南海神狐海域X区块天然气水合物的控制因素
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摘要
为了探讨南海神狐海域X区块天然气水合物的控制因素,开展了高分辨地震资料精细解释和天然气水合物地震相研究。结果显示,X区块存在3条主控断层和众多滑塌断层;预测的稳定带内水合物呈多层分布,稳定带底部水合物层厚度较大、连续性较好。结合地震反射特征和可能的气源讨论初步认为,X区块天然气水合物的成藏模式主要有两种类型:在断裂或滑塌构造发育区,水合物的气源以热解成因气为主,水合物呈多层分布;在构造平缓地区,水合物的气源以生物成因气为主,水合物呈单层分布,且主要分布在似海底反射(BSR)之上一个狭窄的范围内。
In order to understand the main controlling factors of gas hydrate occurrences in the X Block of Shenhu area,South China Sea,the fine seismic explanations and seismic facies studies of gas hydrate were carried out.The results show that there exist three important faults and lots of collapse structures,multilayer hydrate-bearing sediments exist in the gas hydrate stable zone,which have big thickness and good continuity in the base of the gas hydrate stable zone.In combination with seismic reflection features and probable gas resource discussion,it is concluded that there probably exist two kinds of reservoir models in the X Block.In the areas where faults or collapse structures develop,the gas resource is probably composed of thermogenic gas,gas hydrate is characterized by multilayer distribution,while in the inactive areas the gas resource is probably composed of biogenic gas,and gas hydrate is characterized by monolayer,which mainly distributes in a narrow zone on the surface of BSR(bottom-simulating seismic reflector).
In order to understand the main controlling factors of gas hydrate occurrences in the X Block of Shenhu area,South China Sea,the fine seismic explanations and seismic facies studies of gas hydrate were carried out.The results show that there exist three important faults and lots of collapse structures,multilayer hydrate-bearing sediments exist in the gas hydrate stable zone,which have big thickness and good continuity in the base of the gas hydrate stable zone.In combination with seismic reflection features and probable gas resource discussion,it is concluded that there probably exist two kinds of reservoir models in the X Block.In the areas where faults or collapse structures develop,the gas resource is probably composed of thermogenic gas,gas hydrate is characterized by multilayer distribution,while in the inactive areas the gas resource is probably composed of biogenic gas,and gas hydrate is characterized by monolayer,which mainly distributes in a narrow zone on the surface of BSR(bottom-simulating seismic reflector).
引文
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[2]吴能友,梁金强,王宏斌,等.海洋天然气水合物成藏系统研究进展[J].现代地质,2008,22(3):356-362.
[3]卢振权,吴能友,陈建文,等.试论天然气水合物成藏系统[J].现代地质,2008,22(3):363-375.
[4]姚伯初.南海的天然气水合物矿藏[J].热带海洋地质,2001,20(2):20-28.
[5]姚伯初,杨木壮.南海晚新生代构造运动与天然气水合物资源[J].海洋地质与第四纪地质,2008,28(4):93-100.
[6]Prell W L,Wang P,Blum P,et al.Proceeding of the OceanDrilling Program,Leg184,Scientific Reports[R].College Sta-tion:Texas A&MUniversity,2003.
[7]张光学,黄永样,祝有海,等.南海天然气水合物成矿远景研究[J].海洋地质与第四纪地质,2002,22(1):75-81.
[8]祝有海,张光学,卢振权,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.
[9]张功成,米立军,吴时国,等.深水区——南海北部大陆边缘盆地油气勘探新领域[J].石油学报,2007,28(2):15-21.
[10]王宏斌,黄永样,梁劲,等.南海北部陆坡坳隆断裂带中水合物赋存的温压环境[J].现代地质,2006,20(1):103-108.
[11]龚建明,张敏,陈建文,等.天然气水合物发现区和潜在区气源成因[J].现代地质,2008,22(3):415-419.
[12]吴时国,姚根顺,董冬冬,等.南海北部陆坡大型气田区天然气水合物的成藏地质构造特征[J].石油学报,2008,29(3):324-328.
[13]祝有海,吴必豪,罗续荣,等.南海沉积物中烃类气体(酸解烃)特征及其成因与来源[J].现代地质,2008,22(3):408-414.
[14]朱伟林,张功成,高乐.南海北部大陆边缘盆地油气地质特征与勘探方向[J].石油学报,2008,29(1):1-9.
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