High Precision Curvature Analysis And Its Application Of Structural Identification

Along with the development of 3d seismic technology, using attribute structure interpretation in geological interpretation personnel become common method. In recent years, curvature properties are more and more concerned, people find curvature properties of structural identification is very useful. A new high-precision curvature analysis based on the fault identification method was proposed by adaptive median filter and curvature analysis . It overcomes the conventional coherence cube analysis's defect that the function of suppressing noise and identifying small faults is not very effective. The method takes full advantage of the better de-noising result of the adaptive median filter and the high sensitivity of the maximum positive curvature analysis for the fault. The actual data results show that the proposed high-precision curvature analysis based on the fault identification method is easy and efficient and can effectively carry out a large, medium and small scales of different faults, fault recognition rate is significantly higher than the conventional coherence cube analysis.On the other hand, from the perspective of curvature analysis in the field of imagery processing, the paper proposed a new simulation method of tectonic stress based on curvature analysis, which was deduced by the relationship of curvature -stress-strain. The new method directly study the time slice of objective stratum. Firstly it calculated the curvature based on fitting method, secondly built the layered model of Young's modulus based on log data, then calculated the tectonic stress by the curvature -stress-strain formula, which was the procession of tectonic stress filed simulation based on posted seismic data. To overcome the difficulty of conventional method based on finite element modeling, the method needn't to build complex rock strata model, and was a simple and efficient method. Results of practical calculation proved the correctness and validity of the new method by the corresponding prediction result with fluid prediction of reservoir. The research of this thesis has been divided into the following aspects:(1) The method of adaptive median filter. In this method, first, the whole image will be divided into sub images of K ,then respectively statistics the number of noise points in each sub image. At last, the method will automatically choose the size of the filter window in each sub image according to the number of noise points in each sub image.(2) Fault identification based on curvature analysis. Firstly this method remove noise by adaptive median filter, secondly it calculated the most-positive curvature based on fitting method, thirdly it interpret the fault by extracting the most-positive curvature slice of the horizon we need, finally compare the result of this method to the result of coherence cube analysis.(3) Tectonic stress field simulation based on curvature analysis. The new method directly study the time slice of objective stratum. Firstly it calculated the curvature based on fitting method, secondly built the layered model of Young's modulus based on log data, then calculated the tectonic stress by the curvature -stress-strain formula, which was the procession of tectonic stress filed simulation based on posted seismic data.