Non-Hydrocarbon Origin of Ordovician Natural Gas in Tazhong of <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:PlaceName w:st="on">Tarim</st1:PlaceName> <st1:PlaceType w:st="on">Basin</st1:PlaceType></st1:place> and Its Implications for Non-Hydrocarbon Accumulation<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

Nonhansi-font-family: 宋体">-Hydrocarbon Origin of Ordovician Natural Gas in Tazhong of Tarim Basin and Its Implications for Nonhansi-font-family: 宋体">-Hydrocarbon Accumulation

详细信息

责任者：Han Jianfa (China University of Geosciences ; Wuhan 430074 ; China) ; Mei Lianfu
刊名：Earth Science Frontiers
出版年：2009
卷期：16(1)
页码：p.314-325
图表：14 illus., 1 table, 25 refs.
issnNo：ISSN1005-2321
isbnNo：CN11-3370/P

摘要

In the north of the Tazhong Area in Tarim Basin, a large condensate pool of reefflat facies and a large karst weathering crustal oil-gas field have been discovered, which demonstrates a breakthrough in the oilgas exploration in carbonate rocks of Ordovician marine facieshansi-font-family: 宋体">. By using organo-geochemical indexes combined with the analysis of the evolution of tectonichansi-font-family: 宋体">-sedimentation some good results have been achieved in the study of the effective hydrocarbon source rock and the accumulation process. But as the exploration depth increases, the complexity of fluid distribution becomes a more and more prominent problem.Through the research on the Ordovician oil-gas accumulation in the north of the Tazhong Area by dating and analysing the natural gas components and their isotopes, the authors could sum up the mode of pool formation in Tazhong as follows: there were three periods of formation and two periods of adjustment; oilhansi-font-family: 宋体">-charging occurred in the early stage and gashansi-font-family: 宋体">-injection occurred in the later stage; oilhansi-font-family: 宋体">-gas accumulated in multihansi-font-family: 宋体">-fashion and oilhansi-font-family: 宋体">-bearing rocks were widehansi-font-family: 宋体">-spread. It is confirmed that the natural gas is mainly the oilhansi-font-family: 宋体">-cracked gas in the Tazhong Area and it is emphasized that the gashansi-font-family: 宋体">-injection in the later stage is the key to the formation of the largehansi-font-family: 宋体">-scale gas field in Tazhong.

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