南海北部陆坡深水区浅层天然气藏特征

doi:10.11978/2017075

摘要/Abstract

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

钟广见, 张如伟, 易海, 冯常茂, 赵忠泉. 南海北部陆坡深水区浅层天然气藏特征[J]. 热带海洋学报, 2018, 37(3): 80-85.

Guangjian ZHONG, Ruwei ZHANG, Hai YI, Changmao FENG, Zhongquan ZHAO. The characteristics of shallow gas reservoir developed in the northern continental slope of South China Sea[J]. Journal of Tropical Oceanography, 2018, 37(3): 80-85.

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