柴达木盆地一里坪地区天然气成藏条件与勘探潜力

在柴达木盆地一里坪地区新近系中,近期发现较好的天然气显示。从天然气源岩评价入手，开展了有机质丰度、生烃史分析、气源对比研究，在此基础上建立了天然气成藏模式，估算了新近系天然气资源潜力，分析了有利勘探区带。认为新近系天然气为热成因气，其源岩丰度中等偏差，有机质类型以Ⅲ型和Ⅱ₂型为主，初步估算一里坪新近系含气系统天然气资源量约为1.5×10¹²m³，一里坪凹陷西缘构造带埋藏较浅、构造形成相对较早，是下一步勘探的有利区带。

The Conditions of Natural Gas Accumulation and Exploration Potential in Yiliping Region,Qaidam Basin

Recently a new type of natural gas was found in the Neogene of Yiliping region,Qaidam basin.The paper evaluated the conditions of the natural gas source rock,established the accumulation model of this natural gas,calculated the amount of the natural gas resources preliminary and analyzed the favorable exploration zones.The authors believe that the gas in Neogene System is the thermogenic gas,the main types of organic matter are Ⅲ and Ⅱ₂,there is a huge amount of natural gas resources,the westen tectonic belt of Yiliping depression is the favorable zone of next exploration because it is not only shallow burial,but also formed earlier.The article studied the accumulation conditions and exploration potential of Yiliping gas system,enhanced the understanding of the geology of this area,this will guide further research and deployment.