建南气田长兴组—飞仙关组天然气特征及气源分析  被引量:8

Characteristics of Natural Gas in P_2ch—T_1f Layers in Jiannan Gas Field and Gas Source Correlation

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作  者:张建勇[1,2] 刘文汇[2,3,4] 腾格尔[4] 王小芳 张敬艺[5] 

机构地区:[1]中国石油杭州地质研究院,浙江杭州310023 [2]中国科学院兰州地质研究所,甘肃兰州730000 [3]中国石化石油勘探开发研究院,北京100083 [4]中国石化无锡石油地质研究所,江苏无锡214151 [5]冀东油田勘探开发研究院,河北唐山063004

出  处:《天然气地球科学》2010年第6期1004-1013,共10页Natural Gas Geoscience

基  金:中国科学院西部学子奖学金;中国石油化工集团公司项目(编号:P06006);国家"973"项目(编号:2001CB209102)联合资助

摘  要:建南气田位于开江—梁平海槽和城口—鄂西海槽之间,长兴组在气田北高点发育生物礁,生物骨架发育,岩性为生物礁次生白云岩;飞仙关组南高点气藏发育台内内碎屑——核形石灰岩、鲕粒灰岩、白云岩及细粉晶灰岩。二者储集类型均为裂缝—孔隙型。因此,建南气田为典型的台内礁滩气田。对建南气田的天然气及气源岩特征进行剖析,有助于加强对台内礁滩气藏的认识。通过天然气组分特征及其与碳同位素的关系分析,结合硫化氢含量与白云岩平面分布的关系,认为建南气田长兴组、飞仙关组的干气不受地幔无机成因气影响,主要为油型气及煤型气的混合气,且遭受TSR改造。利用天然气CH4碳同位素与成熟度关系模型,综合分析认为建南气田长兴组、飞仙关组天然气气源主要为二叠系油型烃源岩及煤型烃源岩,而志留系烃源岩只有少量贡献。Jiannan gas field is located in the carbonate open platform between troughs of Kaijiang-Liangping and Chengkou-Exi.P2ch gas reservoir with bio-reef secondary dolomite is distributed in the northern structural height.Lithology of T1f gas reservoir in the southern structural height is oncoids limestone,oolitic limestone,dolomite and aplitic limestone.Both of them have fractured-porous reservoir type.So,Jiannan gas field is subjected to oolitic shoal in inner carbonate platform.The interpretation of gas geochemistry and gas source correlation in Jiannan gas field is required for understanding the oolitic and reef reservoir in inner carbonate platform.According to chemical and carbon isotopic composition of natural gas as well as H2S content and dolomite distribution,we considered that natural gas was of mixing of coal-type and oil-type,and no inorganic gas interfusion existed.The mixed gas would be altered by thermochemical sulfate reduction(TSR).According to pattern of methane carbon isotope values and gas maturity,it is referred that natural gas would be sourced from sapropelic and humic organic matters in Permian,and little contribution of Silurian sapropelic source rocks existed.

关 键 词:建南气田 长兴组 飞仙关组 组分 同位素 气源 

分 类 号:TE132[石油与天然气工程—油气勘探]

 

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