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Natural gas geochemistry and its origins in Kuqa depression

Science china Earth Sciences 2008年第S1期51卷 174-182页

作者： liu quanyou 1 ,qin shengfei 1 ,{2.,liu wenhui 3 ,zhang dianwei 3 ,zhou qinghua 1 &hu anping 1 1 research institute of petroleum exploration and development,petrochina,Beijing 100083,china 2.Langfang Branch of research institute of petroleum {12. and development,petrochina,Langfang 065007,china 3 {12. and Production research institute,SINOPEC,Beijing 100083,china research institute of {2. exploration and development PetroChina Beijing China Langfang Branch of research institute of {2. exploration and development PetroChina Langfang China exploration and Production research {2. SINOPEC Beijing China

According to gas compositional and carbon isotopic measurement of 114 gas samples from the Kuqa depression,accumulation of the natural gases in the depression is dominated by hydrocarbon gases, with high gas dryness(C1/C1-4)at the middle and northern parts of the depression and low one towards east and west sides and southern *** carbon isotopes of methane and its homologues are relatively enriched in 13 C,and the distributive range ofδ13C 1 ,δ13C 2.andδ13C 3 is-32.―-36‰,-2.‰―-2.‰and-2.‰―-2.‰,*** general,the carbon isotopes of gaseous alkanes become less negative with the increase of carbon ***δ13C CO2.value is less than-10‰in the Kuqa depression,indicating its organogenic *** distributive range of 3 He/ 4 He ratio is within n×10-8 and a decrease in 3 He/ 4 He ratio from north to south in the depression is *** on the geochemical parameters of natural gas above,natural gas in the Kuqa depression is of characteristics of coal-type gas *** possible reasons for the partial reversal of stable carbon isotopes of gaseous alkanes involve the mixing of gases from one common source rock with different thermal maturity or from two separated source rock intervals of similar kerogen type,multistages accumulation of natural gas under high-temperature and over-pressure conditions,and sufficiency and diffusion of natural gas.

关键词： Kuqa depression natural gas stable carbon isotope gas origin

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