第25卷第4期 2011年8月
现代地质 GFOSCIENCE
南海神狐海域天然气水合物注热降压开采
数值模拟研究
胡立堂1.2，张可霓12，高童1，2（1.北京师范大学水科学研究院，北京100875；
2.北京师范大学地下水污染控制与修复教育部工程研究中心，北京100875）
Vel 25Na. 4 Aug 2011
摘要：针对南海神狐海域天然气水合物成藏条件，利用pT+H软件和水平井技术对天然气水合物的注热和注热降压开采效果进行了模拟分析。重点讨论了注入热水温度为30、60、90℃时水合物饱和度以及CH，气体饱和度、CH。产气率、累积CH，产气量和产水量的变化规律，发现两种开采模式下水合物低饱和度分布范围随时间增长和温度升高而增大；CH，产气率在开采10d内升高较快，之后逐渐减小。模拟结果表明：注热降压开采模式比单纯注热模式的效果有
的CH，产气量不大。研究结果可为南海神孤海域和类似地区天然气水合物开采提供参考。关键词：水合物；水平井；CH。产气率；注热降压；TOUGH2；神孤海域
中图分类号：P744.4；P618.13
文献标志码：A
文章编号：10008527(2011)04-067507
NumericalStudiesofGasProductionfromGasHydrateZoneUsingHeat InjectionandDepressurizationinShenhuArea,theSouthChinaSea
HU Li-tang'-2, ZHANG Keni-2, GAO Tong-2
(1. College of Water Sciences, Bejing Normal Uninersity, Bejing100875, China; 2. Engineering Research Center of Groundwater
Pollution Conzrol and Remediation of Ministry of Education, Bejing Nomal Unitersity, Bejing 100875, China)
Abstract: Based on geologic conditions of natural gas hydrate deposits, this paper used pT + H software and horizontal wells to evaluate gas production strategies including heat injection and combined use of heat injection and depressurization. This paper discussed the change of the saturation of gas hydrate, the saturation of CH, in gas phase, the production rate of CH, in gas phase, cumulative CH。production, and water production when in-jecting water temperature is 30, 60 and 90 °C. It was found that the distribution area of low hydrate saturation increases with increasing time and temperature, and the production rate of CH, increases rapidly within 10 days and then decreases gradually. The results verified the advantages of combine method of heat injection and depre ssurization, and demonstrated the temperature is not sensitive to the production rate of CHg. It was found that cumulative CH, volume in Shenhu area is not big mainly because of the low permeability. The findings can provide the references for gas production of natural gas hydrates in Shenhu area, the South China Sea or similar areas.
Key words: gas hydrate; horizontal well; production rate of CHy; heat injection and depressurization: TOUCH2；Shenhuarea
收稿日期：2011-0316；改回日期：2011-05-28；责任编辑：潘令枝。基金项目：中国科学院广州天然气水合物研究中心开放基金（o807s1）。
作者简介：胡立堂，男，副教授，1976年出生，水文地质专业，主要从事地下水数值模拟和渗流计算方面的研究。
Emsil: litanghu@ bnu. edu cn。