摘要
松辽盆地火山岩相可分为5相、15亚相。5相为火山通道相、爆发相、喷溢相、侵出相和火山沉积岩相。火山岩孔、缝及其组合关系受亚相控制。喷溢相上部亚相原生气孔和构造裂缝发育,储集物性优良;爆发相各个亚相之间常发育松散层构造,是有利的储集空间;侵出相内带亚相原生裂缝和粒间空隙发育,是优质的大型储集体。不同亚相的成岩方式不同,有熔浆冷凝胶结、压实成岩和二者复合3种方式。火山沉积岩相、爆发相的空落亚相和热基浪亚相均以压实成岩为主,其物性随埋深增加变差;火山通道相、喷溢相和侵出相均以熔浆冷凝固结成岩为主,其孔、渗与埋深无关。爆发相的热碎屑流亚相是复合成岩,其储层物性与埋深的关系视两种成岩方式相对弱而变化。
The reservoir volcanic rocks of the Songliao Basin include upper Jurassic Huoshiling Formation, lower Cretaceous Yingcheng Formation. Based on the cuttings/core sections and outcrop descriptions as well as 2 4 seismic interpretation of the volcanic rocks around and within the Songliao Basin. The authors of the paper classify the reservoir volcanics into five facies and fifteen sub-facies which are described as to their identifying signatures of lithology, texture, structure and relationship between sub-facies and reservoir features. Sub-facies type is a important controlling factor on the porosity and permeability of the reservoir volcanic rocks. The upper effusive facies sub-facies(Ⅲ3)are rich in both primary vesicles and fault cracks being good reservoir rocks. Circular primary cracks are generally well developed in the extrusive pillow lavas resulted from large-scale unconsolidated body within volcanic dome that is one of the best reservoirs. Loose units, covered by hard volcanic layer and preserved owing to rapid cooling of lava, are common in between the effusive facies. They are good reservoirs, too. Porosity and permeability of volcanic rocks can decrease with buried depth if their diagenesis is compaction dominant. Those are the cases of volcanogenitic sedimentary facies and subfacies of base surge deposits. For the rest facies of the volcanic rocks, reservoir features are not influenced by buried depth.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2003年第4期449-456,共8页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金资助项目(4989419013)
