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现代地质 ›› 2013, Vol. 27 ›› Issue (4): 907-914.

• 石油地质学 • 上一篇    下一篇

川东北地区飞仙关组—长兴组天然气富集机制

冯冲1,郭彤楼2,邹华耀1,成晓啭1   

  1. (1.中国石油大学 油气资源与探测国家重点实验室,北京102249;2.中国石化 勘探南方分公司,四川 成都610041)
  • 出版日期:2013-08-10 发布日期:2013-08-07
  • 作者简介:冯冲,男,博士研究生,1984年出生,地质资源与地质工程专业,主要从事油气成藏机理与分布规律研究。Email:fengchong135@hotmail.com。
  • 基金资助:
    国家科技重大专项“四川盆地二、三叠系碳酸盐岩大中型气田富集规律与成藏机理研究”(2011ZX05005-003-009HZ);国家自然科学基金青年基金项目“川东北地区二叠系-三叠系白云岩化的流体来源与模式”(41103020)。

Enriched Mechanism of Natural Gas in the Feixianguan-Changxing Formations in the Northeast Sichuan Basin

FENG Chong1, GUO Tong-lou2,ZOU Hua-yao1,CHENG Xiao-zhuan1   

  1. (1.State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing102249,China; 2. SINOPEC Southern Exploration Company, Chengdu, Sichuan610041, China)
  • Online:2013-08-10 Published:2013-08-07

摘要: 飞仙关组—长兴组气藏在川东北不同地区成藏要素基本相同,但是区域上天然气富集程度有所不同。为了揭示天然气的富集机制,通过烃源岩分析测试资料、岩心和薄片观察资料、测井和岩屑录井资料等,分析了川东北地区飞仙关组—长兴组天然气的来源、主力烃源岩生烃强度、储层性质与规模、天然气的保存条件、生烃演化史和油气藏的调整过程。研究表明:(1)川东北地区处于或邻近生烃中心,油气初次运移距离短;(2)礁滩岩性气藏相对独立,礁滩储层分布范围控制着古油藏的规模;(3)气藏上覆多套膏盐岩盖层,天然气保存条件好;(4)早期的古油藏经历高温已经全部裂解,形成现今的气藏;在构造作用控制下,天然气聚集成藏经历了古油藏的形成、古油藏裂解及古气藏的形成和现今气藏的形成3个阶段。对川东北天然气富集机制的探讨,有助于进一步寻找有利靶区,指导天然气勘探。

关键词: 富集机制, 天然气, 飞仙关组, 长兴组, 川东北地区

Abstract: In Northeast Sichuan Basin, the accumulation elements of different areas of Feixianguan-Changxing Formations are the same, but the enriched degrees of the nature gas vary from region to region. In order to disclosure the enriched mechanism of the nature gas, this paper analyzed the origin of the nature gas in Feixianguan-Changxing Formations, the hydrocarbon generating density of main resource rocks, the characteristics and the scales of the reservoirs, the conservation condition of the natural gas, the history of hydrocarbon generation and the adjusting process of the oil and gas reservoirs with the analyzed and examined data of resource rocks, the data of the cores and lamellas, and the data of the well logging and cutting logging, etc. Results show that: (1)the Northeast Sichuan Basin is in the center of hydrocarbon generation or its vicinity , and the primary migration distances of the oil and gas are short; (2)the lithologic gas reservoirs of reefs and sands are independent, and the distribution of the reservoirs controls the scales of the oil and gas reservoirs; (3)several gypsum mantles cover the natural gas reservoirs and the conservation condition of the natural gas is good; (4)the high temperature made the early oil reservoirs cracked to the present gas reservoirs; (5)with the tectonic movement, the accumulating processes of gas are separated into three steps, the formation of the early oil reservoirs, the cracking of the early oil reservoirs with the formation of the gas reservoirs and the formation of the present gas reservoirs. Discussing the enrichment mechanism of natural gas is useful for finding the beneficial target areas in the Northeast Sichuan Basin when natural gas is explored.

Key words: enriched mechanism, natural gas, Feixianguan Formation, Changxing Formation, Northeastern Sichuan Basin

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