Well-to ERT Data Processing Of The Water Flooding, Inversion And Interpretation

Electrical prospecting is an important branch of applied geophysics,at the same time,electrical prospecting is also a branch of resilient, lot of species and applications.Electricalprospecting has been developed into a variety of methods,since the beginning of the20thcentury the concept of resistivity is apparently put forward.Electrical prospecting is according tothe different layers in the crust, rocks and minerals between the electromagnetic propertiesdifferences, through the observation of the existence of natural or set up by the artificial electricfield and the distribution of electromagnetic field, to study the geological structure, search foruseful mineral resources, engineering, environmental problems, such as solving a class ofgeophysical prospecting methods. Well electrical method is one of the methods of more mature,more widely used monitoring field of hydraulic fracturing fracture azimuth.Well ground resistivity method is combination with electric logging method and the surfaceof the direct current method.Well to the basic principle of electrical method refers to the powersupply in the well, through the development of well casing to underground into the powerfulcurrent,in the process of power measurement in the earth’s surface by the casing into theformation of the "leakage" in non-uniform electric property changes of underground mediumformed in the surface potential distribution, thus to reflect the features of the resistivity ofunderground medium.Well to electrical method has lower cost, simpler operation, moreconvenient, easier source and realization, not easy to damage the advantages of the wellconditions and not affect the production, so in this paper, study based on the positive inversionof resistivity method and the data processing of water drive front.Well ground resistivity forward numerical simulation to electrical method is well applied inmonitoring of water drive front theory, the numerical simulation of resistivity inversion is for agiven model and the calculated value is to reflect the resistivity distribution of undergroundmedium.With the theoretical research and practical application, the appearance of many newproblems to be solved and further perfect, these problems involve the numerical simulation of forward modeling and inversion algorithm research.This paper mainly discusses the finitedifference method of resistivity forward modeling algorithm and OCCAM regularizationinversion algorithm. Studied according to the line current source in the production potential ofunderground and finite difference method.Analysis of the different medium resistivity, surfaceleakage current of existence observation point and decorate uneven effects onobservations. through the establishment of different model and the way of potential gradientmethod of observation. One-dimensional layered model is established, and the layered modelOne-dimensional Occam inversion method is used for depth inversion of resistivity imaging,resistivity and smooth model of depth, Occam inversion of layered model inversion results, canexplain the preliminary data of field detection. This paper analyzes the field experimental data,and uses the least squares method, low-pass filtering, median filtering and average digitaltechnology to improve the signal-to-noise ratio. In this paper, fracturing Wells of Daqing tenfactories and Shanxi coal mine as an example, explain the general situation of the experimentalfield.