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Combined with the scanning electron microscopy (sem), mercury injection test and other microscopic experiment technology, technology of high-resoluti on 3D reservoir characterization based on the CT imaging was used to sduty the microscopic pore structure of tight oil reservoir in Fengnan Area, sourtheast of junggar basin. From macroscopic to microcosmic, in accordance with the principle of 2D to 3D, the experiments went on one by one, aiming to optimize the experiment sample. Some samples with a diameter of 65 μm was derived and scanned by high-resolution Nano-CT, then a three-dimensional texture model of nano-scale pores was established and then the porosity datas of samples in different depth could be obtained and analysized .A clear understanding of the size, shape, spatial distribution and connectivity of the pore throat could be got as well. Experimental analysis shows that, on a micrometer scale, the size of experimental sample pore throat varies violently, and their radius range from 2 to 50 μm, distributed in or between grains isolatedly or in a shape of a band. The pore throats are fewer but account for a large pore volume. On a nanometer scale, the radius of pores mainly range from 0.05 to 0.3 μm, and the quantity of nanoscale pores increases. The pore throats are arranged in the shape of tube and ball inside or on the surface of mineral particles (crystals). The ball-shaped micropores in nanoscale, often isolate in the 3D space, show the poor connectivity and consequently act as the reservoir space. The porosities calculated using the Nano CT are close to the results analysized by core samples.

Technology of High Resolution CT Study on the Application of Pore Structure Research in Tight Oil Reservoir