致密砂岩气藏难动用储量影响因素及其开发对策

IMPACTING FACTORS AND DEVELOPING METHODS OF HARD-TO-RECOVER RESERVES IN COMPACTED SANDSTONE GAS RESERVOIRS

川西坳陷难动用储量多存在于低渗致密气藏之中,具有“低、小、散、差”的地质特点和“低、快、短、大”的开发特征,其主要影响因素有储层本身地质条件、工艺技术水平、经济环境以及企业管理模式和开发政策等,但随着开采工艺技术的改进和完善、经济政策的变化、管理模式的优化配置,部分难动用储量可转化为可动用储量或经济储量,因此它又具有时间性和阶段性。强化致密砂岩气藏描述和难动用储量评价工作,注重全程气层保护技术,开发和改进储层改造工艺技术,配套的中后期提高采收率技术以及灵活的管理方式和运行机制、积极的天然气开发政策都可以促进难动用储量得到最大限度地开发。川西地区难动用储量蕴藏着较大的开发潜力,其开发对策的研究具有较好的社会效益和经济利益。

Most of the hard-to-recover reserves in the western Sichuan depression exist in low-permeability compacted gas reservoirs. Main impacting factors on their development include geologic condition of the reservoir formation, technical level of development, economic environment, enterprise management mode and development plans, etc. However, 'hard-to-recover' is actually a time-depending concept, because part of such reserves can become recoverable or economic with improvement of previous impacting factors. Such improvement can be strengthening characterization of compacted sandstone gas reservoirs and e-valuation of such reserves, emphasizing gas zone protection during the whole developing process, developing and enhancing new technologies, deploying EOR methods at the middle or late developing stages, implementing flexible management methods and positive development plans, etc. All these are useful to improve the recovery rate to a great degree, resulting in considerable social and economic benefit.