苏里格气田苏14井区二叠系下石盒子组盒8段多期叠置砂体储层合理开发方式研究

Study on development mode of multi-stage superimposed sandstone reservoir of He 8 member of the Permian Lower Shihezi Formation in Su 14 well block of Sulige Gasfield

苏里格气田苏14井区二叠系下石盒子组盒8段岩性气藏的主体储层为辫状河沉积体系形成的多种复杂叠置砂体,其叠置关系的认识对于气田的开发至关重要,如何制定合理工作制度成为气田高效开发的难题。通过分析气田储层砂体叠置关系,建立了不同类型生产井与叠置砂体分布关系模型,并利用数值模拟方法对不同砂体叠置模式下直井和水平井合理工作制度进行研究。结果表明,直井生产主要受到横向砂体叠置影响,纵向砂体叠置影响不大;纵向和横向砂体叠置均会对水平井生产带来明显影响;砂体叠置是造成苏里格气田稳产期短、产量开发早期就呈现递减的主要原因;间歇生产的工作制度能够更好地发挥地层能量,降低气井递减,起到很好的调峰作用。

The main reservoir of lithologic gas reservoir of He 8 member of the Permian Lower Shihezi Formation is multi-stage superimposed sand bodies in Su 14 well block of Sulige Gasfield,which are deposited in braided river sedimentary system.The understanding of the superposition relationship of sand bodies is crucial,and how to formulate a reasonable working system is challenging for the efficient development of the gas field.By analyzing the superposition of sandstone reservoir of the gas field,the distribution relationship models between various types of production wells and superimposed sand bodies are established,and reasonable working systems are proposed for vertical wells and horizontal wells with different superposition models of sand bodies by numerical simulation method.The results show that the production of vertical well is mainly affected by the lateral superposition of sand bodies,and the vertical superposition of sand bodies has little effect;While for horizontal well,both vertical and lateral superposition of sand bodies have significant impact on the production;Sand body superposition is the main reason for the decline of gas production in the early stage of Sulige Gasfield;The working system of intermittent production will better release the formation energy,delay gas well decline and play a good role in peak shaving.The study provides technical support for the efficient development of Sulige Gasfield and achieves good application results,which can be used as a reference for the gas field development of similar type of reservoir.