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现代地质 ›› 2013, Vol. 27 ›› Issue (2): 425-434.

• 水合物勘探 • 上一篇    下一篇

神狐钻探区天然气水合物成藏地质条件分析

梁永兴1,2,曾溅辉1,2,郭依群3,匡增桂3   

  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中国石油大学 地球科学学院,北京102249;
    3广州海洋地质调查局 海洋矿产地质调查所,广东 广州510760
  • 收稿日期:2012-09-24 修回日期:2013-01-18 出版日期:2013-04-01 发布日期:2013-04-22
  • 作者简介:梁永兴,男,硕士研究生,1987年出生,石油地质学专业,从事天然气水合物成藏研究。Email:y.x-1987@163.com。
  • 基金资助:

    国土资源部天然气水合物科技项目(GZH201100305-07-02)。

Analysis of Natural Gas Hydrate Accumulation Conditions of Shenhu Prospect

LIANG Yong-xing1,2, ZENG Jian-hui1,2, GUO Yi-qun3, KUANG Zeng-gui3   

  1. 1State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing102249, China;
    2College of Geosciences, China University of Petroleum, Beijing102249, China;
    3Institute of Marine Geology for Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou, Guangdong510760, China
  • Received:2012-09-24 Revised:2013-01-18 Online:2013-04-01 Published:2013-04-22

摘要:

以天然气水合物成藏系统理论为指导,对神狐钻探区天然气水合物成藏地质条件进行了系统研究。研究结果表明:神狐钻探区具有优越的烃类生成体系和流体运移体系。天然气水合物气源以生物气-热成因气混合气为主,气源岩生烃潜力大;断层、气烟囱以及断层滑脱面可以为含烃流体在纵向和横向上的运移提供优势运移通道。地温特征和成藏就位体系-沉积物岩性及其岩性组合特征是控制该区水合物层在空间尺度上分布不均匀的主要原因,地温和地温梯度越低,沉积物粒度越粗,且具备“上细下粗”的沉积物岩性组合更有利于水合物的形成。

关键词: 天然气水合物, 成藏系统, 成藏就位体系, 神狐钻探区

Abstract:

Based on the theory of gas hydrate geological system, gas hydrate accumulation conditions of Shenhu prospect are studied. The results indicate that there are excellent gaseous hydrocarbon source sub-system and gas-bearing fluid migration subsystem. The gas hydrate in this area is proved to be a mixture of biogenic gas and thermogenic gas and the hydrocarbon potential of the source rock is high; faults, gas chimneys, and detachment surface constitute the dominant migration pathway for the hydrocarbon to migrate horizontally and vertically. Geothermal characteristic and gas hydrate reservoir accumulation subsystem (characteristics of lithology and lithological assemblage) are the main reason why gas hydrate is distributed heterogeneously in all spatial scales in the study area. The lower the temperature of the earth and the geothermal gradient, the coarser the sediment grain is. In addition, the fine-above-coarse-below lithological assemblage is more beneficial for the gas hydrate to accumulate.

Key words: natural gas hydrate, geological system, reservoir accumulation sub-system, Shenhu prospect

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