The Early Cambrian Mianyang-Changning Intracratonic Sag and Its Control on Petroleum Accumulation in the Sichuan Basin, China

Figure 5

2D seismic profile across western margin of the Mianyang-Changning intracratonic sag. F-F′: SE-striking Qianwei section in southern segment of the sag; G-G′: NW-striking Zigong-Ziyang section, showing a distinct decrease in steepness of the western sag boundary from the north to the south.