地学前缘 ›› 2013, Vol. 20 ›› Issue (1): 64-71.

• 论文 • 上一篇    下一篇

论川东北地区发现的高密度甲烷包裹体类型与油裂解气和页岩气勘探评价

刘德汉,肖贤明,田辉,王一刚,汪泽成,闵育顺   

  1. 1 中国科学院 广州地球化学研究所 有机地球化学国家重点实验室, 广东 广州 510640
    2 中国石油 四川分公司, 四川 成都 610081
    3 中国石油勘探开发研究院, 北京 100083
  • 收稿日期:2012-09-10 修回日期:2012-12-04 出版日期:2013-01-15 发布日期:2013-01-15
  • 作者简介:刘德汉(1935—),男,研究员,主要从事石油天然气地质地球化学、有机岩石学和流体包裹体研究工作。E-mail:liudh@gig.ac.cn
  • 基金资助:

    国家重点基础研究发展计划“973”项目(2012CB214705);国家自然科学基金项目(41072095);国家油气专项(2011ZX05008-002-40)

Multiple types of high density methane inclusions and their relationships with exploration and assessment of oilcracked gas and shale gas discovered in NE Sichuan.

  • Received:2012-09-10 Revised:2012-12-04 Online:2013-01-15 Published:2013-01-15

摘要:

据甲烷包裹体的产出特征和显微激光拉曼分析研究,近年来在川东北地区先后发现了多种类型的高密度甲烷包裹体,揭示了油气藏和石油包裹体的高温热演化作用的重要信息:普光气田三叠系碳酸盐和碎屑岩储层中含焦沥青的高密度甲烷包裹体分别反映了早期油藏阶段矿物捕获的石油包裹体经后期高温极端裂解的成因;普光5井碳酸盐储层中含H2S而不含焦沥青的高密度甲烷包裹体,反映了古油藏高温裂解阶段新生方解石捕获了储层中富含CH4也有“TSR”成因的H2S流体的信息;五科一井下志留统黑色硅质岩石英中发现的高密度甲烷包裹体和少量含轻烃包裹体,反映了本区富有机质的下志留统高演化程度的黑色页岩在地质历史中存在高压甲烷和轻烃产出的证据。以上各种高密度甲烷包裹体成因机理和形成的高温度高压力条件,为川东北地区古油藏裂解气和志留系“页岩气”的勘探评价提供了科学依据。

关键词: 高密度甲烷包裹体, 显微激光拉曼分析, 油裂解气, 页岩气

Abstract:

worIn recent years, multiple types of high density methane inclusions have been discovered in northeast Sichuan. The geological occurrences of methane inclusions were investigated, and their microscopic Raman spectra were analyzed. Pyrobitumenbearing high density methane inclusions occur in Triassic carbonate and clastic reservoir rocks in Puguang gas field,and were postulated resulting from later stage high temperature cracking of oil inclusions trapped at early stage of oil reservoir formation; H2Sbearing, instead of pyrobitumenbearing, high density methane inclusions occur in carbonate reservoir rocks in the well Puguang 5, indicating that CH4 inclusions and “TSR”formed H2S fluid inclusions were trapped in newly grown calcite crystals at the stage of high temperature cracking of old oil reservoirs; abundant high density methane inclusions and small quantity of light hydrocarbon inclusions occur in lower Silurian siliceous rocks drilled from the well Wuke 1, indicating that the organicrich lower Silurian black shale showing high maturation contains high pressure methane and light hydrocarbon in its geological history. These different types of high density methane inclusions listed above show different genetic mechanisms and different high temperature and high pressure conditions. The authors believe that the results would be helpful for exploration and assessment of gas resulting from cracking of old oil reservoirs and gas from Silurian shale in northeast Sichuan.

Key words:  high density methane inclusions, microRaman spectroscopic analysis, hightemperature cracking of crude oil and gas form shell

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