热带海洋学报 ›› 2018, Vol. 37 ›› Issue (3): 80-85.doi: 10.11978/2017075

所属专题: 南海专题

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南海北部陆坡深水区浅层天然气藏特征

钟广见1,2(), 张如伟1,2, 易海1,2, 冯常茂1,2, 赵忠泉1,2   

  1. 1. 国土资源部海底矿产资源重点实验室, 广东 广州 510760
    2. 广州海洋地质调查局, 广东 广州 510760
  • 收稿日期:2017-07-01 修回日期:2017-12-20 出版日期:2018-06-10 发布日期:2018-05-03
  • 作者简介:

    作者简介:钟广见(1965—), 男, 湖南省桃源县人, 教授级高工, 博士, 主要从事海洋地质研究。Email: 2645078906@qq.com

  • 基金资助:
    中国地质调查局专项(DD20160154)

The characteristics of shallow gas reservoir developed in the northern continental slope of South China Sea

Guangjian ZHONG1,2(), Ruwei ZHANG1,2, Hai YI1,2, Changmao FENG1,2, Zhongquan ZHAO1,2   

  1. 1. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510760, China
    2. Guangzhou Marine Geological Survey, Guangzhou 510760, China
  • Received:2017-07-01 Revised:2017-12-20 Online:2018-06-10 Published:2018-05-03
  • Supported by:
    China Geological Survey Project (DD20160154)

摘要:

南海北部陆坡深水区的浅层天然气藏是一种伴随天然气水合物的新型油气藏, 具有埋藏浅、规模大的特点, 其埋藏深度一般小于300m。浅层天然气藏由深部裂解气沿断裂上升被天然气水合物封盖而形成, 识别似海底反射(BSR)是寻找浅层天然气藏有效方法。浅层天然气藏的气源主要有热解气、生物气和混合气, 陆坡张性断裂是气体运移的主要通道, 水合物下部的砂层是浅层天然气藏的主要储集层, 水合物层则是封盖层。从南海发现的天然气水合物分布特征看, 浅层天然气藏在陆坡深水区广泛分布且气藏厚度大, 潜在资源量非常可观, 是一种新型的开采成本相对低廉的油气藏。

关键词: 浅层天然气藏, 天然气水合物, 陆坡, 似海底反射(BSR), 南海

Abstract:

The shallow gas reservoir in the northern deep water area of the South China Sea (SCS) is a new type of oil-gas reservoir associated with gas hydrate, which has the characteristics of shallow burial and large scale, and its burial depth is generally less than 300 m. The shallow gas reservoir was formed by the gas hydrate cap in the deep cracking gas along the fault, and the identification of bottom simulating reflector is an effective method to find the shallow gas reservoir. The gas sources mainly include: pyrolysis gas, biogas and mixture. Slope tensile rupture is a major channel for gas migration, a sand layer at the bottom of the hydrate is the main reservoir of shallow gas accumulation, and the hydrate layer is blocked. Looking from gas hydrate distribution characteristics found in the SCS, shallow gas reservoir, widely distributed in slope deep-water area, with big reservoir thickness, and potentially significant resources, is a new type of reservoir while mining costs are relatively low.

Key words: shallow gas reservoir, gas hydrate, continental slope, bottom simulating reflector (BSR), South China Sea