The tectonism during Yanshan Period in southern Junggar foreland basin and its implications for hydrocarbon accumulation
The tectonism during Yanshan Period in southern Junggar foreland basin and its implications for hydrocarbon accumulation
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发表时间：
2005
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通讯作者：
Fang Shi-hu;Jia Cheng-zao;Song Yan;Xu Huai-min;Liu Lou-jun
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作者：
Fang Shi-hu;Jia Cheng-zao;Song Yan;Xu Huai-min;Liu Lou-jun
燕山期盆地体系的变化、沉积中心的迁移、与构造运动有关的砾岩分布与晚侏罗世-早白垩世和晚白垩世相一致，表明准噶尔南部前陆盆地的沉积与天山地区的变形存在时间上的联系。晚侏罗世至早白垩世白垩系清水河组卡拉扎砾岩和底砾岩是邻近相对高地的剥蚀产物或冲积砾岩。这些砾岩的分布证明了晚侏罗世至早白垩世盆地边界向北明显缩小，白垩世期间博格达山成为准噶尔盆地南部的另一个物源。准噶尔盆地南部的砾岩在晚侏罗世-早白垩世和晚白垩世期间记录了活跃的构造活动和天山带明显的隆升剥蚀作用，导致塔里木盆地和准噶尔盆地南部的沉积序列差异很大。多源、多期生烃、多期成藏限制了准噶尔盆地南部前陆盆地油气系统发育的关键时刻。燕山期（侏罗系—白垩纪）是准噶尔南部前陆盆地生烃、运烃和成藏的同一时期。侏罗系—白垩系储层是主要的油气藏，砾岩和不整合也形成了一些油气藏，成为今后隐蔽油气藏和地层/岩性圈闭勘探的有利目标。燕山期及之前形成的构造与油气成藏匹配良好，有利于油气勘探。
The change of basin system,migration of depocenters,distribution of conglomerates related to tectonism of Yanshan Period were consistent with the Late Jurassic-the Earliest Cretaceous and the Late Cretaceous,implying a temporal link between sedimentation of southern Junggar foreland basin and deformation of Tianshan area.The Kalazha conglomerate and the bottom conglomerate of Cretaceous Qingshuihe Formation forming in the Late Jurassic to the earliest Cretaceous were the denudation products or alluvial conglomerates around adjacent relative highland.The distribution of these conglomerates proved that the basin boundary shrank northward obviously during the Late Jurassic to the earliest Cretaceous,and the Bogeda Mountain became another provenance of southern Junggar basin during Cretaceous.The conglomerates in southern Junggar basin recorded active tectonism and obvious uplift and denudation of Tianshan belt during the Late Jurassic-the Earliest Cretaceous and the Late Cretaceous,led to the widely different sedimentary successions in Tarim basin and southern Junggar basin.Multi-source,multi-phase hydrocarbon generation and multi-phase pool forming restricted the critical moments of the petroleum system in southern Junggar foreland basin.The Yanshan Period(Jurassic-Cretaceous) was coeval with hydrocarbon generating,migrating and accumulating in the southern Junggar foreland basin.The reservoirs of Jurassic-Cretaceous were the major hydrocarbon reservoirs,the conglomerates and unconformity also led to the formation of some hydrocarbon pools,which become the advantageous targets for future exploration of subtle pools and stratigraphic/ lithologic traps.The structures formed during Yanshan Period and before were well matched with the hydrocarbon accumulation and advantageous for petroleum exploration.