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推挤叠加型滑脱构造及其对油气成藏的控制——以尼日尔三角洲盆地深水区为例 被引量:1
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作者 逄林安 康洪全 《西安石油大学学报(自然科学版)》 CAS 北大核心 2019年第2期18-24,30,共8页
以尼日尔三角洲盆地深水逆冲区为研究对象,利用已有的三维地震和钻/测井资料,从下伏塑性泥岩的地震反射结构出发,结合浅层地层沉积特征,分析研究区的构造样式、构造活动期次及构造活动对成藏条件的影响。结果表明:①在研究区下伏塑性泥... 以尼日尔三角洲盆地深水逆冲区为研究对象,利用已有的三维地震和钻/测井资料,从下伏塑性泥岩的地震反射结构出发,结合浅层地层沉积特征,分析研究区的构造样式、构造活动期次及构造活动对成藏条件的影响。结果表明:①在研究区下伏塑性泥岩内识别出推挤叠加型滑脱构造样式。其下部为主滑脱面,是盆地内受重力滑脱作用广泛发育的滑脱面,上部为次滑脱面,局部发育。②推挤叠加型滑脱构造的形成和演化经历了逆冲推覆和塑性泥岩挤压2个阶段,从中新世末一直活动至今,是深水逆冲区超大型断背斜圈闭形成的主要原因。③推挤叠加型滑脱构造的发育对油气成藏具有"双刃剑"的影响,其持续性的长期活动有利于大中型圈闭的形成和油气充注,又能降低下伏烃源岩的成熟度,同时也加大了油气保存的风险。 展开更多
关键词 推挤叠加型滑脱构造 塑性泥岩 逆冲区 尼日尔三角洲
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Paleoearthquake Studies along the Nalinlaka Fault of the Late Pleistocene in Lhasa,Tibet 被引量:1
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作者 Liu Jing Guan Peng +4 位作者 Shen Xuhui Xu Yueren Shen Junfeng Jing Feng Hong Shunying 《Earthquake Research in China》 2010年第4期467-477,共11页
As the most import fault of the Late Pleistocene in the Lhasa area,the Nalinlaka fault is a left-lateral thrust fault,striking NWW,dipping SSW with a high dip angle,and extending over 33km.According to studies on the ... As the most import fault of the Late Pleistocene in the Lhasa area,the Nalinlaka fault is a left-lateral thrust fault,striking NWW,dipping SSW with a high dip angle,and extending over 33km.According to studies on the latest strata on the Nalinlaka fault zone,this fault zone has been obviously active since the Late Pleistocene and the movement left behind some geomorphologic phenomena on the earth's surface,especially at the sites of the gully west of Cijiaolin and around Xiecun village.For example,some rivers,ridges and terraces are displaced,forming beheaded gullies and fault escarps.The horizontal displacements since the Late Pleistocene at the above two places are 54m ~ 87m,20m ~ 67m,respectively.Based on studies on the 4 trenches along the fault using the progressive constraining method,we conclude that there might have been 5 paleoearthquake events along the Nalinlaka fault since 70ka B.P.,the ages of each paleoearthquake are 68.53,54.40,< 41.23,21.96,9.86ka B.P.,and the average recurrence interval is 14.67ka.Because of the limits of trenches and earthquake events exposed by each trench,no single trench completely revealed all 5 events.There may therefore be some errors in determining the upper and lower limits of some events in this article. 展开更多
关键词 LHASA Active fault PALEOEARTHQUAKE
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