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川东地区石炭系气藏的气水界面主要分布在两个范围内，一是潜伏构造气藏的气水界面海拔较深，一般为-3800～-4700m；另一是主体构造气藏的较浅，一般为-1600～-2600m。各构造带之间相邻的潜伏圈闭气藏往往受同一大向斜内的水域相隔，并在原始状态下相互维系了气水的压力平衡，因此同一向斜内某一构造的水井资料就可用于计算另一构造同一气藏的气水界面。基于这种认识，章根据同向斜域内相邻构造的水井资料计算卧龙河、双家坝、云和寨、高峰场、胡家坝等气田的原始气水界面，得到的气水界面与实际误差为-3～-18m。说明该方法在实际应用中可靠性较好，可节省钻井投资，缩短气田的评价周期。

Application of the Data on Water Wells in the Same Synclinal Area in Determining Gas-Water Contacts

??The sea-levelelevations of gas-water contacts in Carboniferous reservoirs in East Sichuan are mainly composed of two parts;ones are -3800??-4700m for the buried structures;and the others are -1600??-2600m for the high-steep structures.The adjacent buried gas reser voirs between various structural belts are always separated by water bearing area in the same large syncline and the gas-water pressure equilibrium was muturally maintained in original conditions.Therefore,within the same syncline,the data on the water well in one structure may be used for calculating the elevation of the gas-water contact in the same gas reservoir in the other structure.In light of such an understanding,the elevations of the original gas-water contacts in Wolonghe,Shuangjiaba,Yunhezhai,Gaofengchang and Hujiaba gas fields were calculated by use of the data on water wells in the adjacent structures in the same synclinal area and,as compared with the elevations measured,the errors are -13??-18m,which indicates that this method is of good reliability and the drilling investment may be saved on and the evaluation period of gas field can be shortened by use of such a method.