Representation of gas hydrate fracture migration system by seismic
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摘要: 南海是世界4大海洋油气聚集中心之一，南海北部陆坡已发现多个油气田和天然气水合物（以下简称水合物）矿藏。依靠高精度的地震探测技术，近年南海水合物矿藏的勘探大有进展，但是地震检测技术的成功率有待提高。科学钻探证实，单纯依靠稳定带中识别BSR寻找水合物有多解性，而水合物成藏系统的研究，尤其是对运聚输导系统的研究目前还不够深入。裂隙是南海北部水合物成藏成矿的主要输导体系，为有效表征水合物的裂隙输导系统，该文结合油气藏运聚系统研究的成功经验，将常规油气勘探中已成功应用的裂隙识别技术，应用到琼东南海域似海底反射区，成功雕刻表征出了水合物裂隙输导体系，并基于结果讨论了其运移效能。裂隙地震表征可作为水合物输导体系的研究手段应用于其成藏系统的研究。Abstract: The South China Sea is one of the four major offshore oil and gas accumulation centers in the world. Many oil and gas fields and hydrate deposits have been found on the northern slope of the South China Sea. The amount of hydrate resources is huge. Relying on high-precision seismic exploration technology, the exploration of hydrate deposits in the South China Sea has progressed greatly in recent years, but the success rate of seismic detection technology needs to be improved. Scientific drillings have proved that there are multiple solutions to find hydrate only by identifying BSR in the stable zone, while the research on hydrate accumulation system is not deep enough, especially the migration, accumulation and dispersion system. Fractures are the main systems of hydrate accumulation and mineralization in the north of the South China Sea. In order to effectively characterize the fracture system of hydrate, this paper, combined with the successful experience of oil and gas reservoir migration and accumulation system research, applied the fracture identification technology used to study fracture channels to discover the diapir gas field to the BSR area of Qiongdongnan Basin, and successfully identified the hydrate fracture transport system. Based on the results, the migration efficiency was discussed. In the study of gas hydrate accumulation systems, the seismic characterization of fractures can be used as a means to study the transport system.
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Key words:
- gas hydrate /
- migration system /
- fracture identification technique /
- diapir /
- Qiongdongnan Basin
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图 1 南海北部大陆边缘水合物研究区位置
Figure 1. Location of hydrate study areas in the northern continental margin of the South China Sea
图 4 莺歌海盆地底辟裂隙三维可视化图
研究区位置见图 1中Z1。
Figure 4. Three dimensional visualization of diapir fractures in Yinggehai Basin
图 5 琼东南盆地BSR与裂隙空间展布
研究区位置见图 1中Z2。
Figure 5. BSR and fracture spatial distribution in Qiongdongnan Basin
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