盐湖气田储层埋藏较浅,气层多,各气层含气面积相差悬殊。总体表现为高孔隙度、中—低渗透率的特点,气水界面不统一,为罕见的超浅层疏松砂岩小型边水气藏。国内浅层油气藏都具有勘探开发过程中井易出水出砂,产能比较低,稳产难度较大,生产过程中地层压力下降快、弹性产率低等特点。为实现小型气田的效益开发,依据气田的地质特点,在合理划分开发层系与开发层组的基础上,参考疏松砂岩边水气藏的井网部署方法,确定了盐湖气田沿轴线,占高点,顶密边稀的布井方式,采用由深至浅的开发方式,接替上返生产,实现井数少、成本低和长期稳产的目标,确保气田合理的储量、产能和产量的接替顺序,以获得最佳的开发效果和经济效益。

The reservoirs of Yanhu Gas Field are shallow buried with many gas layers, whose gas bearing areas are different. The reservoirs characterized by high porosity and medium to low permeability with no unified gas-water interface are the rare small edge water gas reservoir of ultra-shallow loose sandstone layer. In general, shallow oil and gas reservoirs in China are easy to produce water and sand in the process of exploration and development, of relatively low productivity, great stable production difficulty. In the process of production the formation pressure decreases quickly, and the elastic yield is low. In order to realize the benefit development of small gas field, according to the geological characteristics of the gas field, and on the basis of reasonably division of development layer series and group, the well distribution mode along the axis, occupying high point and dense at the top and sparse at edge for Yanhu Gas Field is determined by referring to the well pattern deployment method of loose sandstone edge water gas reservoir. Then adopting the development from deep to shallow is used to succeed the production by flowback, so as to realize the targets of long-term stable production with less wells and lower cost. Therefore, succession sequence of reasonable reserves, productivity and production for gas fields is ensured. Finally, the best development effects and economic benefit are obtained.