| 琼东南盆地长昌凹陷三维地震区中新统微观构造成因探讨 |
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| 引用本文： | 于俊峰.琼东南盆地长昌凹陷三维地震区中新统微观构造成因探讨[J].海相油气地质,2011,16(2):66-72. |
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| 作者姓名： | 于俊峰 |
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| 作者单位： | 中海石油(中国)有限公司湛江分公司 |
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| 基金项目： | “十一五”国家重点科技攻关课题(课题编号:2008ZX05023-004) |
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| 摘 要： | 基于高精度三维地震资料的精细解释和方差体顺层切片技术,在琼东南盆地长昌凹陷中新统首次发现高密度小断裂,它们近SN走向,断距6～28m,长0.5～4km,倾角约60°.这些小断裂既不是渐新统继承性断裂,也不是近期热点讨论的多边形断层,而是在中新世特定地质条件下由局部引张形成的微观构造.其成因为:1)中新世琼东南盆地处于坳...
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| 关 键 词： | 琼东南盆地 长昌凹陷 中新统 微观构造 构造成因 地震解释 |
Genesis of Miocene Microtectonics in 3-Dimensional Seismic Block in Changchang Depression,Qiongdongnan Basin |
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| Yu Junfeng.Genesis of Miocene Microtectonics in 3-Dimensional Seismic Block in Changchang Depression,Qiongdongnan Basin[J].Marine Origin Petroleum Geology,2011,16(2):66-72. |
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| Authors: | Yu Junfeng |
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| Institution: | Yu Junfeng CNOOC Zhanjiang Branch Cop.,Box 22,Potou,Zhanjiang,Guangdong,524057 China |
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| Abstract: | By means of detailed interpretation and variance cube surface slice technology of high frequency 3-dimentional seismic data,a great denseness of microfaults are firstly discovered in Miocene strata in Changchang Depression,Qiongdongnan Basin.They are approximately in SN direction,cut off 6～28m and 0.5～4km long with about 60° obliquity.It is indicated that these microfault systems neither have a consequential relationship with early faults nor polygonal faults that recently discussed on so they were formed by local extension in special geological conditions during Mesozoic period.The genesis of them is summarized in four aspects: 1) During Miocene,Qiongdongnan Basin had entranced postrift stage and Changchang Depression developed with no faults except for basin-controlled faults.2) SN-directional microfaults would not develop in the depression because there is not EW-directional stress in this region.3) The Oligocene faults and Miocene faults are two sets of fault systems because the Oligocene faults are in NW direction and have great difference in spatial distribution,which are dominantly controlled by Paleocene structural patterns that,while the Miocene microfaults are in SN direction and have no relationship with the Oligocene fault system.4) Polygonal faults are commonly with diverse boundary numbers and anomalistic boundary shapes,which are greatly different with Miocene SN-directional faults.It is believed that the existence of these high dense microfaults is most significant to oil and gas exploration in deep water. |
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| Keywords: | Miocene Microfaults Genesis of structure Seismic interpretation Changchang Depression Qiongdongnan Basin |
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