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
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.
GUO Jian-jun ;CHEN Jian-fa ;DUAN Wen-biao ;LI Cheng-shan ;SHI Sheng-bao ;YE Zhi-xu . ORIGIN OF ORDOVICIAN NATURAL GASES IN NO.1 STRUCTURAL BELT OF TAZHONG UPLIFT, TARIM BASIN[J]. Natural Gas Geoscience, 2007 , 18(6) : 793 -797 . DOI: 10.11764/j.issn.1672-1926.2007.06.793
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