Distribution of carbonate fractured and vuggy reservoirs of Maokou Formation in Luzhou Paleo-uplift during Dongwu Movement, Sichuan Basin

The Dongwu Movement which took place at the end of the middle Permian was an important crust movement in South China during Permian. The Luzhou Paleo-uplift was formed during the movement, which led to the uplift and erosion of the Maokou Formation and the formation of paleokarst reservoirs. Based on borehole data, a paleo-geological map of the Luzhou Paleo-uplift before the late Permian was described, and the paleo-geomorphology after erosion as well as the paleo-structure at the beginning of uplift were reconstructed. It was concluded that the Maokou Formation was seriously eroded in the center of the Luzhou Paleo-uplift. The Luzhou Paleo-uplift was in NNE direction with gentle limb in the northeast and steep limb in the southwest. The core of the paleo-uplift was featured by erosion plain. The Maokou Formation was seriously eroded and the paleokarst reservoirs were partially preserved on the gentle limb in the northeast and the adjacent core part of the uplift. The Maokou Formation was seriously caved and the paleokarst reservoirs were saved on the steep limb in the south-west and the adjacent core part of the uplift, where the most favorable areas of fractured and vuggy reservoirs in the Maokou Formation were located.