
第24
第3期 2010年6月
现代地质 GEOSCIENCE
南中国海东沙海域水合物成藏动力学模拟
郭依群12,李桂菊3,乔少华3,庄新国3
(1.广州海洋地质调查局,广东广州510760;2.中国地质大学海洋学院,北京
100083
3.中国地质大学资源学院,期北武汉430074)
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摘要:基于南中国海东沙海域某地震削面资料,利用Basin2二维模拟软件,结合研究区有关地温场、热流探测资料和 ODP184航次调查的岩心数据,重塑了研究区沉降史、有机质生烃史、古地温场与热史变迁。进而利用“生物成因天然气水合物成激动力学模拟系统"(HydrateDynamics)软件,模拟了水合物案集的过程与分布范围。模拟结果表明,研究区水合物稳定域较厚(200~250m),有机质含量适中,生物成因甲烷主要在海底1km以浅范围内形成。稳定域之下早先埋藏的沉积物中有机质形成的生物成因甲烷在压实流的作用下能够向浅部层位中运移聚集,从而对现在的矿层有所
贡献。水合物主要赋存于稳定域底部以上50m的层位内,富集带中水合物的平均含量约为5%。关键词:天然气水合物;成藏动力学;Basin2二维模拟软件;东沙海域;南中国海
中图分类号:P744.4
文献标志码:A
文章编号:10008527(2010)03045706
SimulationofReservoirDynamicofGasHydratesof
DongshaAreaof South China Sea
GUO Yi-qun'-2,LI Gui-ju',QIAO Shao-hua',ZHUANG Xin-guo(1. Guangzhou Marine Geological Suney, Guangzhou, Guangdong 510760, Chine; 2. School of Marine Geosciences, China Unieersity of Geosciemces,Bejing100083, China 3.Faculy of Earth Resowrces, China Uninersity of Geosciences,Wuhan, Hubei 430074, China)
Abstract: Based on the seismic profile data of Dongsha of the South China Sea, using a two-dimensional simulation software, Basin2, combining with the data of the geothermal field, heat flow and core of leg 184 of ODP, this paper rebuilt the subsidence history of the study area, the hydrocarbon-generating history of the or-ganic matter, and the change history of the ancient geothermal field and thermal.The paper simulated the process of hydrate accumulation and distribution with “ Biogenic Gas Hydrate Reservoir Dynamics Simulation System" (Hydrate Dynamics). Simulation results show that the thickness of the hydrate stability region is large(200 ~250 m), and organic matter content is moderate, biogenic methane is generated 1 000 mbsf. Biogenic methane generated by the organic matter in the sediments buried previously under the stability region can mi-grate and accumulate in the shallow strata because of the compaction flow, and contribute to the current mineral deposit. Hydrates occur in the stable region mainly for the thickness of 50 m, and average saturation of hydrate is about 5%.
Key words: gas hydrate; reservoir dynamic; Basin2 twodimensional simulation software; Dongsha area; South China Sea
收璃日期:2010-02-05;,改回日期:2010-04-22;责任编辑:或开静。
基金项目:国家"天然气水合物资源综合评价及勘探开发战略研究"专项项目(GZH200200203-05);国土资源部公益性科研专
项项目(200811014-02);国家重点基础研究发展计划"973"项日(2009CB219508)。
作者简介:郭依群,女,高级工程师,1968年出生,石油地质学专业,主要从事石油地质和天然气水合物的研究。
Emil:guol180@163.com。