Digital Representation of Microstructures of Cretaceous Formation Rock Cuttings in the Tarim Basin
Hao Liang, Junqiu Luo, T. Wen, He Yan, W. X. Feng, Yan Jin, Ying Xia · 2024
ABSTRACT: The Cretaceous Baxigai formation and Shushanhe formation in the Tarim Basin are characterized by the development of high-maturity hydrocarbon source rocks, and the extensive development of tectonic and lithologic traps, which have good prospects for oil and gas exploration. However, it is in the deep-ultra-deep zone, where complicated accidents occur frequently in drilling, logging is difficult to carry out, and the lack of complete cores is not conducive to rock mechanics-related research. In this paper, we use AMICS to form a pseudo-color map of mineral distribution, complete the denoising step based on the image segmentation of RGB images, then use the "8-neighborhood method" to obtain the edge coordinates of the mineral particles, and finally fit the edges by the "least-squares method", and then digitally reconstruct the microcosm of the rock chips. Finally, the edges are fitted by the "least squares" method to digitally reconstruct the microstructure of the rock chips. The algorithm established in this paper solves the problem of missing cores in the Cretaceous strata of the Tarim Basin, realizes the digital characterization of rock microstructures, and provides a digital geometric model for the subsequent numerical simulation work, based on which the related research can be carried out. 1. INTRODUTION With the development of oil and gas industry, it has become the main trend of conventional oil and gas exploration and development to advance to the deep and ultra-deep neighborhood. The Tarim Basin is rich in oil and gas resources, and in recent years, there have been continuous breakthroughs in exploration and development. The natural gas of the Tarim Basin is mainly enriched in the depression at the periphery of the basin and in the Paleozoic carbonate rocks, among which the tertiary reserves of natural gas in the Kuche depression exceed one trillion cubic meters, and it is the main source of gas for China's "West-to-East Natural Gas Pipeline" project (Ke et al., 2014).