摘要
通过天然气组分、碳同位素单体烃组成和天然气浓缩轻烃指纹化合物特征对比研究,指出平落坝构造须二段不同井产出的天然气具有相同或相似的地球化学特征,天然气组成甲烷含量高、干燥系数大、碳同位素值高都表明须二段的天然气成熟度较高,是高成熟阶段的产物,主要来自上三叠统须家河组烃源岩层。但由于聚集时间上的不同,不同井的天然气在烃类指纹特征上仍然存在一些可检测的细微的地球化学差异,根据这些差异,分析了不同井间的连通性。结果显示在构造主体高部位的各井井间连通性较好,构造东南翼部的井连通性也较好,构造西北翼部的井连通性相对差一些,但它们相对于主体构造高部位的井连通性较差,尤其是构造西北翼的平落15井区与其他井区的连通性最差。
Based on the comprehensive analysis of gas composition, compound speci^ic carbon isotopic composition and natural gas enrichment light hydrocarbon fingerprint, natural gases of the Second Member of Xujiahe Formation （T3x2） reservoirs in Pingluoba Structure have the same or similar geochemical characteristics. The high methane content, high dryness coefficient and heavy carbon isotope indicated that the natural gas was a product of high mature stage. They were originated from the Xujiahe Formation of the Upper Triassic. However,due to different accumulation time, some subtle geochemical differences existed in the hydrocarbon fingerprint characteristics. The results showed that the continuity between wells is good for the main structure at the high parts. The continuity between wells is also good for the southeast wing of the structure, but relatively poor in the north-west wing of the structure. However, compared to that for the main structure at the high parts, the continuity between wells is relatively poor both in the southeast and north wings of the structure, especially the Pingluo 15 well in the northwest wing of the structure which has the worst continuity with others.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2014年第3期388-393,共6页
Natural Gas Geoscience
基金
四川省天然气地质重点实验室项目(编号:XJZ051)
四川省重点学科建设项目(编号:SZD0414)联合资助
关键词
须二段天然气
地球化学特征
连通性
平落坝构造
Ts x2 natural gas
Geochemical characteristics
Continuity
Pingluoba Structure
