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廊固凹陷是华北油田下第三系产气的主力凹陷 ,是最早向京供气的产气区 ,现在是陕京输气管线向北京供气的应急调峰的重点后备地区。文章主要从构造特征、天然气成因类型、生储盖组合特征、天然气保存条件等方面阐述了廊固凹陷中西部下第三系天然气藏的形成条件及富集规律。重点阐述了中浅层天然气的成因类型及天然气的成藏条件 ,建立了该地区气藏的成藏模式。勘探实践证明 ,该区天然气资源丰富 ,构造、储层、运移与保存配置合理 ,成藏条件优越 ,完全具备形成较大储量规模的气田。尤其是旧州—固安构造带勘探程度较低 ,又有多个有利构造 ,应是比较现实的勘探领域。
Langgu Sag is the main depression of gas production in the Lower Tertiary of Huabei Oilfield. It is the earliest gas producing area supplying gas to Beijing and now it is the key backup area for the emergency peak shaving of gas supplied by Shaanxi-Beijing gas pipeline to Beijing. In this paper, the formation conditions and enrichment rules of the Lower Tertiary natural gas reservoirs in the central and western part of Langgu Sag are described from the aspects of tectonic characteristics, types of gas genesis, characteristics of gas pools and caprocks, and natural gas preservation conditions. The type of natural gas in middle and shallow layers and the condition of gas accumulation are mainly described, and the mode of gas accumulation in this area is established. Proved by exploration, the natural gas resources in this area are abundant, with rational configuration, reservoirs, migration and preservation and favorable reservoir forming conditions, and are fully equipped with gas reservoirs with larger reserves. In particular, the old state-Gu’an tectonic belt has a low degree of exploration and a number of favorable structures, so it should be a more realistic exploration area.