塔里木盆地轮南地区天然气地球化学特征和成因类型

吴小奇，陶小晚，刘景东

doi:10.11764/j.issn.1672-1926.2014.01.53

天然气地球科学 >

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

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

天然气地球化学

塔里木盆地轮南地区天然气地球化学特征和成因类型

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1.中国石化石油勘探开发研究院无锡石油地质研究所，江苏无锡 214126;
2.中国石油勘探开发研究院，北京 100083

吴小奇(1982-)，男，江苏大丰人，工程师，博士，主要从事天然气地质与地球化学研究. E-mail：xqwu@163.com.

收稿日期: 2013-07-18

修回日期: 2013-09-06

网络出版日期: 2014-01-10

基金资助

国家自然科学基金项目(编号：41302118)资助.

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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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摘要

轮南地区是塔里木盆地重要的油气产区之一，目前已发现了一批大中型油气田。该区含油气层位众多，奥陶系、石炭系和三叠系中均发现了天然气。地球化学特征研究表明，轮南地区天然气以甲烷为主，重烃气含量较低，轮南、塔河、解放渠东等油气田天然气主要为湿气，而轮古东地区、桑塔木地区以干气为主，吉拉克气田三叠系和石炭系天然气主体分别为湿气和干气;甲烷碳\,氢同位素值分别为-46.7‰~-32.0‰和-190‰~-127‰，δ¹³C₂值主体介于-39.6‰~-31.6‰之间，烷烃气碳、氢同位素系列主体表现出正序特征，受同型不同源气混合的影响，部分样品发生了甲烷、乙烷同位素部分倒转。轮南地区天然气为油型气，其中轮南油田、塔河油气田和解放渠东油田天然气主体均为干酪根裂解气，混有部分原油裂解气;而轮古东气田、桑塔木气田天然气则主要为原油裂解气;吉拉克气田三叠系天然气主体为干酪根裂解气，混有部分原油裂解气，而石炭系天然气则为典型原油裂解气。轮南油田和塔河油气田天然气则来源于寒武系—下奥陶统和中上奥陶统烃源岩，而轮古东气田、桑塔木气田、解放渠东油田和吉拉克气田天然气主体来自寒武系—下奥陶统烃源岩。

关键词： 轮南地区; 天然气; 地球化学特征; 成因; 来源

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吴小奇，陶小晚，刘景东 . 塔里木盆地轮南地区天然气地球化学特征和成因类型[J]. 天然气地球科学, 2014 , 25(1) : 53 -61 . DOI: 10.11764/j.issn.1672-1926.2014.01.53

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

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