收稿日期: 2007-02-21
修回日期: 2007-10-19
网络出版日期: 2008-06-20
基金资助
国家重点基础研究发展计划973课题(编号:2006CB202307)资助.
ORIGIN OF ORDOVICIAN NATURAL GASES IN NO.1 STRUCTURAL BELT OF TAZHONG UPLIFT, TARIM BASIN
Received date: 2007-02-21
Revised date: 2007-10-19
Online published: 2008-06-20
塔中地区的天然气主要聚集于I号构造带附近。研究了塔中Ⅰ号构造带奥陶系天然气的特征,指出该带奥陶系天然气以烃类气为主,干燥系数较高,为0.78~0.99,甲、乙烷碳同位素值分别为-54.4‰~-37.7‰和-42.1‰~-30.8‰,主要是热解成因气;该带西端奥陶系埋深大,构造稳定,天然气保存条件好,因此塔中45井、塔中451井天然气仍存在一定量的生物气。结合塔中下古生界的热演化史和油源对比分析认为,塔中Ⅰ号构造带东段主要聚集了高—过成熟的寒武系烃源岩生成的天然气,其主要来自不同热演化阶段干酪根的裂解,原油裂解气的贡献很小,而塔中Ⅰ号构造西端主要聚集了成熟早期的中—上奥陶统有机质生成的天然气。
郭建军;陈践发;段文标;李程善;师生宝;叶治续 . 塔中Ⅰ号构造带奥陶系天然气成因[J]. 天然气地球科学, 2007 , 18(6) : 793 -797 . DOI: 10.11764/j.issn.1672-1926.2007.06.793
Natural gases of the Tazhong uplift were mainly accumulated along No.1 structural belt. This paper has discussed the character and origin of Ordovician natural gases in the No. 1 structural belt. It shows that all the gases are mainly composed of hydrocarbons, and have high dryness ranging from 0.78 to 0.99. Carbon isotope ratios of methane and ethane range from -54.4‰~-37.7‰ and -42.1‰~-30.8‰, respectively. All the Ordovician gases belong to thermogenic origin except that gases from Wells Tazhong 45 and Tazhong 451 have the character of biogenic origin owing to the good preservation conditions of western Tazhong uplift. Study of Lower Paleozoic strata evolution and oil source correlation suggests that gases from the eastern part of No.1 structural belt originated mainly from higher matured Precambrian source rocks, and gases from western end of No.1 structural belt were mainly from early matured Ordovician source rocks. At the same time, thermogenic gases were mainly produced by primary cracking of kerogen.
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