Early Paleozoic Extension-Compression Transition and Formation of a Paleo-Oil Reservoir System in the NW Sichuan Basin: Implications for Deeply Buried Hydrocarbon Accumulation

Figure 1

(a) Simplified map of China that shows the location of the Sichuan Basin (gray). (b) Simplified digital elevation map that shows the location of the Sichuan Basin on the eastern boundary of the Tibetan Plateau. The northern segment of the western Sichuan depression (NSWSCD) is at the basin-mountain junction [1] of the Longmenshan Thrust Belt (LMS TB). The blue box represents the main study area. (c) 1 : 200,000 geological map of the NSWSCD, which shows the distribution of oil and gas plays (red frame) in the Houba, Qinglinkou, Tianjingshan, Shangsi, and Nianziba areas.