A new superimposed model of the Tongnanba anticline in northeastern Sichuan and its exploration implications

Understanding the structural style, kinematic process, and timing of superimposed structures worldwide is often difficult due to complex structure deformation process. Fortunately, newly acquired high-quality seismic reflection data geological observations covering Tongnanba anticline provide an excellent chance characterize such structures. Here, we used from region evaluate style sequence anticline. In this regard, propose a new model northeastern Sichuan Basin, which are different that deep formed earlier than shallow demonstrated by previous studies, also discussed implications for oil gas exploration. Compressed Micangshan Dabashan thrust belts controlled three detachment layers, shows multi-stage, multi-directional, multi-level structure. There were layers vertically, leading style. Specifically, upper middle mainly South belt in early stage, forming long-distance extended NW-SE direction. A series pop-up propagated toward layers. On other hand, lower layer was primarily late basement faults NE-SW direction, consistent with Trishear fault-propagation fold. Along developed multiple branch slopes spread northeast southwest. The transformed faults, thus north-south zonation east-west segmentation at present. It control process hydrocarbon accumulation adjustment each layer, deep-ultra-deep ancient reservoirs may be worth exploring.