岩性油气藏 ›› 2015, Vol. 27 ›› Issue (2): 77–82.doi: 10.3969/j.issn.1673-8926.2015.02.012

• 油气地质 • 上一篇    下一篇

滨浅湖相泥质烃源岩中不同赋存状态可溶有机质差异性研究

杨 燕1,2,3,雷天柱1,2,关宝文1,2,3,田春桃1,2,3,吴应琴1,2   

  1. 1. 甘肃省油气资源研究重点实验室,兰州 730000 ; 2. 中国科学院油气资源重点实验室,兰州 730000 ; 3. 中国科学院大学,北京 100049
  • 出版日期:2015-03-03 发布日期:2015-03-03
  • 第一作者:杨燕( 1985- ),女,中国科学院大学在读博士研究生,研究方向为油气地球化学。 地址:( 730000 )甘肃省兰州市城关区东岗西路 382 号中国科学院地质与地球物理研究所兰州油气资源研究中心。 E-mail : yanziyang008@163.com
  • 基金资助:

    国家自然科学基金项目“不同赋存状态有机质的生烃特征和生烃贡献研究”(编号: 41072107 )、“海相高 - 过成熟烃源岩成熟度判识新指标的研究”(编号: 41272147 )和“泥页岩中不同赋存态烃的分离和特征研究”(编号: 41372130 )以及国家油气重大专项“有机粘土复合体生排烃特征及规律研究”(编号: 2011ZX05006-001 )联合资助

Differences of solvable organic matters with different occurrence states in argillaceous source rocks of coastal shallow-lake facie

  Y ANG Yan 1,2,3, L EI Tianzhu 1,2, GUAN Baowen 1,2,3, TIAN Chuntao 1,2,3, WU Yingqin 1,2   

  1. 1. Key Laboratory of Petroleum Resources Research , Gansu Province , Lanzhou 730000 , China ; 2. Key Laboratory of Petroleum Resources Research , Institute of Geology and Geophysics , Chinese Academy of Sciences , Lanzhou 730000 ,China ; 3. University of Chinese Academy of Sciences , Beijing 100049 , China
  • Online:2015-03-03 Published:2015-03-03

摘要:

通过对酒西盆地白垩系中沟组粉砂质泥岩的分步剥离,获取了滨浅湖相泥质烃源岩中不同赋存状态的可溶有机质,并比较了其地球化学特征的异同性。 剥离出的 3 类可溶有机质分别是:在矿物表面附着的可溶有机质,即氯仿沥青A”;与碳酸盐牢固结合或被其包裹的可溶有机质,即氯仿沥青C”;与硅酸盐紧密结合的可溶有机质,即氯仿沥青E”。 研究发现这 3 类可溶有机质无论在含量上还是地球化学参数方面都存在明显不同。分析结果显示,氯仿沥青的含量为氯仿沥青A”>氯仿沥青E”>氯仿沥青C”,而总烃、饱和烃及正构烷烃的含量则是氯仿沥青A”>氯仿沥青C”>氯仿沥青E”。 OEP 值、Pr/Ph 值及∑C22-/∑C22+ 值分析显示,从氯仿沥青A”到氯仿沥青C”再到氯仿沥青E”,可溶有机质的成熟度逐渐增高。 这些研究结果表明:在油气运移过程中,可溶有机质总是优先以物理吸附方式占据大孔隙,然后逐渐进入介孔和微孔;对于结构相似的有机分子,分子量越小,活性越强,相对更会富集在介孔和微孔中,使其中原油品质变好;碳酸盐矿物易富集非烃组分,硅酸盐矿物易富集非烃和沥青质等重质组分。上述研究结果将有助于烃源岩的精细评价和进一步的油气勘探。

关键词: 高精度静校正, 变差函数, 拟合重构, 复杂地表地区

Abstract:

Through stripping silty mudstone of Cretaceous Zhonggou Formation of in Jiuxi Basin step by step, we obtained solvable organic matters with different occurrence states in argillaceous source rocks of coastal shallow-lake facies, and compared the similarities and differences of geochemical characteristics between them. Three kinds of solvable organic matters were stripped, including organic matters adhered on the surface of the minerals, namely chloroform asphalt “A”, solvable organic matters combined solidly or parceled with carbonate, namely chloroform asphalt “C”, and solvable organic matters integrated with silicate closely, namely the chloroform asphalt “E”, respectively. These three kinds of solvable organic matters were obviously different in terms of quantity and geochemical parameters. The analysis results show that chloroform asphalt “A” had the largest number, next is chloroform asphalt “E”, and chloroform asphalt “C” had the least number. However, both the total hydrocarbon and the saturated hydrocarbons and n-alkanes, the number order from most to least was from the chloroform asphalt “A” to chloroform asphalt “C” to chloroform asphalt “E”. OEP value, Pr/Ph ratio and ∑C22-/∑C22+ value show that the maturity of solvable organic matters was gradually increased from chloroform asphalt “A” to chloroform asphalt “C” to chloroform asphalt “E”. These findings suggest that solvable organic matters always prefer to occupy large pore by physical adsorption, then gradually to the meso-porous and microporous in the process of oil and gas migration; and for similar structures of organic molecules, the smaller the weight of the molecular is, the stronger the activity will be and they will accumulate in meso-porous and microporous relatively, and finally makes the crude oil quality better. Carbonate minerals enriched in non-hydrocarbon compositions easily and the silicate minerals concentrate of the non-hydrocarbon easily and heavy constituents, such as asphaltenes simultaneously.These recognitions above will contribute to fine evaluation of hydrocarbon source rocks and further oil and gas exploration.

Key words:  high-precision static correction, variogram, fitting and reconstruction, complex surface areas

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