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鄂尔多斯盆地神木区块二叠系山西组是继太原组之后新的致密砂岩气接替层系,单井产量低、研究程度浅、认识不足的特点制约了该区山西组致密砂岩气的有效勘探开发。通过铸体薄片、物性分析、核磁共振等技术手段,深入剖析了山西组致密砂岩气低产原因及主控因素。低孔低渗、孔喉结构复杂、应力敏感性较强的差储层品质及束缚水饱和度远远大于初始含水饱和度的超低含水饱和度现象导致储层渗流较差,易形成水锁,是致密砂岩气低产的原因;而沉积非均质性和破坏性的成岩作用极大地降低了储层物性,使气井外围储层流体补给不畅,是低产的主控因素。研究为制定合理的储层压裂改造工艺措施、提高单井产量以及实现致密砂岩气藏的规模有效开发提供了重要的地质依据。
The Permian Shanxi Formation in the Shenmu block of the Ordos Basin is a new tight sandstone gas successional succession after the Taiyuan Formation. The low single well productivity, lack of knowledge and insufficient understanding restrict the effective exploration and development of the tight sandstone gas in Shanxi Province . The causes and main controlling factors of low production of tight sandstone gas in Shanxi Formation are analyzed in depth by casting thin slices, physical property analysis and nuclear magnetic resonance. Low porosity and low permeability, complex pore and throat structure, poor stress sensitivity, poor reservoir quality and irreducible water saturation, which is far greater than the initial low water saturation of water saturation, resulting in poor reservoir seepage and easy water lock formation , Which is the reason for the low production of tight sandstone gas. The sedimentary heterogeneity and destructive diagenesis greatly reduce the physical property of reservoirs, which makes the fluid supply outside the gas well poor, which is the main controlling factor of low production. The research provides an important geological basis for formulating reasonable measures of reservoir fracturing reformation, improving single-well production and realizing the effective development of tight sandstone gas reservoirs.