火山岩气藏高效开发策略研究

随着油气勘探技术的提高,在我国松辽盆地北部深层火山岩储层发现了大规模的天然气藏。针对火山岩气藏具有岩石类型多、岩性复杂、岩性岩相变化快、储层微裂缝发育、物性差、非均质性强、开发难度大的特点,采用多学科的方法对火山岩储层的岩性岩相、裂缝发育情况、储集空间类型、孔缝组合、基质和裂缝的有效性进行了研究与评价。在此基础上,对火山岩气藏的开发方式、层系划分、合理井距及井网部署、采气速度和稳产年限、采收率等进行了论证和优化,并制定了合理的开发方案。为了降低方案的风险,采取了整体部署及分批实施、优先开展加密先导试验、加强跟踪研究、及时调整的高效开发策略,取得了较好效果。

Strategy of high-efficiency development for volcanic gas reservoirs

The large scale gas reservoirs have been found in deep volcanic formation in the north of Songliao Basin of China.The volcanic gas reservoirs are characterized by various type rock,complex lithologies,sharp lateral variations of lithologies and lithofacies,development of microcrack,poor physical property,serious anisotropy and difficulty of development.The lithology,lithofacies,development degree of fracture,types of storage space,configuration of pore and fracture,and validities of matrix and fracture in deep volcanic formation were evaluated with multidisciplinary methods.The development mode,layer series of development,rational spacing between wells,deploy of well pattern,velocity of gas production,years of stable production and recovery factor were discussed and optimized on the basis of geological study.The reasonable development scheme for volcanic gas reservoir was compiled.The various technologies,including overall planning,implementation in turn,pilot test of infilling well pattern,following-up investigation,and regulation on time, were used in the development of volcanic gas reservoirs.The good results have been achieved.