145 / 2022-02-27 11:35:40

基于无人机倾斜摄影的鄂西地区陡山沱组海相页岩露头表征

shale rock; unmanned aerial vehicle; knowledge database; digital outcrop; Doushantuo Formation; Qinglinkou

Shale rock is a type of fine-grained sedimentary rock and contains rich oil and gas resources. The marine sedimentary environment is the most favorable environment for the development of shale rock rich-organic matter. The Sinian Doushantuo Formation in the Qinglinkou outcrop field of Yichang has good exposure the marine shale rock, However, the characterization of marine outcrop field shale rock is insufficient at present. In this paper, the outcrop field data of the study area are collected, processed, and interpreted by using unmanned aerial vehicle oblique photogrammetric together with artificial investigation, and the quantitative geological knowledge base of shale rock is established and carried out the typical outcrop field anatomy analysis. The results show that the high-resolution image information captured by unmanned aerial vehicle oblique photogrammetric data is well coupled with the 3D coordinate system. By using the 3D digital model, the lithologic combination, thickness, and distribution of target Formation can be represented, and the quantitative reservoir geological knowledge database can be established. The second, third and fourth Members of the Doushantuo Formation contain 18 substrata. The second Member is mainly shallow-sea low-energy sedimentary facies with a total thickness of about 131.1 m. The third Member is characterized by paleo-carbonate platform deposits, and the second and the fourth Member are mainly paleo-deep water basin deposits. The second, third, and fourth Members are mainly composed of three different ratios of marine shale rock and dolomite rock, that is, when the ratio of shale thickness and dolomite thickness is more than 1, equal to 1 and less than 1. More than 1 is the most favorable reservoir for exploration and development, and it also provides important guidance for subsequent shale gas exploration.