广安地区须六段气藏特征及开发策略

CHARACTERISTICS OF THE SIXTH MEMBER OF XUJIAHE FORMATION (T3x6)GAS RESERVOIRS IN GUANG'AN AREA AND ITS DEVELOPMENT TACTICS

广安地区须六段气藏是目前四川盆地内须家河组储量规模最大的气藏。在目前天然气市场需求旺盛的新形势下,该气藏高效、快速建产已迫在眉睫。综合测井、岩心、测试、试采等资料分析认为,针对该气藏构造平缓,气藏圈闭类型为构造—岩性复合圈闭,储层储渗类型以孔隙型为主,裂缝不发育,低孔低渗、砂体连通性差,含水饱和度较高,气水关系复杂,气井自然产能低等特征,建议在气藏开发过程中,宜采用整体部署、区别对待、分步实施的开发策略,同时,充分利用新工艺、新技术,充分发挥气井产能,以降低开发投资风险,提高气藏资源利用率,实现规模化、效益化开发。

T3x6 reservoirs with a huge sum of the explored reserves in the Guang'an gasfield was declared to be the largest scale one in the Xujiahe Group of Sichuan Basin. Under the present situation of great demand for natural gas in the global market, it is high time for this reservoir to be thrown into production in high efficiency as soon as possible. Therefore, aiming at the reservoir in T3x6 characterized by gentle structure, structure lithologic composite traps, porous formations, undeveloped fractures, low porosity and low permeability, bad connectivity between sand bodies, high water saturation, complex relationship between gas and water, and low natural productivity of gas wells, some positive suggestions were put forward in development tactics, such as deployment as a whole, discrimination treatment, and performance step by step. Meanwhile, in order to mitigate the risk of investment in gas development, and to improve the energy utilization efficiency, new technology and techniques should be fully used to employ the productivity of gas wells to develop the gas reservoirs in a large scale with the maximum profit.