本文關(guān)鍵詞：基于分形理論探究碳酸鹽巖CT圖像二值化最佳閾值　出處：《石油地球物理勘探》2017年05期 　論文類型：期刊論文

  更多相關(guān)文章： 碳酸鹽巖 微觀孔隙 CT圖像 分形 孔隙度 最佳閾值

【摘要】：CT掃描構(gòu)建數(shù)字巖心的一個重要環(huán)節(jié)是灰度圖像的二值化。本文基于圖像處理分析和分形理論計算孔滲參數(shù),為CT圖像二值化提供了更準(zhǔn)確、更適用的約束條件�？锥葱吞妓猁}巖不同形態(tài)和尺度的微觀孔隙累積數(shù)量與半徑分布遵循冪律關(guān)系,具有統(tǒng)計意義上的分形特征,且分維值與孔隙度之間存在非線性定量關(guān)系。通過自定義四連通像素值梯度突變算法與分形理論相結(jié)合的方法,統(tǒng)計分析了孔隙形態(tài)、數(shù)量等參數(shù)并計算了孔隙度,其平均誤差小于7.2%;改進"先二值化后邊緣識別"的常規(guī)方法,運用濾波降噪和邊緣識別算子識別標(biāo)定CT灰度圖像微觀孔隙,既保證了精度又提高了效率。根據(jù)這兩種圖像處理技術(shù)可確定最佳灰度閾值,實現(xiàn)CT圖像二值化。該方法處理的二值圖像較好地保留了不同尺度微觀孔隙結(jié)構(gòu)的形態(tài)和分布特征,因此可廣泛應(yīng)用于常規(guī)巖心重構(gòu)及后續(xù)的三維數(shù)字巖心的構(gòu)建。
[Abstract]:The binarization of gray image is an important part of constructing digital core by CT scanning. Based on image processing analysis and fractal theory, the calculation of pore and osmotic parameters provides a more accurate method for the binarization of CT images. The microcosmic pore accumulative quantity and radius distribution of pore type carbonate rock in different shape and scale follow the power law relation and have the fractal characteristic in statistical sense. And there is a nonlinear quantitative relationship between fractal dimension and porosity. The pore morphology is statistically analyzed by the combination of self-defined four-connected pixel value gradient mutation algorithm and fractal theory. The average error of porosity is less than 7.2. The conventional method of "first binarization and then edge recognition" is improved. The filter noise reduction and edge recognition operator are used to identify and calibrate the micro pores of CT gray images. It not only ensures the accuracy but also improves the efficiency. According to these two image processing techniques, the optimal gray threshold can be determined. The binarization of CT images is realized. The binary images processed by this method can preserve the morphology and distribution characteristics of micro-pore structures of different scales. Therefore, it can be widely used in conventional core reconstruction and subsequent three-dimensional digital core construction.
【作者單位】： 中國科學(xué)院大學(xué)滲流流體力學(xué)研究所;中國石油勘探開發(fā)研究院廊坊分院;蘭州工業(yè)學(xué)院電氣工程學(xué)院;
【基金】：國家重大科技專項(2011ZX05013-002)資助
【分類號】：P618.13
【正文快照】： *河北省廊坊市44號信箱,065007。Email:guomwu@163.com本項研究受國家重大科技專項(2011ZX05013-002)資助。吳國銘,李熙U，

本文編號：1408596