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| 铀对I型低熟烃源岩生烃演化的影响 |
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毛光周口1,2,3,4,刘池洋口1,2,刘宝泉5,张东东1,2,邱欣卫1,2,王建强1,2
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(1.西北大学大陆动力学国家重点实验室，陕西西安710069;2.西北大学含油气盆地研究所，陕西西安710069;3.山东省沉积成矿作用与沉积矿产重点实验室，山东青岛266590;4.山东科技大学地质科学与工程学院，山东青岛266590 ;5.中国石油华北油田分公司勘探开发研究院，河北任立062552)
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| 摘要: |
| 在I型低熟烃源岩中加人砂岩型铀矿石的条件下进行生烃模拟实验,对比无铀-加铀样品生烃模拟实验产物 的相关参数，探讨油气生成过程中无机铀所起的作用。结果表明:铀的存在促使长链烃类在400尤后裂解成低相对 分子质量短链烃，烃类相对分子质置降低，向干气演化，C02和H2大量生成，且铀的存在使得这一变化的温度点提 前50 X:;铀可以促进总油生成高峰的提前到来;350 t为铀使烯烃产量变化的转折温度点，烯烃开始向烷烃转变;铀 的存在能提卨模拟实验中生成的烯烃的异构化程度，并在整体上使生成的烯烃分子在晶格中排得更加紧密;加铀的 烃源岩样品的生烃模拟实验产物在族组成、饱和烃气相色谱、生物标志化合物等方面表现出更加成熟的特征,铀可 以使有机质的成熟度提高，有利于低熟烃源岩早期生成低熟油气,使铀的存在成为未熟-低熟油气形成的可能无机 促进因素之一，这种提前生成的少量油气可以使所在储层变为亲油性，为后期大规模生成的油气运移成藏提供有利 的条件，使得即使是致密的储层,也能形成大规模的T业油气藏。 |
| 关键词: 铀 烃源岩 低熟油气 成熟度 有机-无机相互作用 地质催化作用 生烃模拟 |
| DOI：10.3969/j.issn.1673-5005.2012.02.030 |
| 分类号:P599 |
| 基金项目:西北大学大陆动力学国家重点实验室科技部令项(BJ081334);闰家自然科学基金项目(90814005);闻家科技重大专项谍题 (2008ZX05023-00I-002 闻家重点基础研究发展计划(973)项目(2003CB2I4600 山东科技大学“春蕾计划”项目 (2010AZZ009) |
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| Effects of uranium on hydrocarbon generation of low-mature hydrocarbon source rocks containing kerogen type I |
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MAO Guang-zhou1,2,3,4,LIU Chi-yang1,2,LIU Bao-quan5,ZHANG Dong-dong1,2,QIU Xin-wei1,2,WANG Jian-qiang1,2
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(1.State Key Laboratory of Continental Dynamics in Northwest Universityy Xi'an 710069, China;2. Institute of Petroliferous Basin of Northwest University f Xi'an 710069, China ;3. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Qingdao 266590, China;4. College of Geological Sciences & Engineering, Shandong University of Science and. Technology，Qingdao 266590, China;5. Expbration and Development Research Institute of Huabei Oilfield Company，PtroChina’ Renqiu 062552, China)
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| Abstract: |
| Hydrocarbon-generating simulation experiment was proceeded using hydrocarbon source rock containing kerogen type I with uranium ( sandstone uranium ore) added. The effects of uranium on the hydrocaiix>n generation by relevant parameters of simulation experiment products were studied oomparsdively. The results show that uranium can facilitate the long-chain hydrocarbons cracking into low molecular weight hydrocarbons at lhe temperature above 400 t, as a result the molecular weight of hydrocarbons products is lowered. The degree of dry gas increases，while the C02 and H2 are largely generated, and the uranium lowered the variation temperature for about 50 X.. Uranium can lower the peak temperature of total liquid hydrocarbons generating. 350 X. is the transition temperature of alkenes yield，above which alkenes changes into alkanes. Uranium can enhance the isomerization of alkene produced in the simulating experiment, and make the molecule lattice of al-kene member arraying more closely. It's mature of products in the characteristic parameters of group composition, saturated |
| Key words: uranium source rm:ks immature hydrocarbons maturity organic -inorganic interactions geology catalysis hydrocarbon generation simulation |
