收稿日期: 2007-02-21
修回日期: 2007-10-19
网络出版日期: 2008-06-20
基金资助
国家重点基础研究发展计划973课题（编号：2006CB202307）资助.
ORIGIN OF ORDOVICIAN NATURAL GASES IN NO.1 STRUCTURAL BELT OF TAZHONG UPLIFT, TARIM BASIN
Received date: 2007-02-21
Revised date: 2007-10-19
Online published: 2008-06-20
塔中地区的天然气主要聚集于I号构造带附近。研究了塔中Ⅰ号构造带奥陶系天然气的特征，指出该带奥陶系天然气以烃类气为主，干燥系数较高，为0.78~0.99，甲、乙烷碳同位素值分别为-54.4‰~-37.7‰和-42.1‰~-30.8‰，主要是热解成因气；该带西端奥陶系埋深大，构造稳定，天然气保存条件好，因此塔中45井、塔中451井天然气仍存在一定量的生物气。结合塔中下古生界的热演化史和油源对比分析认为，塔中Ⅰ号构造带东段主要聚集了高—过成熟的寒武系烃源岩生成的天然气，其主要来自不同热演化阶段干酪根的裂解，原油裂解气的贡献很小,而塔中Ⅰ号构造西端主要聚集了成熟早期的中—上奥陶统有机质生成的天然气。
郭建军;陈践发;段文标;李程善;师生宝;叶治续 . 塔中Ⅰ号构造带奥陶系天然气成因[J]. 天然气地球科学, 2007 , 18(6) : 793 -797 . DOI: 10.11764/j.issn.1672-1926.2007.06.793
Natural gases of the Tazhong uplift were mainly accumulated along No.1 structural belt. This paper has discussed the character and origin of Ordovician natural gases in the No. 1 structural belt. It shows that all the gases are mainly composed of hydrocarbons, and have high dryness ranging from 0.78 to 0.99. Carbon isotope ratios of methane and ethane range from -54.4‰~-37.7‰ and -42.1‰~-30.8‰, respectively. All the Ordovician gases belong to thermogenic origin except that gases from Wells Tazhong 45 and Tazhong 451 have the character of biogenic origin owing to the good preservation conditions of western Tazhong uplift. Study of Lower Paleozoic strata evolution and oil source correlation suggests that gases from the eastern part of No.1 structural belt originated mainly from higher matured Precambrian source rocks, and gases from western end of No.1 structural belt were mainly from early matured Ordovician source rocks. At the same time, thermogenic gases were mainly produced by primary cracking of kerogen.
[1] 周新源，王招明，杨海军，等．塔中奥陶系大型凝析气田的勘探和发现［J］.海相油气地质，2006，11（1）：45-51.
［2］周新源，王清华，杨文静，等.塔里木盆地天然气资源及勘探方向［J］.天然气地球科学，2005，16（1）：7-12.
［3］韩剑发, 梅廉夫, 杨海军, 等.塔里木盆地塔中地区奥陶系碳酸盐岩礁滩复合体油气来源与运聚成藏研究[J].天然气地球科学，2007，18（3）：426-435.
［4］袁剑英.中国西北地区主要油气勘探领域勘探难题与技术对策[J].天然气地球科学，2006，17（5）：601-605.
［5］陈践发，徐永昌，黄第藩．塔里木盆地东部地区天然气地球化学特征及成因探讨(之二)[J]．沉积学报，2001，19（1）：141-144．
［6］陈践发，徐永昌，黄第藩．塔里木盆地东部地区天然气地球化学特征及成因探讨(之一)[J]．沉积学报，2000，18（4）：606-610．
［7］赵孟军，卢双舫，王庭栋，等．塔里木盆地天然气成藏与勘探［M］.北京：石油工业出版社，2003．
［8］Schoell M. Genetic characterization of natural gases[J].AAPG Bull, 1983, 67(12): 2225-2238.
［9］James A T. Correlation of natural gases by use of carbon isotopic distribution between hydrocarbon compinents[J].AAPG Bull, 1983, 67(7):1176-1191.
［10］James A T. Correlation of reservoired gases using the carbon isotopic compositions of wet gas components[J].AAPG Bull, 1990, 74(9):1441-1458.
［11］Rooney M A, Claypool G E, Chung H M. Modeling thermogenic gas generation using carbon isotope ratios of natural gas hydrocarbon［J].Chemical Geology, 1995, 126:219-232.
［12］Huang Difan, Liu Baoquan, Wang Tingdong,et al.Genetic type and maturity of Lower Paleozoic marine hydrocarbon gases in the eastern Tarim Basin[J].Chemical Geology, 1999, 162: 65-77.
［13］Chen Jianfa, Xu Yongchang, Huang Difan. Geochemical characteristics and origin of natural gas in Tarim Basin[J].AAPG Bull, 2000, 84(5):591-606.
［14］王飞宇，张水昌，张宝民，等．塔里木盆地寒武系海相烃源岩有机成熟度及演化史［J］.地球化学，2003，32（5）：461-468．
［15］Behar F, Kressmann S, Rudkiewicz J L,et al.Experimental simulation in a confined system and kinetic modeling of kerogen and oil cracking[J].Organic Geochemistry, 19(1-3): 173-189.
［16］Berner U, Faber E, Scheeder G, et al.Primary cracking of algal and landplant kerogens: kinetic models of isotopic variations in methane, ethane and propane[J].Chemical Geology, 1995, 126:233-245.
［17］Tian H, Xiao X M, Wilkins R W T, et al.Gas sources of the YN2 gas pool in the Tarim Basin-Evidence from gas generation and methane carbon isotope fractionation kinetics of source rocks and crude oils[J].Marine and Petroleum Geology, 2007, 24 (1): 29-41.
［18］Horsfield B, Schenk H J, Mills N, et al.An investigation of the in-reservoir conversion of oil to gas: compositional and kinetic findings from closed-system programmed-temperature pyrolysis[J].Organic Geochemistry, 1992, 19(1/2/3): 191-204.
［19］Lorant F, Prinzhofer A, Behar F, et al.Carbon isotopic and molecular constraints on the formation and the expulsion of thermogenic hydrocarbon gases[J].Chemical geology, 1998, 147: 249-264.
［20］Prinzhofer A A, Huc A Y. Genetic and post-genetic molecular and isotopic fractionations in natural gases[J].Chemical Geology, 1995, 126(3/4):281-290.
［21］Prinzhofer A, Mello M R, Takaki T. Geochemical Characterization of Natural Gas A Physical Multivariable Approach and its Applications in Maturity and Migration Estimates[J].AAPG Bull, 2000, 84(8):1152-1172.
［22］胡国艺，肖中尧，罗霞，等．两种裂解气中轻烃组成差异性及其应用［J］.天然气工业，2005，25（9）：23-25．
/
| 〈 |
|
〉 |
甘公网安备 62010202000678号