中国大陆科学钻探主孔0～2000米的N_2、Ar和He流体地球化学
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摘要
CCSD主孔泥浆中He的含量在0.0006-0.029％之间变化,平均含量是9.7×10-4％,N2的含量在75.5-88.7％之间变化,平均含量是81.10％,Ar的含量在0.126-1.13％之间变化,平均含量是0.94％,N2/Ar比值在71.11-622.22之间变化,平均值为86.72。依据泥浆解吸气体中的N2、Ar、He浓度和N2/Ar比值与井深关系曲线,300m以下的主孔剖面可以分为6个区段:300-469m,469.5-891 m,891.5-1174 m,1203.5-1492 m,1520-1773 m,1773.5-2045 m。300-469m和1520-1773 m区段未见明显的外来流体加入,469.5-891 m、891.5-1174 m、1203.5-1492 m和1773.5-2045 m泥浆流体中可能有地下流体异常存在。根据N2/Ar比值的变化,首次报道了大陆科学钻钻进过程中存在N2、Ar异常。泥浆中N2、Ar和He含量的地球化学特征表明,泥浆的主要成分是富Ar的浅部循环大气降水(大气混染泥浆),大气N2、Ar的带入占泥浆气体的主要部分。从300 m到2045 m的钻进过程中,由于深部地震-构造作用,可能导致多种来源地下流体加入。
N2, Ar and He was found in the mud of Chinese Continental Scientific Drilling (CCSD) hole from 300 - 2045 m. The Nitrogen varies between 75.5% and 88. 7% , Ar varies between 0. 126% and 1. 13% , and He between 0. 0006 and 0. 029%. The N2/Ar ratio is ranged from 71.11 to 622. 22. The geochemical characters of N2, Ar and He indicate that the major composition of the mud is result from air containmination, but a part of extraneous fluids are added in the muds. The relationship between the concentrations of N2 , Ar, He and ratio of N2/Ar and the depth of CCSD well, suggests that there are six periods of fluid below 300m. They are 300-469m, 469. 5-891 m, 891. 5-1174 m, 1203. 5 - 1492 m, 1520 - 1773 m , 1773. 5 - 2045 m. We found that extraneous fluids were added into the piolet well mud during the periods of 469. 5 - 891 m、891. 5 - 1174 m,1203. 5 - 1492 m and 1773. 5 -2045 m, but no extra fluids were added during the periods of 300-469m and 1520 - 1773 m. It' s assumed that N2, Ar and He generated from different sources(crust fluid 、natural gas, and magma fluid ) migrate into the CCSD piolet well.
N2, Ar and He was found in the mud of Chinese Continental Scientific Drilling (CCSD) hole from 300 - 2045 m. The Nitrogen varies between 75.5% and 88. 7% , Ar varies between 0. 126% and 1. 13% , and He between 0. 0006 and 0. 029%. The N2/Ar ratio is ranged from 71.11 to 622. 22. The geochemical characters of N2, Ar and He indicate that the major composition of the mud is result from air containmination, but a part of extraneous fluids are added in the muds. The relationship between the concentrations of N2 , Ar, He and ratio of N2/Ar and the depth of CCSD well, suggests that there are six periods of fluid below 300m. They are 300-469m, 469. 5-891 m, 891. 5-1174 m, 1203. 5 - 1492 m, 1520 - 1773 m , 1773. 5 - 2045 m. We found that extraneous fluids were added into the piolet well mud during the periods of 469. 5 - 891 m、891. 5 - 1174 m,1203. 5 - 1492 m and 1773. 5 -2045 m, but no extra fluids were added during the periods of 300-469m and 1520 - 1773 m. It' s assumed that N2, Ar and He generated from different sources(crust fluid 、natural gas, and magma fluid ) migrate into the CCSD piolet well.
引文
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Zimmer M and Erizinger J. 1995． On the geochemistry of gases in fonnation and drilling fluids-result from the KTB. Sci. Drill. , 5 : 101-109
刘德良,陶士振.2000． 郯庐断裂带及邻区地热场特征、温泉形成因素及气体组成.天然气工业,20(6) :42-47
上官志冠,都吉夔,臧伟,王基华,孔令昌,高松升.1998． 郯庐断裂及胶辽断块区地热流体地球化学.中国科学(D辑),28(1) :24-29
杨方之,王金渝,潘庆斌.1991． 苏北黄桥地区上第三系富He天然气成因探讨.石油与天然气地质,12(3) :340-345
Liu DL, Tao SZ. 2000． Geothermal field characteristics of Tanlu faultzone and its neighbouring regions, thermal spring genesis and itsgascomposition. Natural Gas Industry, 20(6) : 42-47(in Chinesewith English abstract)
Moller P, Weise S M, Althaus E et al. 1997． Paleofluids and recent fluids in the upper continental crust: result from the German continental deep drilling program ( KTB). J. Geophy. Res. , 102 (B8) :18233-18254
Norman D I, Musgrave J. 1994． N2-Ar-He compositions in fluid inclusions: indicators of fluid source. Geochim. Coschim. Acta, 58:1119-1131
Shangguan ZG, Du JK, Zhang W et al. 1998． Geothermal fluid geochemistry characteristics of Tanlu fault zone and Jiao-Liao fault block. Science in China (Series D) , 28(1) :24-29(in Chinese)
Yang FZ, Wang JY, Pan QB. 1991． Discussion on origin of upper neogene helium-rich gases in Huangqiao, North Jiangsu. Oil and Gas Geology, 12(3) : 340-345(in Chinese with English abstract)
Zimmer M and Erizinger J. 1995． On the geochemistry of gases in fonnation and drilling fluids-result from the KTB. Sci. Drill. , 5 : 101-109
刘德良,陶士振.2000． 郯庐断裂带及邻区地热场特征、温泉形成因素及气体组成.天然气工业,20(6) :42-47
上官志冠,都吉夔,臧伟,王基华,孔令昌,高松升.1998． 郯庐断裂及胶辽断块区地热流体地球化学.中国科学(D辑),28(1) :24-29
杨方之,王金渝,潘庆斌.1991． 苏北黄桥地区上第三系富He天然气成因探讨.石油与天然气地质,12(3) :340-345
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