松辽盆地北部深层气藏类型及形成条件分析

本根据气藏成因及储层岩性，将松辽盆地北部深层划分为层状构造砂岩、古潜册花岗岩风化壳、地层超覆砾岩，火山岩岩性，不整合面下的千枚岩和不整合面上的砾岩６种类型气藏；阐述了深层气藏的形成条件，即具有面积和厚度大的生烃断陷，能够进行天然气运移的侏罗系顶和基岩顶的２个不整合面，存在于株罗系地层周边的地层超覆圈闭，以及致密砂岩，砾岩，山岩和花岗岩储集层；并指出了天然气藏分布规律是以烃源岩区为中心，向外依次为

A DISCUSSION ON TYPE AND FORMATION OF DEEP GAS RESERVOIR IN NORTHERN SONGLIAO BASIN

Based on origin of gas reservoir and reservoir lithology, this paper describes six types of gas reservoirs in deep northern part of Songliao basin including bedded sandstone, granite weathering zone of buried hill, conglomerate rock of stratigraphic overlap, volcanic rock,phyllite below unconformity surface and conglomerate rock above unconformity surface,describes the formation conditions of deep gas reservoirs which are hydrocarbon generating downchasm with large area and great thickness, two unconformity surfaces i.e. top surface of Jurassic system and top surface of base rock as gas migration path, and stratigraphic overlap trap, tight sandstone, conglomerate rock, volcanic rock and granite reservoirs around Jurassic formation, and points out the distribution characteristics of gas reservoirs.