摘要:
松辽盆地是处于西伯利亚板块、华北板块和太平洋板块所挟持的构造地带,属于佳蒙地块中的镶嵌状微地块活动造山带,为中-新生代陆相含油盆地叠合于晚古生代海相盆地之上的延变型叠合盆地。盆地内中、古生代地层,均呈"水、火"二元结构;区内火山-岩浆活动频繁,并有三多(多期、多旋回、多侵入-喷发中心)特征;具有"双机"(有机和无机)、"双相"(陆相和海相)叠合成藏特点;"开"与"合"型构造活动是坍塌裂谷的表象,从地表(陆相盆地)—地壳(海相晚古生代残留盆地)—岩石圈的"三层式"构造格局研究,呈现了NNE-NE与EW向"立交桥式"构造样式。简而言之,松辽盆地为一破盆(断裂丛生、火山-岩浆活动破坏)、矿盆(盆内油气藏丰富、边缘多金属矿产广为分布)、热盆(地热梯度甚高)、浆盆(盆地内外大量火山岩及岩浆岩分布)、歪盆(中央隆起的两侧的凹陷和断裂均不对称)和水盆(自古生界至中、新生界沉积岩产出)。针对叠合盆地成藏作用,可将深部的海相碳酸岩型油气藏或火山岩型气田作为找藏主攻方向,提出了"区域展开、重点突破"的战略方针和具体的深部找藏建议。通过研究和预测,初步认为深部具有良好的找藏潜力,坚信定能实现"百年大庆"的宏伟规划。
Abstract:
Songliao Basin is a structure belt controlled by the Siberian plate,North China plate and Pacific plate,which belongs to the mosaic micro-massif active orogenic belt in the Jiameng block.It is an extension and variant superimposed basin formed by Mesozoic-Cenozoic continental oil-bearing basin superimposing on the late Paleozoic marine basin.Mesozoic-Paleozoic strata in the basin show the dual structure of water and fire.Volcanic-magmatic activity in the area is frequent with the features of multi-period,multi-cycle and multi-intrusive-eruptive center,and it aslo has the superimposed oil reservoir with features of organic and inorganic,continental facies and marine facies.The "opening" and "closing" tectonic activity is the appearance of collapse rift.Based on the study of "three-layer" structure pattern of the surface(continental basin),crustal(marine late-Paleozoic residual basin) and lithosphere,it appears to be NNE-NE and EW "overpass type" structural pattern.In short,Songliao basin has the features of broken basin(fracture developed,volcanic-magmatic activity destructed),mine basin(basin rich in oil and gas reservoirs with wide distribution of polymetallic mineral on the edge of the basin),hot basin(geothermal gradient appear to be higher),magmatic basin(large amount of volcanic rocks and igneous rocks distributed within and outside the basin),crooked basin(depression and fracture on both sides of the central uplift are not symmetrical),and water basin(produced from the Paleozoic to Mesozoic and Cenozoic sedimentary rocks).In view of the reservoir forming effects of superimposed basin,and since deep marine carbonate rock type or volcanic rock type gas reservoir can be taken as the main direction of reservoir prospecting,a strategic guideline of "regional prospecting and major breakthrough" as well as concrete proposals of deep reservoir prospecting were also put forward.By the research and forecasting,it is preliminarily considered that the deep part has favorable reservoir prospecting potential,so it is aslo proved that the grand plan of "centennial Daqing" will be achieved in the future.
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