南海北部神狐海域新近系以来沉积相及水合物成藏模式

匡增桂; 郭依群

doi:10.3799/dqkx.2011.096

南海北部神狐海域新近系以来沉积相及水合物成藏模式

doi: 10.3799/dqkx.2011.096

广州海洋地质调查局, 广东广州 510075

基金项目:

国家重点基础研究发展“973”计划 2009CB219508

国家重点基础研究发展“973”计划 2009CB219502

国土资源部公益性科研专项项目 200811014-02

国家自然科学基金 91028003

详细信息

作者简介:
匡增桂(1983—), 男, 助理工程师, 主要从事石油地质和天然气水合物的研究. E-mail: kzg21001@163.com

中图分类号: P736.21
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出版历程
- 收稿日期: 2011-05-07
- 刊出日期: 2011-09-15

The Sedimentary Facies and Gas Hydrate Accumulation Models Since Neogene of Shenhu Sea Area, Northern South China Sea

Guangzhou Marine Geological Survey, Guangzhou 510075, China

摘要

摘要: 广州海洋地质调查局自2000年以来在南海北部陆坡区相继开展了多个航次的天然气水合物资源的调查及研究工作, 取得了非常丰富的地震资料.在对这些地震资料精细解释的基础上, 识别出了6种典型的地震相: 透镜状前积相、丘状前积相、V字型充填相、席状平行相、底辟—气烟囱状杂乱相、丘状杂乱相; 并由此分析出3种类型的沉积相: 深水浊积相、滑塌相、峡谷水道相.结合似海底反射(BSR) 在研究区范围内的分布, 研究BSR与各沉积相之间的空间位置关系, 由此分析出了3种水合物成藏模式: 断层沟通浊积扇体成藏模式、断层沟通峡谷水道成藏模式、断层沟通峡谷水道及滑塌扇体成藏模式.
- 南海北部 /
- 天然气水合物 /
- 沉积 /
- 成藏模式 /
- 海洋地质
Abstract: Guangzhou marine geological survey have carried out a number of voyages for gas hydrate investigation and research at the continental slope of northern South China Sea since 2000 and has acquired abundance of seismic data.On the basis of detailed interpretation of those seismic data, this paper recognizes six typical seismic facies, namely lenticular progradation facies, hummocky progradation facies, V-shaped filling facies, sheet parallel facies, diapir-gas chimney disorder facies and hummocky disorder facies.Thus developed three sedimentary facies including deep sea fan, slump and canyon channel facies.Combined with the distribution of the bottom simulating reflector (BSR) in the study area and the spatial relationship of the BSR with the variety of sedimentary facies, three gas hydrate accumulation models have been established as follows: fault communication with deep sea fan, fault communication with canyon channel and fault communication with canyon channel and slump fan.
- northern South China Sea /
- gas hydrate /
- sedimetation /
- accumulation model /
- marine gology

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图 1 研究区及构造单元位置

Fig. 1. The location of study area and structural unit

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图 2 神狐海域地震相类型

a.透镜状前积相; b.丘状前积相; c.V字型充填相; d.席状平行相; e.底辟—气烟囱状杂乱相; f.丘状杂乱相

Fig. 2. The seismic facies of Shenhu Sea area

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图 3 层序C深水浊积扇(a) 和层序B滑塌扇(b) 地震反射形态

Fig. 3. The seismic reflection of deep sea fan of sequence C (a) and slump fan of sequence B (b)

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图 4 多期水道叠加地震反射形态

Fig. 4. The seismic reflection of multiperiodic channel

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图 5 断层沟通浊积扇体成藏模式

a.地震反射剖面; b.成藏模式

Fig. 5. The accumulation model of fault communication with deep sea fan

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图 6 断层沟通峡谷水道成藏模式

a.地震反射剖面图; b.成藏模式图

Fig. 6. The accumulation model of fault communication with canyon channel

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图 7 断层沟通峡谷水道及滑塌扇体成藏模式

a.地震反射剖面图; b.成藏模式图

Fig. 7. The accumulation model of fault communication with canyon channel and the slump fan

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表 1 神狐海域层序地层划分对比

Table 1. 1 Recognition and comparison of sequence stratigraphy of Shenhu Sea area

地质时代		年龄(Ma)	SH-7井层位深度(m)	SH-5井层位深度(m)	地震反射界面	层序
第四纪(Q)						A
上新世(N₂)		1.806	104.85	96.73	T₁	B
上新世(N₂)		5.332	171.2		T₂	B
中新世(N₁)	晚(N₁³)	11.608			T₃	C
中新世(N₁)	中(N₁²)	11.608			T₃
注: 数据来源于广州海洋地质调查局《南海北部神狐海域天然气水合物钻探报告》.

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表 2 神狐海域地震相类型及特征

Table 2. Types and characters of seismic facies of Shenhu Sea area

地震相类型	反射特征				发育层序	解释
地震相类型	振幅	连续性	内部结构	外部形态	发育层序	解释
透镜状前积相	中	中	前积	透镜状	C	与深海浊积扇体有关
丘状前积相	中	中	下超	丘状	B	与陆坡滑塌扇体有关
V字型充填相	中—强	好	平行	V字型	A、B、C	与海底峡谷有关
席状平行相	中	好	平行	席状	A、B	与深海沉积有关
底劈—气烟囱状杂乱相	中—弱	差	杂乱	穹隆状	C层序以下	与底劈构造发育有关
丘状杂乱相	中	差	杂乱	丘状	C层序以下	与底劈构造发育有关

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