渭河盆地天然气成因特征及其意义
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摘要
根据渭河盆地地热井气样分析成果,结合地质分析,发现渭河盆地地热井中广泛发现与上古生界煤系地层有关的热解-裂解煤型甲烷气及有机成因CO2气,区域地质和地震成果也佐证了渭河盆地基底存在上古生界地层.因此,前人认为渭河新生代盆地以渭河断裂为界,北部为下古生界,南部为元古界基底,不存在上古生界煤系地层基底的认识是不全面的,渭河盆地至少部分存在上古生界煤系地层基底.渭河盆地上古生界煤系地层可作为烃源岩,这为重新评价渭河盆地的油气地质前景提供了依据.
According to the gas sample from geothermal wells in Weihe Basin,combined with geological analysis results,it is held that there are the pyrolysis-cracking methane gas and the CO2 gas of organic genesis related to upper Paleozoic coal strata.Regional geology and seismic research results confirm that there are upper Paleozoic strata in the base of Weihe Basin.Therefore,the judgment of predecessors is not comprehensive that taking Weihe fault as a dividing line in Cenozoic Weihe Basin,its north is low Paleozoic,its south is proterozoic base,and there is not upper Paleozoic coal strata base in Weihe Basin.The research result in this paper proves that there is a part of upper Paleozoic coal strata base in the basin,and it can be as hydrocarbon source crock,which will be of important significance to the oil and gas geology prospects of Weihe Basin.
According to the gas sample from geothermal wells in Weihe Basin,combined with geological analysis results,it is held that there are the pyrolysis-cracking methane gas and the CO2 gas of organic genesis related to upper Paleozoic coal strata.Regional geology and seismic research results confirm that there are upper Paleozoic strata in the base of Weihe Basin.Therefore,the judgment of predecessors is not comprehensive that taking Weihe fault as a dividing line in Cenozoic Weihe Basin,its north is low Paleozoic,its south is proterozoic base,and there is not upper Paleozoic coal strata base in Weihe Basin.The research result in this paper proves that there is a part of upper Paleozoic coal strata base in the basin,and it can be as hydrocarbon source crock,which will be of important significance to the oil and gas geology prospects of Weihe Basin.
引文
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[15]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.SHI Ya-qin,FENG Xi-jie,DAI Wang-qiang,et al.Distri-bution and structural characteristics of the Xi'an section ofthe weihe fault[J].ACTA Seismologica Sinica,2008,30(6):634-647.
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[2]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.ZHAI Guang-ming,WANG Shen-yan,SHI Xun-zhi,et al.Petroleum Geology of China:Vol 12[M].Beijing:Petrole-um Industry Press,1992:23-55.
[3]张景廉.论石油的无机成因[M].北京:石油工业出版社,2001:1-305.ZHANG Jing-lian.On the Inorganic Origin of Petroleum[M].Beijing:Petroleum Industry Press,2001:1-305.
[4]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,1993,4(2/3):1-40.DAI Jin-xing.Natural gas carbon and hydrogen isotopiccharacter and recognition of the various natural gas[J].Natural Gas Geoscience,1993,4(2/3):1-40.
[5]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.ZHANG Tong-wei,WANG Xian-bin,CHEN Jian-fa,et al.Carbon isotope composition of acidolysis hydrocarbons andits application to gas-source correlation in Ordos Basin,China[J].chinese science bulletin,1996,41(3):242-244.
[6]徐永昌,沈平,刘文汇,等.东部油气区天然气中幔源挥发分的地球化学-Ⅱ.幔源挥发份中的氦,氩及碳化合物[J].中国科学:D辑,1996,26(2):187-192.XU Yong-chang,SHEN Ping,LIU Wen-hui,et al.Geo-chemistry of mantle-derived volatile-Ⅱ.He,Ar and carbon compounds in mantle-derived volatile of the naturalgas in eastern oil and gas region[J].Science in China:Ser D,1996,26(2):187-192.
[7]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.YANG Yu-feng,ZHANG Qiu,HUANG Hai-ping,et al.Abiogenic natural gases and their accumulation model inXujiaweizi area,Songliao Basin,northeast China[J].Earth Science Frontiers,2000,7(4):523-533.
[8]戴金星,宋岩,戴春森,等.中国东部无机成因气及其气藏形成条件[M].北京:科学出版社,1995.DAI Jin-xing,SONG Yan,DAI Chun-sen,et al.Inorganicorigin gas and gas reservoir formation conditions of easternChina[M].Beijing:Science Press,1995.
[9]权新昌.渭河盆地断裂构造研究[J].中国煤田地质,2005,17(3):1-8.QUAN Xin-chang.Weihe Basin faulted structure study[J].Coal Geology of China,2005,17(3):1-8.
[10]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.XUE Hua-feng,ZHU Xing-guo,WANG Run-san,et al.Thediscovery and significance of rich helium natural gas re-source in Xi'an geothermic field[J].Journal of NorthwestUniversity:Natural Science Edition,2004,34(6):751-754.
[11]王景明.渭河地堑断裂构造研究[J].地质论评,1984,30(3):217-223.WANG Jing-ming.A study on the tectonics of the weiheriver graben[J].Geological Review,1984,30(3):217-223.
[12]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.ZHANG Guo-wei,ZHANG Ben-ren,YUAN Xue-cheng,etal.Qinling Orogenic Beit and Continental Dynamics[M].Beijing:Science Press,2001:1-820.
[13]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].长安大学学报:地球科学版,1993,15(4):11-15.MENG Qing-ren,ZHANG Guo-wei,YU Zai-ping.Carbon-iferous tectonic and sedimentary setting of frontalmargin ofQinling subducting plate[J].Journal of Chang'an Univer-sity:Earth Sciences,1993,15(4):11-15.
[14]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.
[15]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.SHI Ya-qin,FENG Xi-jie,DAI Wang-qiang,et al.Distri-bution and structural characteristics of the Xi'an section ofthe weihe fault[J].ACTA Seismologica Sinica,2008,30(6):634-647.
[16]何晓菊,郭亚斌.鄂尔多斯盆地苏里格庙地区上古生界砂岩储层预测技术和效果[J].石油地球物理勘探,2002,37(z1):9-13.HE Xiao-ju,GUO Ya-bin.Reservoir prediction techniqueand effect of sandstone about upper Paleozoic,in Sulige ar-ea,Ordos[J].Oil Geophysical Prospecting,2002,37(z1):9-13.
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