Research Into Correction Method And Inverse System Of Premagnetic Curve

With the deepeness of oil field digitization, the vectoration of premagnetic curve is expanding gradually. But during the inversing, the curve is found to shift up or down, which exposes that the precision and reliability of vectorial curve data are not high enough. So these data can not be applied in Daqing oil field, and original drawing measure methods are still adopted in construction process.Aiming at detailed error situation caused by saving and scanning the premagnetic curve drawing paper, based on analysis of the characteristic of these papers, correction method is introduced and an inverse system is reasearched in this thesis. In this system, background grid is extracted first, then the curve data are corrected according to the grid, and the corrected data are stored into warehouse. Finally, an inverse system based on B/S strcture is constructed.The work in this thesis includes the following topics:1. A background grid extraction method based on cross neighborhood is advanced;2. The reasons caused error are synthetically analyzed;3. Aiming at the characteristic of each error, corresponding correct method to background grid extrction is proposed;4. Based on analysis of LA716 file format, which saved vector data and the new curve data, a converted store system of premagnetic curve is setted up;5. An inverse system based on B/S structure is constructed.A relatively holistic system is accomplished in this thesis, and massive corrected data are inversed with this system. According to compared with original drawing, it verifies that the curve depth error is controlled within 0.01m after corrction, and the precision and reliability of vectorial curve data are improved greatly, which establishes a solid foundation for the application of these data in oil field.