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现代地质 ›› 2016, Vol. 30 ›› Issue (3): 614-626.

• 石油地质学 • 上一篇    下一篇

四川盆地磨溪地区龙王庙组储层沥青的地球化学特征及其意义

郝彬1,胡素云2,黄士鹏2,胡健2,石书缘2,王坤2,梁东星2   

  1. (1. 中国石油勘探开发研究院西北分院,甘肃 兰州 730020;2. 中国石油勘探开发研究院,北京 100083)
  • 出版日期:2016-06-14 发布日期:2016-06-15
  • 作者简介:郝彬,男,工程师,博士,1986年出生,矿产普查与勘探专业,主要从事石油地质综合研究。 Email:330341000@qq.com。
  • 基金资助:

    国家科技重大专项“大型油气田及煤层气开发”(2011ZX05004-001)

Geochemical Characteristics and Its Significance of Reservoir Bitumen of Longwangmiao Formation in Moxi Area, Sichuan Basin

HAO Bin1,HU Suyun2,HUANG Shipeng2,HU Jian2,SHI Shuyuan2,WANG Kun2,LIANG Dongxing2   

  1. (1. Northwest Branch, PetroChina Research Institute of Petroleum Exploration and Development, Lanzhou,Gansu 730020, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083, China)
  • Online:2016-06-14 Published:2016-06-15

摘要:

根据储层中沥青的产状、元素组成、固体碳同位素、饱和烃色谱、生物标志化合物以及芳烃色谱—质谱等,对磨溪地区龙王庙组储层固体沥青的地球化学特征、成因及来源进行了剖析。研究结果表明,其总体上具有低H/C原子比值、高反射率的特征,是古油藏原油经裂解形成的残留物。储层沥青的正构烷烃分布较为完整,碳数在C16—C31范围,没有受到明显的生物降解作用。其可能的烃源岩发育于还原环境,有机质来源于低等水生生物,为海相泥页岩。固体沥青碳同位素值介于-33.1‰~-35.4‰之间,与下寒武统烃源岩干酪根碳同位素具有很好的可比性,同时,其生物标志化合物组成也与下寒武统烃源岩相似,表明其烃源来自于下寒武统筇竹寺组。

关键词: 储层沥青, 地球化学特征, 沥青成因, 龙王庙组, 磨溪地区

Abstract:

Based on the information about reservoir bitumen, such as occurrences, elemental composition, carbon isotope, gas chromatogram for saturated hydrocarbons, the characteristics of biomarkers and aromatic hydrocarbon, this paper analyzes the geochemical characteristics, genesis and source of reservoir bitumen from Longwangmiao Formation in Moxi area. The bitumen is primarily characterized by high reflectance (equivalent Ro>2.0%) and low H/C atomic ratios, suggesting that they are residuals generated from oil cracking, belonging to a pyrobitumen. N-alkane in reservoir bitumen distributes integrally with the carbon number ranging from C16 to C31, without obvious trace of biodegradation. Its possible source rock developed in reducing environment and the bitumen mainly derived from aquatic algae and the source rock might be shale. Its carbon isotope value(-33.1‰~-35.4‰) and the biomarker are very comparable to the kerogen’s in the Lower Cambrian source rock, demonstrating that the bitumen came from Qiongzhusi Formation.

Key words: reservoir bitumen, geochemical characteristics, genesis of bitumen, Longwangmiao Formation, Moxi area

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