延安低渗致密气勘探开发工业化应用效果分析

Analysis on the Industrial Application Effect of Yan’an Low-permeability Tight Gas Exploration and Development

鄂尔多斯盆地油气资源非常丰富,已经发现的大气田位于盆地北部,传统认为具有"南油北气"的格局。延长石油所处的盆地东南部存在南北物源交汇区有效储层规模小、相变快、分布零散、储层精细预测难度大和多气层大跨度复杂叠置、高效动用难度大等问题,通过近10年的勘探开发技术攻关,取得了盆地东南部上古生界沉积体系新认识,建立了成熟烃源灶迁移控制成藏模式,发现了延安大气田。通过分析成藏条件特殊性,对延安气田地质特征实现深入了解,理清了产区开发井部署思路,研发VES-CO2泡沫压裂和高效酸化压裂等气井增产技术,现累计探明天然气地质储量6.650×1011 m3,累计建成5.0×109 m3·a-1产能,工业化应用效果较好,将天然气勘探扩展到了东南部,改变了盆地致密气藏沉积传统格局。

The oil and gas resources in Ordos basin are very rich.The discovered gas fields are mainly located in the northern part of the basin.It is traditionally considered to have a pattern of"southern oil and northern gas".In the southeastern part of the basin,there is the north-south source-source intersection area,it has characteristics of rapid phase change,scattered distribution,difficult reservoir prediction and complex stacking of multi-gas layers,and big production difficulty.In the past 10 years,based on development of the exploration and development technologies,a new understanding of the Upper Paleozoic sedimentary system in the southeastern basin was obtained,and a migration model for the migration of mature hydrocarbon source was established,and Yan’an gas field was discovered.The accumulated natural gas reserves of 6.650×1011 m3 have been proven,and 5.0×109 m3·a-1 production capacity has been built.The exploration of natural gas has been extended to the southeast,changing the traditional pattern of tight gas reservoirs in the basin.