塔里木盆地阿克1井天然气成藏地球化学分析

GEOCHEMICAL ANALYSES ON THE NATURAL GAS FORMATION OF WELL AK1 IN THE TARIM BASIN

该文在对塔里木盆地阿克1井天然气进行多种手段分析的同时,引入热压模拟的方法对多种类型的烃源岩进行了系列模拟产气实验,并将模拟气与阿克1井天然气进行对比。综合分析后认为,本井天然气来源于本区石炭—二叠系过成熟阶段生成的干气。在有机包裹体分析和自生伊利石测年的基础上,结合沉积与构造演化分析,作者指出本井天然气为晚期成藏、阶段聚气的产物,主要聚集了源岩在晚第三纪末—第四纪期间生成的气体。该研究成果对塔西南地区今后的勘探具有重要的指导价值。

The natural gas from well AK1 was analyzed by multipe analytical methods in this paper. At the same time, the thermal-pressure simulation method was introduced to perform a series of gas-producing simulation experiments on many kinds of source rocks, and the simulated gas was compared with the natural gas from well AK1. The results revealed that the natural gas of well AK1 originated from dry gas formed in the postmature stage of the Carboniferous-Permian in the study area. Based on the organic inclusion analysis and the authigenic illite dating and combined with sedimentary and tectonic evolution analy-sis, the authors suggested that the natural gas of well AK1 was a result of late pool formation and staged gas accumulation and mainly congregated gas formed during the end of the Late Tertiary and the Quaternary. This result will be of important directive value for the further exploration of southwest Tarim area.