| Abstrakt: |
Aiming at the problem that single conventional method can't effectively characterize the micro-pore structure of shale reservoir, taking Qingshankou Formation Shale in the south of Songliao Basin as the research object, using nuclear magnetic resonance technology (NMR), high-pressure mercury injection technology, low-temperature nitrogen adsorption technology, computed tomography (CT) and other technologies to measure the pore size and distribution characteristics of different scales of shale reservoir, and then characterize the pore structure. The results show that using one-dimensional NMR, it can be recognized that the T2 spectrum of pure shale is mainly distributed below 10ms (25nm), and the identification accuracy of freeze-thaw NMR is higher than that of one-dimensional NMR. It can be recognized that the pore size of interlayer shale is larger than that of pure shale by high pressure mercury injection method. Nitrogen adsorption experiment at low temperature shows that the pore size of shale matrix is mainly distributed between 10 nm and 100 nm, and the proportion of micropores and mesopores in Nano-scale pores is large, while the proportion of macropores is small. CT+VG model rendering can visually show the development of cracks. Finally, combining the advantages and disadvantages of multiple methods, the splicing process of two different methods to measure pore structure is formed. Multimethod fusion for characterization of shale reservoir microstructure technology provides experimental support for the implementation of shale oil development parameters, the study of shale oil occurrence and production law and the further improvement of shale oil and gas development effect. [ABSTRACT FROM AUTHOR] |
