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大民屯凹陷静安堡西侧低潜山储层裂缝以高角度缝为主 ,次为倾斜缝。裂缝的发育经历了中生代晚期早第三纪早、中期和早第三纪晚期两次大的形成期。物性分析表明 ,潜山变质岩储层基质孔隙度很低 ,一般只有1%～ 5 % ,渗透率大多低于 1× 10 -3 μm2 ,因此这些基质孔隙对油气储集作用非常有限 ,构造裂缝是变质岩储层的主要储集空间和运移通道。裂缝的形成与发育程度受岩性、断层、埋深及古风化作用的影响 ,随着岩石中浅色矿物的增加 ,岩石脆性成分变多 ,岩石的宏观裂缝就越发育 ;越靠近断层和构造活动区 ,裂缝发育程度就越高 ;裂缝的有效性随着埋深的增加而变差 ,甚至成为无效裂缝 ;一般来说 ,潜山风化带顶面的裂缝较发育 ,但这些裂缝容易受到泥质的充填 ,极易成为无效裂缝。因此 ,潜山风化带的储集物性并不一定好。
The fractures of low buried hill reservoirs on the west side of Jing’an Fort in Damintun Depression are dominated by high-angle joints, and the second is inclined slits. The development of fractures experienced two large formations of early, middle and early Tertiary in the late Mesozoic. Physical property analysis shows that the matrix porosity of the metamorphic reservoirs in the buried hill is very low, generally only 1% -5%, and the permeability is mostly lower than 1 × 10 -3 μm 2. Therefore, these matrix pores play a very limited role in hydrocarbon accumulation. Is the main reservoirs of metamorphic reservoirs and migration channels. The formation and development of fractures are influenced by lithology, fault, burial depth and paleo-weathering. With the increase of light-colored minerals in the rock, the brittle component of rock increases and the macroscopic fracture of rock grows more. The closer it is to faults and structures Active areas, the higher the degree of fracture development; the effectiveness of fractures worsened with the increase of burial depth, and even become ineffective fractures; Generally, the cracks on the top surface of the buried hill weathering belt are more developed, but these cracks are susceptible to mud Quality filling, easily become invalid cracks. Therefore, the reservoir of buried hill weathering belt is not necessarily good.