Abstract: The fracture-vuggy structure and connection relationship of fault-controlled fracture-vuggy carbonate reservoirs are complex, and traditional well pattern deployment is prone to produce low-productivity wells. A three-dimensional injection and production well pattern needs to be constructed to increase productivity. The influence of different factors on the sweep coefficient of the three-dimensional injection and production well pattern in the Manshen 3 and Manshen 4 well areas of the Tarim Fuman Oilfield was studied through reservoir numerical simulation, and a pilot test plan was designed to predict productivity. The results show that the sweep coefficient is the largest when the gas injection wells and production wells are arranged in a single staggered manner in the Manshen 3 well area; the greater the depth of the production wells, the greater the sweep coefficient; the sweep coefficient is stable within the range of 500$\sim$1 000 m between injection and production wells, and decreases significantly when the distance increases to 1 500 m. The sweep coefficient is the largest when gas injection wells, water injection wells and production wells are arranged in a single staggered manner in the Manshen 4 well area. In the pilot test, the plans of ``N$_2$ injection in the shallow part and production in the deep part" and ``N$_2$ injection in the top part, water injection in the bottom part, and production in the middle part" are adopted in the Manshen 3 and Manshen 4 well areas respectively. The recovery rates at the end of the stage reach 21.3% and 22.4% respectively, which is a significant improvement compared to the basic depletion development and water injection development plans.

Key words: Fuman Oilfield, fault-controlled fractured-vuggy reservoir, carbonate rock, three-dimensional injection and production well pattern, well pattern construction, sweep coefficient