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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‰,δ13 C2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。
The Lunnan area is one of the important oil and gas producing areas in the Tarim Basin. So far, a number of large and medium-sized oil and gas fields have been discovered. There are many oil and gas layers in the area, and natural gas is found in Ordovician, Carboniferous and Triassic. Geochemical characteristics show that natural gas in Lunnan area is dominated by methane with low content of heavy hydrocarbon gas, while natural gas in Lunnan, Tahe, Jiefangquandong oil and gas fields is mainly humid, while in eastern Lunzhou and Santamu regions Dry gas, and the main body of Triassic and Carboniferous natural gas in Jilak gas field are wet gas and dry gas respectively; the carbon and hydrogen isotope values of methane are -46.7 ‰ ~ -32.0 ‰ and -190 ‰ ~ -127 ‰, respectively, δ13 C2 The main body of the value ranged from -39.6 ‰ to -31.6 ‰, and the main bodies of carbon and hydrogen isotopes of alkanes showed positive sequence features. Due to the mixture of the same type and different source gases, the methane and ethane isotopes partially reversed in some samples. Natural gas in Lunnan area is oil-type gas, of which natural gas in Lunnan Oilfield, Tahe Oilfield and Jiefangquand Oilfield are kerogen pyrolysis gas mixed with part of the crude oil pyrolysis gas; natural gas in the Lungu gas field and the Santar gas field The main natural gas in the Jilak gas field is kerogen pyrolysis gas mixed with part of crude oil pyrolysis gas, while natural gas of carboniferous type is typical crude pyrolysis gas. The natural gas in Lunnan Oilfield and Tahe Oilfield comes from the Cambrian-Lower Ordovician and Middle-Upper Ordovician source rocks, while the natural gas bodies of the Luncun East Gas Field, the Santarum Gas Field, the Jiefangquand Oil Field and the Jilak Gas Field From the Cambrian - Lower Ordovician source rocks.