东海陆架盆地地震层序特征及地质属性
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摘要
应用SYNTRAK-480型高分辨率数字地震仪对东海陆架盆地地层进行了探测研究。通过全区地震资料的解释,根据地震反射波及反射界面特征,共识别出T02、T03、T04、T05、T06和Tg等6个反射界面。重点对T02、T04、T05、T06和Tg反射层进行追踪对比解释,建立了统一的地震层序和地层格架。依据地震层序划分原则和方法,自上而下将基底反射界面以上的地震反射层划分为5个地震层序,即:Ⅰ(海底面—T02)、Ⅱ(T02—T05)、Ⅲ(T05—T06)、Ⅳ(T06—Tg)、Ⅴ(Tg以下)层序;其中第二地震层序可以进一部划分为两个亚地震层序Ⅱ1、Ⅱ2,经与研究区相邻海陆已知地质资料的对比分析,确定了该区5个不同地震层序的地质年代分别为Q+N、E3+E2+E1、K、J、前中生界。中生界沉积为有利勘探目的层,尤其是闽江凹陷与基隆凹陷潜力大,为油气勘探的重点区。
High resolution multi-channel seismic survey is a cost-efficient technique for geological exploration.We conducted high resolution multi-channel seismic survey with the SYNTRAK-480,and studied the stratigraphical sequences in the East China Sea Basin.Based on the characteristics of seismic reflection records retrieved from the multi-channel seismic data,6 reflectors marked as T02,T03,T04,T05,T06 and Tg are recognized and 6 seismic sequences established by correlation.From the top to the bottom,they are Ⅰ(sea floor—T02),Ⅱ(T02—T05),Ⅲ(T05—T06),Ⅳ(T06—Tg)andⅤ(Tg —below),and the second sequence can be further divided to two subsequences,Ⅱ1 and Ⅱ2.Compared with the data from the adjacent sea and land areas,these seismic sequences are Q+N,E3+E2+ E1,K,J and Pre-Mesozoic respectively in age.The Mesozoic deposit is a favorable oil and gas exploration target in this area,especially in the Minjiang sag and Keelung sag.
High resolution multi-channel seismic survey is a cost-efficient technique for geological exploration.We conducted high resolution multi-channel seismic survey with the SYNTRAK-480,and studied the stratigraphical sequences in the East China Sea Basin.Based on the characteristics of seismic reflection records retrieved from the multi-channel seismic data,6 reflectors marked as T02,T03,T04,T05,T06 and Tg are recognized and 6 seismic sequences established by correlation.From the top to the bottom,they are Ⅰ(sea floor—T02),Ⅱ(T02—T05),Ⅲ(T05—T06),Ⅳ(T06—Tg)andⅤ(Tg —below),and the second sequence can be further divided to two subsequences,Ⅱ1 and Ⅱ2.Compared with the data from the adjacent sea and land areas,these seismic sequences are Q+N,E3+E2+ E1,K,J and Pre-Mesozoic respectively in age.The Mesozoic deposit is a favorable oil and gas exploration target in this area,especially in the Minjiang sag and Keelung sag.
引文
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[4]王鹏,赵志刚,张功成,等.东海盆地钓鱼岛隆褶带构造演化分析及对西湖凹陷油气勘探的意义[J].地质科技情报,2011,30(4):65-72.[WANG Peng,ZHAO Zhigang,ZHANGGongcheng,et al.Analysis on structural evolution in DiaoyuIslands folded-uplift belt,East China Sea Basin and its impacton the hydrocarbon exploration in Xihu Sag[J].GeologicalScience and Technology Information,2011,30(4):65-72.]
[5]Vail P R,Mitchum Jr R M,ThompsonⅢS.Seismic stratigra-phy and global changes of sea level,Part 3:relative changes ofsea level from coastal onlap[J].AAPG Memoir,1977,26:63-81.
[6]Vail P R.Seismic stratigraphy interpretation procedure[J].AAPG Studies in Geology,1987,27(11):1-10.
[7]郭军华.冲绳海槽南部地震层序与构造复原[D].青岛:中国科学院海洋研究所,2004.[GUO Junhua.Seismic sequences andthe tectonic restoration of the southern Okinawa Trough[D].Qingdao:Institute of Oceanology,Chinese Academy of Sci-ences,2004.]
[8]李大心,张胜业,刘庆生,等.地球物理方法综合应用与解释[M].武汉:中国地质大学出版,2003:136-138.[LI Daxin,ZHANG Shengye,LIU Qingsheng,et al.Comprehensive ap-plication and interpretation of geophysical methods[M].Wu-han:China University of Geosciences Press,2003:136-138.]
[9]李维显.东海陆架多旋回复合盆地的油气远景[C]//东海陆架盆地油气资源勘探论文集.北京:石油工业出版社,2004:31-36.[LI Weixian.The multiple rotary recovery of oil gas pros-pect in East China Sea shelf basin.[C]//The oil and gas re-source exploration on anthology in East China Sea shelf basin.Beijing:Petroleum Industry Press,2004:31-36.]
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