Patent AU-2016201034-B2 (AU)
Title: Method of quantitative calculation and assessment of bituman content in ancient carbonate reservoirs
Inventor: SHI SHUYUAN
IPC: G01V8/02
Filed: 2016-02-19
Granted: 2017-11-30
Abstract: The present invention provides a method of quantitative calculation and assessment of bitumen content in ancient carbonate reservoirs, comprising: sampling a reservoir at target intervals, grinding the collected carbonate core samples into thin sections, selecting at least one of view positions for each piece of the carbonate thin section at random, collecting an image of the view position; analyzing the collected image of the view position, defining distribution morphology of the bitumen in the collected image of the view position; highlighting display of the bitumen; acquiring a percentage of the bitumen in the image of a single view position; based on the obtained percentage of the bitumen in the image of the single view position in conjunction with the number of pictures randomly collected at a specific depth, obtaining a percentage of the bitumen at the specific depth; counting the percentage of the bitumen from a longitudinal direction and from a plane, respectively, and constructing a bitumen distribution histogram and a planar distribution graph thereof. The method of quantitative calculation and assessment of bitumen content in ancient carbonate reservoirs of the present invention can obtain the bitumen content in ancient carbonate reservoirs. 7394021 1 (GHMattersl P102191.AU GARYC Collecting samples of carbonate reservoirs at target intervals for the selected drilled well, grinding the collected samples into thin sections, observing the carbonate thin sections using an optical electron microscope, selecting at least one of view positions for each piece of the carbonate thin sections at random, and collecting an image of the view position According to a recognition principle of energy spectrum pixels, depending primarily on a color difference, analyzing and pre-processing images of all of the view positions collected in the step one, and highlighting display of the bitumen Acquiring a pixel value of the bitumen in the image of a single view position, and simultaneously recording a total pixel value of the image of this view position, thereby obtaining a percentage of the bitumen in the image of the single view position According to the percentage of the bitumen in the image of the single view position obtained in the step three in conjunction with the number of pictures randomly collected for carbonate thin sections at a specific depth at target intervals in the step one, calculating a percentage of the bitumen in the ancient carbonate reservoirs at this specific depth at target intervals using a method for weighted average value Calculating the percentage of the bitumen for each of the carbonate samples thin sections according to abovementioned steps, determining the percentages of the bitumen of an individual well and multiple wells at each different depth from top to bottom, obtaining a distribution histogram of bitumen content of the plural wells, and making an association to obtain a distribution graph of connecting-well bitumen content Calculating a bitumen content value of an individual well per unit of depth according to the percentage of the bitumen obtained in the step five, further determining a planar distribution graph of the bitumen using a method of delineation of interpolated values with contour lines fig.1