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火山岩储层是松辽盆地深层天然气勘探的主要目的层 ,分布上主要受深大断裂控制 ,沿断裂成带分布 ,不仅分布在山岭地区也广泛分布在断陷盆地的沉积地层中 ;储集空间为原生气孔、杏仁体内孔、次生的斑晶溶蚀孔、基质内溶孔和构造溶蚀裂缝 ;孔隙结构组合为单一裂缝及斑晶溶蚀孔与裂缝组合而成的孔隙结构 ;在成因上分为喷发溢流时形成原生气孔 ,喷发间歇期受风化淋滤形成次生孔隙及在埋藏过程中成岩、构造作用的影响 3个阶段 ;裂缝是改善火山岩储层性能的关键因素 ,成岩作用既加剧了次生孔隙的充填也加剧了溶蚀孔隙的形成 ,压实作用对储层物性没有影响。火山岩在烃源岩中相对独立的分布使其具有得天独厚的成藏条件 ,构造运动和后期风化剥蚀是控制储层物性的主要因素 ,断裂的发育程度控制了气藏的分布。
Volcanic reservoirs are the main targets for the deep natural gas exploration in the Songliao Basin. The distribution is mainly controlled by the deep faults and distributed along the faults. The volcanic reservoirs are not only distributed in the mountain areas but also widely distributed in the sedimentary strata of the fault basin. The reservoir space Which are primary pores, apical alginate pores, secondary epididymal dissolution pores, matrix dissolution pores and structural erosion cracks. The pore structure combination is a pore structure composed of a single fracture and a porphyry dissolution hole combined with a fracture. The pore structure is divided into The formation of primary pores during eruption and eruption, secondary porosity during eruption and formation of secondary pores by weathering and leaching, and the influence of diagenesis and tectonism during burial process are the three stages. Cracks are the key factors to improve the performance of volcanic reservoirs. Diagenesis aggravates The filling of secondary pores also exacerbated the formation of dissolved pores, and the compaction did not affect the reservoir physical properties. The relatively independent distribution of volcanic rocks in hydrocarbon source rocks makes it a unique reservoir forming condition. Tectonic movement and late weathering denudation are the main factors controlling reservoir physical properties. The development of faults controls the distribution of gas reservoirs.