收稿日期: 2005-10-11
修回日期: 2006-02-15
网络出版日期: 2006-04-20
基金资助
国家重点基础研究发展规划项目(编号：2001CB209102)；国家自然科学基金项目(编号 ：40072049)联合资助.
GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF LOW-MATUREOIL-ASSOCI ATED GASES FROM SOUTH REGION OF KONGDIAN,HUANGHUA DEPRESSION
Received date: 2005-10-11
Revised date: 2006-02-15
Online published: 2006-04-20
对黄骅坳陷孔店南区低熟原油及其伴生气进行了饱和烃色-质分析、天然气组分分析和气体组分的碳、氢同位素分析,结果表明:天然气甲、乙、丙烷的组分含量分别在37.99%~68.89%、1.82%~6.01%和0.83%~3.43%之间,甲、乙、丙烷和正丁烷的1δ3C值分别在-45.8‰~-40.8‰-、27.6‰~-25.3‰-、29.2‰~-26.9‰和-28.9‰~-27.7‰之间,甲、乙、丙烷的δD值分别在-254‰~-202‰-、204‰~-180‰-、208‰~-178‰之间;3个样品乙烷、丙烷和正丁烷的1δ3C值均发生了倒转,即1δ3C2>1δ3C3>1δ3CnC4,1个样品甲、乙、丙烷氢同位素组成也发生了倒转,原油生物标志物特征表明其为低成熟油[OEP>1.22,T s/(Ts+Tm)<0.30,20S/(20S+20R)C29甾烷<0.28]。结合该区油气生成的地质背景特征,认为所研究低熟油伴生气为本区低成熟烃源岩(下第三系孔店组二段)所生天然气与成熟烃源岩(上古生界石炭-二叠系)所生天然气的混合气。
王万春;任军虎;张小军;陶明信; . 黄骅坳陷孔店南区低熟油伴生气地球化学特征与成因[J]. 天然气地球科学, 2006 , 17(2) : 153 -156 . DOI: 10.11764/j.issn.1672-1926.2006.02.153
GC-MS analyses were made on saturated hydrocarbons of low-mature oil samples, chemical composition analyses and carbon and hydrogen isotopic composition analy ses were made on natural gas samples of the south region of Kongdian, Huanghua D epression. The components of methane, ethane and propane of natural gases are fr om 37.99 to 68.89%, 1.82 to 6.01% and 0.83% to 3.43% respectively. The carbon is otopic compositions of methane, ethane, propane and normal-butane are from -45. 8‰ to -40.8‰, -27.6‰ to -25.3‰, -29.2‰ to -26.9‰ and from -28.9‰ to - 27.7‰, respectively. The hydrogen isotopic compositions of methane, ethane and propane are from -254‰ to -202‰, -204‰ to -180‰ and from -208‰ to -178 ‰, respectively. δ+{13}C values of methane, ethane, propane and normal-but ane of three samples were all reversed, i.e., δ13C-2>δ13C3>δ13CnC4and δD values of methane, ethane and propane of one samp le were also reversed. The characteristics of biomarker compounds of oils show t hat the oils are low-mature oil [with OEP>1.22, Ts/(Ts+Tm)<0.30, 20S/(20S+20R) C29 stigmastane <0.28]. Combined with the oil and gas formation geologica l background of this region, we propose that the studied low-mature oil associa ted gases are mixed gases originated both from low-mature source rocks (the second sect of Kongdian group of Paleogene System) and from mature source rocks (the Carboniferous to Permian Systems of Upper Palaeozoic Erathem) in this region.
[1]黄第藩，廖前进，徐永昌.未成熟石油成因的初步研究［C］//中国 科学院兰州地质研究所生物、气体地球化学开放研究实验室研究年报(1987).兰州: 甘肃科学技术出版社，1988:1-19.
[2]于俊利.黄骅坳陷未成熟油、低成熟油资源潜力研究及勘探目标优选[D].成 都：成都理工学院，2001:10-19.
[3] 吴永平，于学敏.黄骅坳陷天然气资源潜力与勘探开发对策[J].天然气地球 科学，2003，14(4)：235-239.
[4]刘玉梅，邓泽进，田晓平，等.大港探区天然气成因类型、分布和地球化学特 征［J］.天然气地球科学，2003，14(4):279-282.
[5]张同伟.黄骅坳陷天然气的成因及天然气运移中CH-4碳同位素分馏[D].兰 州：中国科学院兰州地质研究所，1999:14-48.
[6]WANG WANCHUN, LIU WENHUI, XU YONGCHANG, et al. Genetic distinct ion of natural gases from shallow reservoirs in some oil and gas bearing basins of China［J］. Chinese Journal of Geochemistry, 2005, 24(1):90-94.
[7]CHUNG H M, GORMLY J R, SQUIRES R M. Origin of gaseous hydrocarbons in subsurface environments: theoretical considerations of carbon isotope distrib ution［J］. Chemical Geology,1988, 71:97-103.
[8]JAMES A T, BURNS B J. Microbial alteration of subsurface natural ga s accumulations［J］. AAPG Bulletin, 1984, 68:957-960.
[9] KATZ B J, NARIMANOV A, HUSEINZADEH R.Signific- ance of micr obial processes in gases of the South Caspian Basin［J］. Marine and Petroleum G eology, 2002, 19:783-796. ［10］ WANCHUN WANG, LINYE ZHANG, WENHUI LIU, et al. Effects of biodegradat ion on the carbon isotopic composition of natural gas-a case study in the bamian he oil field of the Jiyang depression, eastern China［J］. Geochemical Journal, 2005,39(4):301-309.
[11] 徐永昌.天然气成因理论与应用［M］.北京，科学出版社，1994:84-222.
[12] 徐永昌.天然气地球化学研究及有关问题探讨［J］.天然气地球科学，1999，10(3-4):20-28.
[13] 沈平，徐永昌.中国陆相成因天然气同位素组成特征［J］.地球化学，1991，20(2) ：144-152.
[14] SCHOELL M. Genetic characterization of natural gases［J］. AAPG Bulletin , 1983, 67:2225-2238.
[15] 沈忠民，周光甲，洪志华. 低成熟石油生成环境的生物标志化合物特征［J］. 成 都理工学院学报，1999，26(4)：396-401.
[16]廖前进，于学敏，何咏梅，等.大港探区上古生界煤系烃源岩特征及资源潜力［J］.天然气地球科学，2003，14(4):250-253.
[17] 付立新，周宝仙.黄骅坳陷南区古生界天然气聚集的构造约束条件［J］.天然气地球科学，2003，14(4):254-259.
/
| 〈 |
|
〉 |
甘公网安备 62010202000678号