南海神狐暗沙海区天然气水合物地震识别特征
|
摘要
地震方法是识别海洋天然气水合物的主要手段之一。根据实测的高分辨率多道地震资料,探讨南海北部神狐暗沙海区可能赋存的天然气水合物的地震识别特征,以及该方法在实际工作中的应用。地震反射特征反映神狐暗沙海区存在多处似海底反射(BSR)分布区,总面积约5970 km2.可分为S-BSR、W-BSR和I-BSR三类,以W-BSR为主。此外,地震剖面上还发现弱振幅或振幅空白带、极性反转及低速异常等指示标志。根据BSR及振幅空白带分布状况,估算该区含水合物层的厚度可能为10~264 m,具有较好的资源潜力。
Seismic method is one of important means for research of marine gas hydrate.Based on the measured high resolution multi-trace seismic data,the seismic identification characteristics of potential gas hydrates and the practical application in Shenhu Shoal sea area in northern South China Sea are discussed.The seismic reflection characteristics indicate there are several bottom simulating reflection(BSR) distribution areas with an area of totaling about 5 970 km2,which can be divided into three types of S-BSR,W-BSR and I-BSR,dominated by W-BSR.Furthermore,other features such as weak or blanking amplitude,polarity inversion and low velocity anormaly are found on some seismic profiles.It is estimated from the distribution of BSR and blanking zones that the gas hydrates zone in this sea area is about 10~264 m in thickness,being of good resource potentials of gas hydrates.
Seismic method is one of important means for research of marine gas hydrate.Based on the measured high resolution multi-trace seismic data,the seismic identification characteristics of potential gas hydrates and the practical application in Shenhu Shoal sea area in northern South China Sea are discussed.The seismic reflection characteristics indicate there are several bottom simulating reflection(BSR) distribution areas with an area of totaling about 5 970 km2,which can be divided into three types of S-BSR,W-BSR and I-BSR,dominated by W-BSR.Furthermore,other features such as weak or blanking amplitude,polarity inversion and low velocity anormaly are found on some seismic profiles.It is estimated from the distribution of BSR and blanking zones that the gas hydrates zone in this sea area is about 10~264 m in thickness,being of good resource potentials of gas hydrates.
引文
[1]姚永坚.天然气水合物的形成条件及勘探现状[J].新疆石油地质,2007,28(6):688-672.
[2]徐华宁,杨胜雄,郑晓东,等.南中国海神狐海域天然气水合物地震识别及分布特征[J].地球物理学报,2010,53(7):1691-1698.
[3]公衍芬,曹志敏,郑建斌.天然气水合物的特征及识别标志[J].地质与资源,2008,17(2):32-38.
[4]杨木壮.海洋天然气水合物的地震识别标志[J].南海地质研究,2000,8(12):2-7.
[5]魏伟,张金华,吝文,等.天然气水合物成藏机理及主控因素[J].新疆石油地质,2010,31(6):563-566.
[6]Ecker C,Dvorkin J,Nur A M.Estimating the amount of gas hydrate and free gas from marine seismic data[J].Geophys ics,2000,65:905-908.
[7]Miller J J,Lee M W,Vonhuene R.An analysis of a reflec tion from the base of a gas hydrate zone of Peru[J].AAPG Bull.,1991,75:910-924.
[8]梁劲,王宏斌,赵志超.射线追踪法在南海天然气水合物速度分析中的应用[J].物探化探计算技术,2007,29(6):486-492.
[9]宋海斌,松林修,杨胜雄,等.海洋天然气水合物的地球物理研究():岩石物性[J].地球物理学进展,2001,16(2):110-118.
[10]Andreassen K,Hart P E,Mackay M.Amplitude versus offset modeling of bottom simulating Sseismic reflection associ ated with submarine gas hydrates[J].Marine Geology,1997,137(1-2):25-40.
[11]沙志彬,龚跃华,梁金强.地震属性剖面在天然气水合物识别中的应用[J].南海地质研究,2003,10(14):105-113.
[12]苏丕波,雷怀彦,梁金强,等.南海北部天然气水合物成矿区地球物理异常特征[J].新疆石油地质,2010,31(5):485-488.
[13]沙志彬,王宏斌,杨木壮,等.天然气水合物成矿带的识别技术研究[J].现代地质,2008,22(3):438-446.
[2]徐华宁,杨胜雄,郑晓东,等.南中国海神狐海域天然气水合物地震识别及分布特征[J].地球物理学报,2010,53(7):1691-1698.
[3]公衍芬,曹志敏,郑建斌.天然气水合物的特征及识别标志[J].地质与资源,2008,17(2):32-38.
[4]杨木壮.海洋天然气水合物的地震识别标志[J].南海地质研究,2000,8(12):2-7.
[5]魏伟,张金华,吝文,等.天然气水合物成藏机理及主控因素[J].新疆石油地质,2010,31(6):563-566.
[6]Ecker C,Dvorkin J,Nur A M.Estimating the amount of gas hydrate and free gas from marine seismic data[J].Geophys ics,2000,65:905-908.
[7]Miller J J,Lee M W,Vonhuene R.An analysis of a reflec tion from the base of a gas hydrate zone of Peru[J].AAPG Bull.,1991,75:910-924.
[8]梁劲,王宏斌,赵志超.射线追踪法在南海天然气水合物速度分析中的应用[J].物探化探计算技术,2007,29(6):486-492.
[9]宋海斌,松林修,杨胜雄,等.海洋天然气水合物的地球物理研究():岩石物性[J].地球物理学进展,2001,16(2):110-118.
[10]Andreassen K,Hart P E,Mackay M.Amplitude versus offset modeling of bottom simulating Sseismic reflection associ ated with submarine gas hydrates[J].Marine Geology,1997,137(1-2):25-40.
[11]沙志彬,龚跃华,梁金强.地震属性剖面在天然气水合物识别中的应用[J].南海地质研究,2003,10(14):105-113.
[12]苏丕波,雷怀彦,梁金强,等.南海北部天然气水合物成矿区地球物理异常特征[J].新疆石油地质,2010,31(5):485-488.
[13]沙志彬,王宏斌,杨木壮,等.天然气水合物成矿带的识别技术研究[J].现代地质,2008,22(3):438-446.
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