论文部分内容阅读
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。
Comparing the characteristics of natural gas components, carbon isotopes and hydrocarbon fingerprinting of natural gas, it is pointed out that the natural gas produced by different wells in Pinglu Dam has the same or similar geochemical characteristics, and the gas composition of natural gas is high , Large drying coefficient and high carbon isotope value all indicate that the mature gas of the Second Member of the Second Member is higher in maturity and is derived from the high maturity stage mainly from the source rocks of the Upper Triassic Xujiahe Formation. However, due to the different accumulation time, there are still some detectable subtle geochemical differences in the hydrocarbon fingerprints of different wells. According to these differences, the connectivity between different wells is analyzed. The results show that well connectivity between the wells in the high part of the main body is good, well connectivity in the southeast wing is good, and well connectivity in the northwest wing part is relatively poor. However, Well connectivity is poor, especially the Pingliao 15 zone, which forms the northwestern wing, has the worst connectivity with other wells.