陕西渭河盆地固市凹陷渭热2井组甲烷气成因及其意义
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摘要
渭河盆地固市凹陷渭热2井组甲烷气的成功点火,再一次引起人们对渭河盆地油气资源前景的关注。渭热2井组及邻区7口井天然气组分、甲烷C同位素等分析指标显示,该区甲烷气具有2种成因类型,浅部气层为新近系张家坡组生物成因气,中深部天然气来自前新生界煤型热解-裂解气;伴生CO2气为有机成因。地质分析认为,渭河盆地固市凹陷具有良好的新生界生物气资源前景,前新生界煤系地层也是渭河盆地重要的潜在烃源岩,表明渭河盆地具有开展进一步油气调查的资源基础。
The successful methane ignitions of Weire 2 well in Gushi Depression of Weihe Basin have drawn people's attention to the prospect of oil and gas resources in Weihe Basin again. Such analytical indices as natural gas components and methane carbon isotope of Weire 2 Well and its adjacent seven wells show that there are two kinds of genesis, i.e., Neogene biogenetic gas of Zhangjiapo Formation in the shallow part and Cenozoic coal pyrolysis gas in the middle and deep part. The indices also show that the associated CO2is of organic origin. Geological analysis suggests that Gushi depression in Weihe Basin has a promising future of Cenozoic biogenetic gas, and pre-Cenozoic coal measures are important potential source rocks in Weihe Basin, which also provide source basis for further oil and gas survey in this area.
The successful methane ignitions of Weire 2 well in Gushi Depression of Weihe Basin have drawn people's attention to the prospect of oil and gas resources in Weihe Basin again. Such analytical indices as natural gas components and methane carbon isotope of Weire 2 Well and its adjacent seven wells show that there are two kinds of genesis, i.e., Neogene biogenetic gas of Zhangjiapo Formation in the shallow part and Cenozoic coal pyrolysis gas in the middle and deep part. The indices also show that the associated CO2is of organic origin. Geological analysis suggests that Gushi depression in Weihe Basin has a promising future of Cenozoic biogenetic gas, and pre-Cenozoic coal measures are important potential source rocks in Weihe Basin, which also provide source basis for further oil and gas survey in this area.
引文
[1]卢进才,魏仙样,李玉宏,等.汾渭盆地富氦天然气成因及成藏条件初探[J].西北地质,2005,(3):82-86.
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[15]戚厚发,关徳师,钱贻伯,等.中国生物气成藏条件[M].北京:石油工业出版社,1997:1-268.
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[18]卢进才,陈高潮,魏仙样,等.内蒙古西部额济纳旗及邻区石炭系—二叠系沉积建造与生烃条件——石炭系—二叠系油气地质条件研究之一[J].地质通报,2011,30(6):811-826.
①国家地质总局第三普查勘探大队.汾渭盆地石油普查阶段地质成果报告.1977.
[2]薛华锋,朱兴国,王润三,等.西安地热田伴生富氦天然气资源的发现及意义[J].西北大学学报(自然科学版),2004,34(6):751-754.
[3]李玉宏,卢进才,李金超,等.渭河盆地天然气成因特征及其意义[J].西安石油大学学报(自然科学版),2011,26(5):11-16.
[4]李玉宏,卢进才,李金超,等.渭河盆地富氦天然气井分布特征与氦气成因[J].吉林大学学报(地球科学版),2011,41(S1):47-53.
[5]陕西省地质矿产局.陕西省区域地质志[M].北京:地质出版社,1989:1-551.
[6]翟光明,王慎言,史训知,等.中国石油地质志(卷12),长庆油田[M].北京:石油工业出版社,1992:23-55.
[7]戴金星.天然气碳氢同位素特征和各类天然气鉴别[J].天然气地球科学,1993,(2/3):1-40.
[8]张同伟,王先彬,陈践发,等.鄂尔多斯盆地酸解烃碳同位素组成与气源对比[J].科学通报,1996,41(3):242-244.
[9]杨玉峰,张秋,黄海平,等.松辽盆地徐家围子断陷无机成因天然气及其成藏模式[J].地学前缘,2000,7(4):523-533.
[10]王景明.渭河地堑断裂构造研究[J].地质论评,1984,30(3):217-223.
[11]张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001:1-820.
[12]孟庆任,张国伟,于在平.秦岭俯冲板块前缘石炭纪构造-沉积环境[J].西安地质学院学报,1993,15(4):11-15.
[13]中国地质调查局地层古生物研究中心.中国各地质时代地层划分与对比[M].北京:地质出版社,2005:235-299.
[14]师亚芹,冯希杰,戴王强,等.渭河断裂西安段的展布及其结构特征[J].地震学报,2008,30(6):634-647.
[15]戚厚发,关徳师,钱贻伯,等.中国生物气成藏条件[M].北京:石油工业出版社,1997:1-268.
[16]王万春,陶明信.地质微生物作用与油气资源[J].地质通报,2005,24(11):1022-1026.
[17]张抗.中国大北方古生界油气勘探新领域[J].地质通报,2011,30(6):803-810.
[18]卢进才,陈高潮,魏仙样,等.内蒙古西部额济纳旗及邻区石炭系—二叠系沉积建造与生烃条件——石炭系—二叠系油气地质条件研究之一[J].地质通报,2011,30(6):811-826.
①国家地质总局第三普查勘探大队.汾渭盆地石油普查阶段地质成果报告.1977.