东溪气田嘉陵江组低效气藏地质特征与挖潜思路

东溪气田是川东地区首批钻探的老气田，地质资料不全，缺乏系统的研究成果。为更好地开展低效油气合作开发，挖掘资源潜力，有必要对该气田三叠系嘉陵江组低效气藏地质特征进行分析、总结和研究。通过对动、静态资料的分析认为，该气田嘉陵江组纵向上多产层特征突出，平面上产能分区明显，压力系统多样；并首次针对川东南部碳酸盐岩气藏，采用量化手段分析证明了裂缝对改善储层储渗性能的贡献。进而提出了该气田下一步挖潜思路：北段中渗区、顶部高渗区已进入后期挖潜生产阶段，应针对已有的报废井、低效井进行排查、制订科学开采措施；南段中低渗区今后的工作重点主要是选择有利部位部署井位，提高采气速度，最大限度提高产能；同时对于首次发现的东溪西潜伏构造，也提出了加快勘探开发的建议。

GEOLOGIC FEATURES AND PRODUCTION POTENTIAL TAPPING OF LOW-EFFICIENCY RESERVOIRS IN JIALINGJIANG FORMATION OF DONGXI GAS FIELD

Dongxi gas field, one of the earliest discovered old gas fields in the eastern Sichuan Basin, are incomplete in geologic data and have not been systematically studied. In order to better carry out cooperative development of the low-efficiency gas reservoirs and tap its resource potentials, it is necessary to analyze, summarize and study the geologic features of the low-efficiency gas reservoirs in the Triassic Jialingjiang Formation of this gas field. Based on an analysis of the dynamic and static data, it is believed that the gas reservoirs in the Jialingjiang Formation are characterized by vertical multilayered payzones, lateral zonation of deliverability, and multiple pressure systems. Quantitative methods are used, for the first time, to demonstrate the contribution of fractures to enhancing poroperm characteristics of the carbonate gas reservoirs in south of the eastern Sichuan Basin. Ideas are presented for future production potential tapping. The northern block with moderate permeability and the top block with high permeability have entered into the late stage of potential tapping, thus current abandoned wells and low-efficiency wells should be checked and a scientific recovery process should be formulated. While in the southern block with moderate to low permeability, future focus should be selecting favorable well locations, increasing gas recovery rate and boosting productivity as high as possible. Meanwhile, proposals of accelerating exploration and development are also presented for the buried structure encountered for the first time in the western Dongxi.