石油与天然气地质 ›› 2012, Vol. 33 ›› Issue (3): 417-423.doi: 10.11743/ogg20120311

• 油气地质 • 上一篇    下一篇

贵州麻江古油藏成藏期次

高波, 沃玉进, 周雁, 彭勇民, 刘全有, 李双建   

  1. 中国石化 石油勘探开发研究院, 北京 100083
  • 收稿日期:2011-12-10 修回日期:2012-04-30 出版日期:2012-06-28 发布日期:2012-07-10
  • 第一作者简介:高波(1969-),男,高级工程师,油气地质与地球化学。
  • 基金项目:

    石油化工联合基金项目(40739904);中国石化科技部项目(YPH08073)。

Hydrocarbon accumulation phases of Majiang paleo-oil reservoir in Guizhou

Gao Bo, Wo Yujin, Zhou Yan, Peng Yongmin, Liu Quanyou, Li Shuangjian   

  1. SINOPEC Exploration & Production Research Institute, Beijing 100083, China
  • Received:2011-12-10 Revised:2012-04-30 Online:2012-06-28 Published:2012-07-10

摘要:

麻江古油藏是中国南方最大的海相古油藏之一,但目前关于其成藏的时间尚没有统一的认识。在本次研究中,详细分析了储层沥青的地球化学特征及其成因,以此为基础,对麻江古油藏的成藏期次进行了探讨。研究表明,储层沥青的饱和烃色谱图正构烷烃分布完整,但基线明显上凸且存在25-降藿烷,这揭示出麻江古油藏至少存在两期原油充注;奥陶系-泥盆系储层沥青来自相同的烃源岩,表明该区最大规模的原油充注发生在泥盆系沉积之后。应用储层流体包裹体测温与自生伊利石钾氩法定年,结合烃源岩的热演化史进行了成藏期次研究。结果表明,麻江古油藏经历了加里东晚期的小规模成藏及破坏、海西期大规模油气成藏、印支期油气转化及燕山期大规模破坏的演化过程,其中海西期是其主要成藏期。

关键词: 储层沥青, 地球化学, 成藏期次, 麻江古油藏, 贵州, 中国南方

Abstract:

Majiang paleo-oil reservoir is one of the largest marine paleo-oil reservoirs in South China.There is debate about its forming time.This paper investigates the hydrocarbon accumulation period by analyzing the geochemical characteristics and genesis of reservoir-bitumen.The study shows that the distribution of n-alkanes of saturated hydrocarbon chromatogram from the reservoir-bitumen is complete,but the base line is up convex,and 25-norhopane exists.It indicates that crude oil charging occurred at least in two stages in this paleo-oil reservoir.The reservoir-bitumen in Ordovician and Devonian originated from the same source rocks,indicating that the massive crude oil charging occurred after deposition of the Devonian.Reservoir-fluid inclusion thermometry and K-Ar dating of autogenous illite,in combination with thermal history of source rocks,were used to investigate the hydrocarbon accumulation phases.The results shows that Majiang paleo-oil reservoir experienced small-scale hydrocarbon accumulation and damage during the Late Caledonian time,large-scale hydrocarbon accumulation during the Hercynian time,oil-gas conversion in the IndoChinese time,and large scale damage during the Yanshan time, and the Hercynian time is suggested as the main accumulation stage of Majiang paleo-oil reservoir.

Key words: reservoir-bitumen, geochemistry, hydrocarbon accumulation phase, Majiang paleo-oil reservoir, Guizhou, South China

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