3D modeling method for cementing hydrate sediment based on CT image

A 3D modeling method for cementing hydrate sediment based on CT image, comprising steps of:

• step 1, scanning remolding or in situ rock cores without natural gas hydrate by CT to obtain digital rock core image stacks;
• step 2, adjusting the gray threshold of the digital rock core image stacks, conducting binarization segmentation to obtain a sediment matrix and a pore, and respectively saving as the image stacks;
• step 3, firstly dilating a sediment matrix image stack obtained in step 2 at x pixel and then eroding at x pixel;
• step 4, performing image subtraction;
• and subtracting the sediment matrix image stack obtained in step 2 from the sediment matrix image stack obtained in step 3 to obtain a cementing hydrate image stack;
• step 5, performing image subtraction again;
• and subtracting the cementing hydrate image stack obtained in step 4 from the pore image stack obtained in step 2 to obtain a new pore image stack corresponding to the cementing hydrate image stack obtained in step 4;
• step 6, splicing and combining the sediment matrix image stack obtained in step 2, the cementing hydrate image stack obtained in step 4 and the new pore image stack obtained in step 5 to form a digital rock core image stack with the sediment matrix, the cementing hydrate and the pore, which is the digital rock core image stack of the cementing hydrate sediment;
• step 7, repeatedly executing step 3 to step 6, and adjusting x value to obtain the digital rock core image stacks of the cementing hydrate sediment with different hydrate saturations.