thin slice observation, cast slice observation, granularity analysis, mercury injection, micro scanning, porosity and permeability analysis, X-ray diffraction, core fluid sensitivity tests ect., this paper deals with the determination of reservoir sensitivity by well logging for the first time.14 parameters such as quarts, feldspar, clay volume, montmorillonite, kaolinite, illite, chlorite, medium granularity value, formation water salinity, composite poro-perm parameter, porosity, permeability, medium capillary radius value have been obtained by well logging information.The relations between logging data and reservoir sensitivity factors have been established for the studied oilfield and the results are also obtained by using these models.Based on the analysis of reservoir sensitivity and its factors, a new theoretical table is put forward, and a new single variable regression coefficient weighted method is also put forward at the same time, which are used to predict reservoir sensitivity by logging datd.The logging processing results show that the fluid velocity sensitivity, fresh water sensitivity, salt water sensitivity, acid sensitivity, and alkali sensitivity are consistent with the results of the core fluid sensitivity test of the studied area, which is of importance to mud content design, finding of commercial oil and gas layers and reservoir protection.

Key words: reservoir sensitivity, natural Gamma Ray spectrometry logging, formation damage, clay mineral, clay volume