Comparison and evaluation of calculation methods for dynamic reserves of DC structure

In order to reasonably exploit the lower Permian gas reservoir of DC structure, DS1 and DS001–x1 wells with long production history are selected to calculate the dynamic reserves of the two wells by material balance method, modern production decline analysis method, production history fitting method and production accumulation method. The results show that the dynamic reserves of the two wells are large and have great exploitation potential. The calculation process of the methods is relatively simple, but the production accumulation method needs to be used after a certain degree of gas reservoir development and continuous decline of gas well production. At present, the results of the material balance method, the modern production decline analysis method and the production history fitting method are relatively accurate.