塔里木盆地塔北隆起天然气轻烃地球化学特征及应用

通过分析塔里木盆地塔北隆起天然气中轻烃组分的特征，认为塔北隆起油型气、煤型气和混合型3类天然气藏中轻烃的分布特征具有明显的差异。分布在英买力低凸起和哈拉哈塘凹陷的油型气，其轻烃组分中正构烷烃和正庚烷的相对含量较高;分布在轮台断隆的煤型气，其轻烃组分中异构烷烃、甲基环己烷和苯的相对含量较高;分布在东河塘断裂带附近的混源气，其轻烃组分中苯、甲基环己烷和正庚烷的相对含量均较高。根据甲烷碳同位素和轻烃成熟度参数估算的成熟度特征，认为提尔根、羊塔克断裂带和英买32潜山构造带天然气至少应存在两期成藏;英买7、东河塘断裂带和英买2潜山构造带天然气为一期成藏。天然气中轻烃参数显示，轮台断隆西段的天然气具有自库车坳陷向塔北前缘隆起带运移充注的特征。

G eochem ical characteristics of light hydrocarbons in natural gas in the TabeiUplift of the Tarim Basin and their implications

Based on the analysis of light hydrocarbons in natural gas in the TabeiUplift of the Tarim Basin，obˉvious differences are found in the distribution characteristics of lighthydrocarbon in3types ofnatural gas:petroliˉferous gas，coalˉrelated gas and m ixed gas.For petroliferous gas，which is distributed in the Yingmaili low uplift and the Halahatang sag，relative contents of nˉalkane and nˉheptane are high;for coalˉrelated gas，which is disˉtributed in the Luntai fault uplift，relative contents of isoparaffin，methylcyclohexane and benzene are high;for m ixed gas，which is distributed in the Donghetang fault belt，relative contents of benzene，methylclohexane and nˉheptane are high.According to gasmaturity estimated using parameters such as carbon isotope ofmethane and the maturity of light hydrocarbon，we believe that（1）there were at least twoˉphases of poolˉform ing for natural gas in the Ti’ergen faultbelt，theYangtake faultbelt and theYingmai32buried hill structural zone;（2）natural gas in the Yingmai7fault belt，the Donghetang fault belt and the Yingmai2buried hill structural zone expeˉrienced oneˉphased poolˉform ing process;（3）parameters of light hydrocarbon reveal that natural gas in the western part of the Luntai fault uplift has features ofm igrating and charging from the Kuqa depression to the Tabei forebulge belt.