Logging Data Environment Correction Technology Research And Applications

In order to solve the difficult problems of which occurred within the well log interpretation in the area of south edge of Junngar Basin, and serve for the oil and gas exploration; this paper, however, based on the log materials and associated with materials of geology, engineering, experimental analysis, to probe reasonable and scientific explanation methods and computation models, recover the real log information of formations with best performance, and improve the coincidence ratio of log interpretation. Allowing for these aspects, and then the technical study on environmental adjustment for the electrical resistivity and porosity materials has been conducted; moreover, the software for pretreataient and environmental adjustment of the log information have been developed; especially, the latter will be a base of that can accurately evaluate the log materials with comprehensive way by recovering the real log information with best performance.Concerning the geologic characteristics of formations and materials situation of resistivty log, the analysis for invasion influence and the two-dimension inversion of resistivity log have been considered to solve the influence problems of resisitivty log caused by its response to the mud invasion and surround rocks, which will provide a way to obtain the accurate resisvity log by the way of completed pretreatments of resisitivity log (such as environmental adjustments).Furthermore, these techniques have been proved reasonable and advanced when they applied to the south edge of Junngar Basin. The true resistivity of formations computed precisely by using of the inversion technique, the interactive processing technique can be applied to structural explanation of formations, analysis for stability of wellbore, prediction of the breaking stress of formations and the deliverability, and the judgment of stress direction of formations. The results will be a strong technical supports for the future exploration of oil and gas in the area of south edge of Junngar Basin. For example, the industrial oil and gas currents cheerfully exploited from Well An 5 which had been treated as one of the most important achievements, it can not be separated from that the log materials truly recovered the strata information.