川东北飞仙关组-长兴组天然气几个地球化学问题探讨

doi:10.11743/ogg20160307

Abstract

Abstract: Molecular and isotopic composition data of over hundred gas samples were combined with analytical data of source and reservoir rocks to deal with geochemical uncertainties of gases in the Feixianguan-Changxing Formations in Puguang,Yuanba and Tongnanba regions in northeastern Sichuan Basin.Discussion was focused on differentiation of cracking gases from oil and source rocks,causation of carbon isotope reversals in hydrocarbon gases and genetic relationship between CO₂ and H₂S.The results show that oil cracking gases from vuggy reservoirs abundant in solid bitumen in Puguang and Yuanba regions are relatively enriched in propane and have low ln(C₂/C₃) value (<3.0) as a diagnostic signature.In contrast,the source rock cracking gases (sourced from kerogen and bitumen cracking) from fractured reservoirs in Tongnanba region,exhibit a co-varying ln(C₁/C₂) and ln(C₂/C₃),and display higher values (>3.0) of ln(C₂/C₃),distinguishing from typical oil cracking gas.Isotope reversals,resulted possibly from various factors,appear extensively in hydrocarbon gases from the Formations.For the paraffin gas from the Feixianguan Fm of Hebachang gas field in Tongnanba region,the isotope reversal can be attributed to a mixture of post-mature dry gas generated from the Upper Permian Longtan source rocks and gas with slightly higher wetness coming from the Silurian source.Two non-hydrocarbon gas composition modes,namely high H₂S content-low CO₂ content and low H₂S content-high CO₂ content,are recognized in the gases experienced TSR from the Feixianguan-Changxing reservoirs.The relative proportions of these two non-hydrocarbon gases may be associated with overall interaction system of reservoir fluids and rocks.CO₂ with somewhat negative carbon isotope is possibly resulted from hydrocarbon oxidizing in high H₂S reservoirs,whereas,isotopically heavier CO₂ could be mainly formed by chemical degradation of carbonate when it presents in abnormally high amount.

Key words: carbon isotope reversal, carbon dioxide, oil cracking gas, source rock cracking gas, natural gas, northeastern Sichuan Basin

CLC Number:

TE122.1

Zhu Yangming, Sun Linting, Hao Fang, Zou Huayao, Guo Tonglou. Discussion on several geochemical issues of gases in Feixianguan-Changxing Formations in northeastern Sichuan Basin,China[J]. Oil & Gas Geology, 2016, 37(3): 354-362.

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Discussion on several geochemical issues of gases in Feixianguan-Changxing Formations in northeastern Sichuan Basin,China

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