Reserves Estimation for Geopressured Gas Reservoirs JIANG, TONGWEN (ENGINEER, TARIM OILFIELD COMPANY, CHINA),SUN, HEDONG (RESEARCH ENGINEER, RESEARCH INSTITUTE OF PETROLEUM EXPLORATION AND DEVELOPMENT OF PETROCHINA, BEIJING, CHINA),WANG, HONGFENG (SENIOR ENGINEER, TARIM OILFIELD COMPANY, PETROLEUM INDUSTRY PRESS, BEIJING, CHINA),XIAO, XIANGJIAO (SENIOR ENGINEER, TARIM OILFIELD COMPANY, PETROLEUM INDUSTRY PRESS, BEIJING, CHINA)