Experiment on high-resolution reflection seismic exploration technique for natural gas hydrate in Gemucuo area
LI Pei1, 2, JIANG Chun-Xiang1, 2, RONG Li-Xin1, 2, WANG Xiao-Jiang1, 2, LI Jin-Li1, 2
1.National Modern Geological Exploration Technology Research Center,Langfang 065000,China; 2.Institute of Geophysical and Geochemical exploration,Chinese Academy of Geological Sciences,Langfang 065000,China
Abstract:Gemucuo area is located on the northern margin of the central uplift belt in Qiangtang basin.The results of regional geological survey of the area show that the area is a favorable area of gas hydrate formation.In order to detect the gas hydrate,the authors carried out high resolution seismic reflection detection test in the area.High quality original seismic data were obtained in the process of seismic data acquisition by using such means as the observation system of Intermediate excitation and bilateral symmetry and the receive mode of long spread and shot trace intervals as well as the excitation mode of large tonnage vibrator.In seismic data processing,according to the characteristics of permafrost area in the plateau,the authors conducted a large number of tests for parameters,and used a combination of various means of treatment and the reflection seismic time profiles,thus obtaining high signal-to-noise ratio.The seismic reflection wave group in the seismic time profiles clearly reflects the features of subsurface geological structure.The authors investigated and delineated the favorable target area for gas hydrate accumulation in Gemucuo.The test results show that the high resolution seismic reflection detection technology is a very effective means for detection of natural gas hydrate,and hence it can serve as a reference technology for the seismic exploration of natural gas hydrates in permafrost regions in plateau in future.
李培, 姜春香, 荣立新, 王小江, 李金丽. 戈木错地区天然气水合物高分辨率反射地震探测技术试验[J]. 物探与化探, 2017, 41(6): 1228-1236.
LI Pei, JIANG Chun-Xiang, RONG Li-Xin, WANG Xiao-Jiang, LI Jin-Li. Experiment on high-resolution reflection seismic exploration technique for natural gas hydrate in Gemucuo area. Geophysical and Geochemical Exploration, 2017, 41(6): 1228-1236.
[1] 张美.天然气水合物的研究现状和前景[J].中山大学研究生学刊(自然科学、医学版),2006,27(2):21-30. [2] Kvenvolden K A.A review of geochemistry of methane in nature gas hydrate[J].Organic Geochemistry,1995,23(11/12):997-1008. [3] Humphry Davy. LXIX.The bakerian lecture,on some of the combinations of oxymuriatic gas and oxygen,and on the chemical relations of these principles to inflammable bodies[J].Philosophical Transactions of the Royal Society of London,1811,101:1-35. [4] 史斗,郑军卫.世界天然气水合物研究开发现状和前景[J].地球科学进展,1999,14(4):330-339. [5] Shimizu A Y,Yamame S T,et al.Methane hydrate accumulation along the western Nankai Through[J].The Annals of the New York Acad of Sci,2000,912:136-145. [6] 张洪涛,张海启,祝有海.中国天然气水合物调查研究现状及其进展[J].中国地质,2007,34(6):953-961. [7] 祝有海,张永勤,文怀军,等.祁连山冻土区天然气水合物及其基本特征[J].地球学报,2010,31(1):7-16. [8] 冯兴雷,付修根,谭富文,等.羌塘盆地戈木错地区泥火山群沉积及浅表地球化学特征[J].沉积与特提斯地质,2015,35(1):50-56. [9] 解超明,李才,李林庆,等.藏北羌塘中部首次发现泥火山[J].地质通报,2009,28(9):1319-1324. [10] Dallimore S R,Collett T S.Intrapermafrost gas hydrates from a deep core hole in the Mackenzie Delta,Northwest Territories,Canada[J].Geology,1995,23(6):527-530. [11] 余朝丰.断裂与天然气水合物的依存关系[J]. 海洋地质动态,2006,22(12):34-37. [12] 杨传胜,李刚,龚建明,等.断层对天然气水合物成藏的控制作用[J].海洋地质动态,2009,25(6):1-5. [13] 徐明才,刘建勋,柴铭涛,等.青海木里地区天然气水合物反射地震试验研究[J].地质与勘探,2012,48(6):1180-1187. [14] 刘建勋,张保卫,王小江,等.羌塘盆地浅层地震探测方法技术[J].物探与化探,2015,39(4):679-685. [15] 徐明才,刘建勋,张保卫,等.陆域天然气水合物地震探测有效性试验研究[J].物探化探计算技术,2013,35(4):375-382.