收稿日期: 2011-03-31
修回日期: 2011-07-15
网络出版日期: 2011-08-10
Genetic Origin of Natural Gas and Its Filling Historyin Dinan Uplift-Wucaiwan of Junggar Basin
Received date: 2011-03-31
Revised date: 2011-07-15
Online published: 2011-08-10
一般认为天然气具有晚期成藏的特征，但通过对准噶尔盆地滴南凸起—五彩湾地区石炭系天然气成藏的研究则得到了不同的认识。研究区的天然气以湿气为主，干燥系数均值为0.92，非烃气体中N2含量均值为3.04％；而天然气的δ13C1均值为-32.12‰，明显偏高，反映出天然气成熟度已经处于干气阶段。通过对研究区天然气成因与成藏分析，认为该地区具有“早期聚集、晚期保存”的天然气成藏过程，总体来说该地区经历了海西晚期、印支晚期和燕山中期的多期油气充注和成藏，但燕山中期是该地区成藏的关键时期，并且该时期主要聚集的是石炭系烃源岩在RO值达到0.8％～1.2％之后生成的天然气，这也是造成该地区天然气组分碳同位素值偏高的主要原因。
赵孟军, 王绪龙, 达江, 向宝力, 宋岩, 秦胜飞 . 准噶尔盆地滴南凸起—五彩湾地区天然气成因与成藏过程分析[J]. 天然气地球科学, 2011 , 22(4) : 595 -601 . DOI: 10.11764/j.issn.1672-1926.2011.04.595
Generally,the time of natural gas accumulation is late.But the filling history of the Carboniferous natural gas in the Dinan uplift\|Wucaiwan of Junggar basin gives a special sample.Natural gas has low dryness coefficient of 0.92 and N2 content of 3.04%,but the δ13C1 value of -32.12‰ indicates that natural gas would be at the highly mature stage.By means of genetic origin of natural gas and recovery of filling history,we consider that natural gas was formed at early stage but accumulate at late stage in the Dinan uplift\|Wucaiwan of Junggar basin.There are three stages of gas accumulation,including late Hercynian,late Indo\|Chinese and middle Yanshan,but the Yanshan is the main stage of gas accumulation.At Yanshan Era,natural gas was derived from the Carboniferous source rock with thermal maturity of 0.8％-1.2％RO,causing methane enriched in 13C.
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