Geochemical Characteristics and Genetic Types ofNatural Gas from Lunnan Area in Tarim Basin

WU Xiao-qi，TAO Xiao-wan，LIU Jing-dong

doi:10.11764/j.issn.1672-1926.2014.01.53

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 1: 53 - 61

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.01.53

Geochemical Characteristics and Genetic Types ofNatural Gas from Lunnan Area in Tarim Basin

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1.Wuxi Research Institute of Petroleum Geology,Petroleum Exploration and Production Research Institute,SINOPEC,Wuxi 214126,China;
2.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China

Received date: 2013-07-18

Revised date: 2013-09-06

Online published: 2014-01-10

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Abstract

Lunnan area is one of the important oil and gas producing units in the Tarim Basin,and a series of oil and gas fields have been discovered.The oil and gas in the Lunnan area are reservoired in several strata,and natural gas has been found in Ordovician,Carboniferous and Triassic reservoirs.The study on geochemical characteristics of natural gas indicates that the gas in the Lunnan area is dominated by methane with a minor contribution of heavier hydrocarbons.The gases from Lunnan,Tahe and Jiefangqudong fields are wet,whereas those from Lungudong and Sangtamu fields are dry,and gases from Triassic and Carboniferous reservoirs in Jilake Field are wet and dry,respectively.The carbon and hydrogen isotopic values of methane range from -46.7‰ to -32.0‰ and from -190‰ to -127‰,respectively,and the carbon isotopic values of ethane mainly range from -39.6‰ to -31.6‰.The alkane gases generally display positive carbon and hydrogen isotopic series,and several samples display partial reversal between methane and ethane due to the influence by mixing of gases from different source with the same organic type.Gases in Lunnan area are typically oil-associated,and those from Lunnan,Tahe and Jiefangqudong fields are mainly primary kerogen cracking gas with some minor contribution of oil-cracking gas,whereas those from Lungudong and Sangtamu Fields are generally from secondary oil cracking.In Jilake Field,the Triassic-reservoired gas is mainly kerogen-cracking assisted by oil-cracking gas,whereas the Carboniferous-reservoired gas is typically from oil cracking.The gases from Lunnan and Tahe Fields were derived from both Cambrian-Lower Ordovician and Middle-Upper Ordovician source rocks,and those from Lungudong,Sangtamu,Jiefangqudong and Jilake were mainly derived from Cambrian-Lower Ordovician source rocks.

Key words： Lunnan area; Natural gas; Geochemical characteristics; Origin; Source

Cite this article

WU Xiao-qi，TAO Xiao-wan，LIU Jing-dong . Geochemical Characteristics and Genetic Types ofNatural Gas from Lunnan Area in Tarim Basin[J]. Natural Gas Geoscience, 2014 , 25(1) : 53 -61 . DOI: 10.11764/j.issn.1672-1926.2014.01.53

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