琼东南盆地超压系统泄压带: 可能的天然气聚集场所

翟普强; 陈红汉

doi:10.3799/dqkx.2013.081

琼东南盆地超压系统泄压带: 可能的天然气聚集场所

doi: 10.3799/dqkx.2013.081

翟普强^{1, 2,},
陈红汉^{1, 2, ,}

1.
中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074
2.
中国地质大学资源学院, 湖北武汉 430074

基金项目:

"十二五"国家科技重大专项 2011ZX05023-004-010

详细信息

作者简介:
翟普强(1983-), 男, 博士研究生, 主要从事沉积盆地含烃流体地质和油气成藏过程研究.E-mail: zhaipq@163.com

通讯作者:
陈红汉, E-mail: hhchen@cug.edu.cn

中图分类号: P618.13
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- 被引次数: 0
出版历程
- 收稿日期: 2013-03-26
- 刊出日期: 2013-07-01

Discharging Zones of Overpressure System in Qiongdongnan Basin, Northern South China Sea: Implications for Favorable Sites of Natural Gas Accumulation

ZHAI Pu-qiang^{1, 2
,},
CHEN Hong-han^{1, 2
, ,}

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 泄压带是超压系统内部流体向外运移的通道和有利的油气聚集场所, 对水溶相天然气析离成藏更有着重要意义.本文综合应用速度谱、测井、钻井和地层测试等资料预测了琼东南盆地超压系统的分布, 将其划分为3种结构类型; 结合粘土分析等资料识别出了4种类型的泄压带, 并讨论了泄压带的分布与可能的天然气聚集区带.琼东南盆地中央坳陷带整体发育一个超压系统, 其分布格局主要受陆坡带的形成和莺歌海盆地超压传递的影响, 陆坡区的超压明显强于非陆坡区, 西部的超压整体强于东部并在浅部呈现自西向东传递的趋势.泄压带内的天然气成藏主要取决于压力、温度和溶解气量, 需满足溶解气量足够多和溶解度变化量足够大, 相对而言, Ⅱ型泄压带成藏条件最优, 既有断裂沟通深部水溶气和浅部储层, 又有温压条件的显著变化, 因而流体运移最活跃.Ⅲ型泄压带次之, 但分布最广, 该类型最有利部位分布在陵水低凸起和宝岛凹陷北坡.
- 泄压带 /
- 超压系统 /
- 流体运移 /
- 脱溶作用 /
- 天然气成藏 /
- 琼东南盆地 /
- 石油地质
Abstract: Discharging zones are channels for fluid to move out from inside the overpressure system and favorable sites for petroleum accumulation, which are of great significance to the accumulation of water-soluble gas by exsolution. The overpressure system distribution of Qiongdongnan basin is predicted and divided into three types based on the comprehensive analysis of the velocity spectrum, logging, drilling and formation test data. In addition, four types of discharging zones are identified according to the mineral analysis. The distribution of discharging zones and possible sites for petroleum accumulation are finally discussed. There exists only one overpressure system which is effected by the development of continental slop system and the pressure transfer from Yinggehai basin, the pressure along the slop belt is much stronger and the top surface of overpressure system in the west is shallower than that in the east. Accumulation of water soluble gas in the pressure discharging zones is totally determined by pressure, temperature and the amount of dissolved gas, and it is vital whether there is adequate amount of dissolved gas and sufficient changes in solubility.The accumulation conditions of type II discharging zone are the most favorable one, resulting in more active fluid activities. The favorable sites of type III discharging zone are distributed near the Lingshui low uplift and the northern slop of Baodao sag, along boundary faults and close to the normal pressure zone.
- discharge zones /
- overpressure system /
- fluid migration /
- degasification /
- hydrocarbon accumulation /
- Qiongdongnan basin /
- petroleum geology

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图 1 琼东南盆地构造单元、钻井、地震测线分布和沉积充填概况

Fig. 1. Map showing the structural division, wells, seismic lines and deposition in Qiongdongnan basin

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图 2 琼东南盆地地层压力(a)、压力系数(b)和地层温度(c)随深度变化

Fig. 2. The plots of formation pressure (a), pressure coefficient (b) and formation temperature (c) vs. depth in Qiongdongnan basin

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图 3 应用地震层速度预测超压的流程

Fig. 3. The flow chart showing the steps of formation pressure prediction using seismic velocity spectrum

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图 4 琼东南盆地地层压力系数等值线

a.陵三段底部(T70); b.陵二段底部(T62);c.三亚组底部(T60);d.梅山组底部(T50)

Fig. 4. The contour maps of formation pressure coefficient

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图 5 琼东南盆地超压系统顶面埋深图(压力系数1.27)

Fig. 5. Depth contours of the top surface of overpressure system in Qiongdongnan basin

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图 6 琼东南盆地压力系统结构划分与泄压带识别综合评价

Fig. 6. Map showing synthetic recognition of formation pressure architectures and discharging zones

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图 7 琼东南盆地地层压力结构划分与泄压带识别

Fig. 7. Diagram showing division of formation pressure architectures and recognition of discharging zones

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图 8 典型压力预测剖面揭示的泄压带发育特征(剖面位置见图 1)

Fig. 8. Typical profiles of pressure coefficient showing the characteristics of discharging zones

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