标题:
银额盆地哈日凹陷哈参1井天然气地球化学特征及气源对比Geochemical Characteristics and Origin of Natural Gas of Well Hacan 1 in Hari Sag, Yingen-Ejinaqi Basin
作者:
陈治军, 赵春晨, 王小多, 刘护创
关键字:
气源对比, 地球化学特征, 天然气, 哈参1井, 哈日凹陷, 银额盆地Gas Source Correlation, Geochemical Characteristics, Natural Gas, Well Hacan 1, Hari Sag, Yingen-Ejinaqi Basin
期刊名称:
《Journal of Oil and Gas Technology》, Vol.39 No.6, 2017-12-15
摘要:
哈日凹陷哈参1井巴音戈壁组试气获得突破对银额盆地意义重大，预示着盆地中部具有一定的油气勘探潜力。但天然气是来自于中生界还是古生界存在争议，气源的不确定性严重影响了对气藏的认识，制约了对油气藏的预测和勘探方向的选择。主要开展哈参1井天然气地球化学特征和气源对比研究，结果表明：哈参1井巴音戈壁组天然气干燥系数为0.81~0.86，属于湿气，成因类型为油型气，热演化程度为高成熟天然气。碳同位素和生物标志化合物对比结果表明，哈参1井巴音戈壁组天然气伴生凝析油特征与巴音戈壁组烃源岩相似程度高，气藏的气源岩推测为巴音戈壁组烃源岩。虽然凝析油的甾烷特征与二叠系露头烃源岩有着相似性，但其他生物标志化合物特征表现出明显的差别，且二叠系未钻遇有效烃源岩，其气源贡献还有待于进一步研究。
It was greatly significant breakthrough of natural gas reservoir in Bayingebi formation of Well Hacan 1, Hari Sag, Yingen-Ejinaqi Basin, which heralded a certain oil and gas exploration potential in the central of basin. However, there was a big controversy for the source of gas between Mesozoic and Paleozoic. This uncertainty of gas source severely affected the understanding of gas reservoir, which constrained the prediction of gas reservoir and the selection of exploration direction as well. This paper mainly concentrated on the research of natural gas geochemistry and gas source correlation analysis. Our results revealed that the drying coefficient of natural gas was between 0.81 and 0.86. It belonged to wet gas, which was oil type gas on the genetic type and high matured gas on the degree of thermal evolution. To contrast the characteristics of carbon isotope and biomarker compounds, there was a high degree of similarity between hydrocarbon source rock and condensate oil in Bayingebi formation. Hence the source rock of the gas should be from Bayingebi formation. Although sterane characteristics of condensate oil showed a certain similarity with outcrop hydrocarbon source rock in Permian, they had obvious differences in other biomarker compounds. Moreover, there was no effective hydrocarbon source rock in Permian as drilling revealed. Thus the gas source contribution of Permian source rocks remained to be studied further.