南中国海东沙海域水合物成藏动力学模拟
|
摘要
基于南中国海东沙海域某地震剖面资料,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藏动力学模拟系统"(Hydrate Dynamics)软件,模拟了水合物聚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(200~250 m),有机质含量适中,生物成因甲烷主要在海底1 km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50 m的层位内,富集带中水合物的平均含量约为5%。
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 organic 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 migrate 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%.
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 organic 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 migrate 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%.
引文
[1]龚再升,李思田,谢泰俊,等.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997:1-223.
[2]肖军,王华,郭齐军,等.南堡凹陷温度场、压力场及流体势模拟研究:基于Basin2盆地模拟软件[J].地质科技情报,2003,22(1):67-74.
[3]姜涛,任建业.基于盆地模拟技术的潮汕坳陷油气勘探前景预测[J].海洋地质动态,2004,20(6):20-27.
[4]王宏斌,郭依群.东沙群岛区天然气水合物资源调查报告(2002)[R].广州:广州海洋地质调查局,2003.
[5]Wang P,Prell W L,Blum P,et al.Proceedings of the OceanDrilling Program:Initial Reports,Volume 184[M].CollegeStation:the Ocean Drilling Program,2000:1-103.
[6]刘以宣,卓家伦.从南海北部新构造运动特征试论该区地质环境的稳定性[J].热带海洋,1984,3(3):55-64.
[7]姚伯初,曾维军,Hayes D E,等.中美合作调研南海地质专报[M].武汉:中国地质大学出版社,1994:1-204.
[8]汪集旸.南海地区热流值等值线图[R].广州:广州海洋地质调查局,1995:1-60.
[9]中国科学院南海海洋研究所海洋地质构造研究室.南海地质构造与陆缘扩张[M].北京:科学出版社,1988:1-96.
[10]Bethke C M,Zhao X,Torgersen T.Groundwater flow and the4He distribution in the Great Artesian Basin of Australia[J].Journal of Geophysical Research,1999,104:12999-13011.
[11]Ungerer P.Geological and geochemical models in oil exploration:priciples and paractical examples[M]//Demaison G,MurrisR.Petrolum Geochemistry and Basin Evaluation.Tulsa:AAPGMemoir,1984,35:15-26.
[12]祝有海,黄永样,张光学,等.南海天然气水合物成矿条件与找矿前景[J].石油学报,2001,22(5):6-10.
[13]吕万军.“生物成因天然气水合物成藏动力学模拟及稳定带预测系统”说明书[P/OL].中华人民共和国国家版权局,2003,软件登记号:2004SR08516.
[2]肖军,王华,郭齐军,等.南堡凹陷温度场、压力场及流体势模拟研究:基于Basin2盆地模拟软件[J].地质科技情报,2003,22(1):67-74.
[3]姜涛,任建业.基于盆地模拟技术的潮汕坳陷油气勘探前景预测[J].海洋地质动态,2004,20(6):20-27.
[4]王宏斌,郭依群.东沙群岛区天然气水合物资源调查报告(2002)[R].广州:广州海洋地质调查局,2003.
[5]Wang P,Prell W L,Blum P,et al.Proceedings of the OceanDrilling Program:Initial Reports,Volume 184[M].CollegeStation:the Ocean Drilling Program,2000:1-103.
[6]刘以宣,卓家伦.从南海北部新构造运动特征试论该区地质环境的稳定性[J].热带海洋,1984,3(3):55-64.
[7]姚伯初,曾维军,Hayes D E,等.中美合作调研南海地质专报[M].武汉:中国地质大学出版社,1994:1-204.
[8]汪集旸.南海地区热流值等值线图[R].广州:广州海洋地质调查局,1995:1-60.
[9]中国科学院南海海洋研究所海洋地质构造研究室.南海地质构造与陆缘扩张[M].北京:科学出版社,1988:1-96.
[10]Bethke C M,Zhao X,Torgersen T.Groundwater flow and the4He distribution in the Great Artesian Basin of Australia[J].Journal of Geophysical Research,1999,104:12999-13011.
[11]Ungerer P.Geological and geochemical models in oil exploration:priciples and paractical examples[M]//Demaison G,MurrisR.Petrolum Geochemistry and Basin Evaluation.Tulsa:AAPGMemoir,1984,35:15-26.
[12]祝有海,黄永样,张光学,等.南海天然气水合物成矿条件与找矿前景[J].石油学报,2001,22(5):6-10.
[13]吕万军.“生物成因天然气水合物成藏动力学模拟及稳定带预测系统”说明书[P/OL].中华人民共和国国家版权局,2003,软件登记号:2004SR08516.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心