To address the issues of poor fracture development, high mud content, low matrix porosity, difficult reservoir activation, and low production in the southwest area of the K Oilfield in the South Turgai Basin, volume fracturing technology was proposed. This technology can reduce cluster spacing, increase the number of fractures, significantly increase the fracture-controlled volume, and achieve zonal control within the formation. It can significantly mobilize the reservoir and further tap remaining reserves. Through in-depth research on reservoir characteristics, changes in the oil–water interface, stress direction, and distribution characteristics of remaining oil, it was found that although the production of old wells in the southwest region is low, oil and gas show activity without obvious bottom water characteristics. There is still residual oil around the well, which has the potential for large-scale volume fracturing transformation. Ultimately, effective communication of potential remaining oil was achieved through fracturing, which increased the degree of crude oil recovery in the area. Based on the fact that the water cut has not increased significantly, the daily oil production of a single well has increased by 7 times. This technology is suitable for carbonate hydrocarbon reservoirs in Kazakhstan, filling the gap in Kazakhstan due to the lack of effective methods to increase production in such reservoirs, and providing an effective reference method for the efficient development of carbonate hydrocarbon reservoirs in this basin.