从地震信息探讨塔中地区古生界非构造圈闭
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摘要
塔中地区基本特征是由三条逆冲大断裂控制的背斜隆起构造。纵向上发育多期不整合面,在不整合面上下形成有多种类型的非构造圈闭。主要可归纳出古潜山圈闭、地层圈闭及岩性圈闭三大类,并可细分出九种亚类。潜山圈闭,一般都是下奥陶统碳酸盐岩储集体,本身处于寒武系—下奥陶统烃源岩包围之中,有"近水楼台"之优势;地层圈闭包括不整合面之下的地层削截尖灭圈闭、不整合面之上的地层超覆尖灭圈闭及古风化壳圈闭,它们与大的不整合面相伴生,有断层和不整合面作为油气运移通道,是有利的油气聚集场所;岩性圈闭包括生物丘(礁)、碳酸盐岩隆(异常体)、岩性透镜体、滑塌浊积体、火成岩等,类型多,分布广,面积大,只要有油气通道,是优先捕获油气的有利场所。因此所述各类非构造圈闭均具有油气勘探前景。
Seismic information of data revealed that in Tazhong area it is characteristic of an anticline structure controlled by three thrust fractures,and muti-phrased unconformability contracts presented in vertical.Over and Under these surfaces,various kinds of nonstructural traps developed,and there are many kinds of reservoir rock,such as sandstone,carbonate rock, reef and igneous rock,and so on.These traps can be classi- fied into three types (include nine subtypes);(1) Buried traps that usually are lower Ordovician carbonate reservoir rock quite adjacent to Cambrian—Lower Ordovician source rock,which is a predominant occurrence of hydrocarbon accumulation;(2) Stratigraphic traps that are often associated with large uncon- formable planes and faults as good hydrocarbon migration ways,which are good places of hydrocarbon accumulation; (3)Lithologic traps that are varied and wide-spread,which is also good places preferentially capturing hydrocarbon as long as there any migration way.Different nonstructural traps may offer promising locations of exploration in Tazhong Area.
Seismic information of data revealed that in Tazhong area it is characteristic of an anticline structure controlled by three thrust fractures,and muti-phrased unconformability contracts presented in vertical.Over and Under these surfaces,various kinds of nonstructural traps developed,and there are many kinds of reservoir rock,such as sandstone,carbonate rock, reef and igneous rock,and so on.These traps can be classi- fied into three types (include nine subtypes);(1) Buried traps that usually are lower Ordovician carbonate reservoir rock quite adjacent to Cambrian—Lower Ordovician source rock,which is a predominant occurrence of hydrocarbon accumulation;(2) Stratigraphic traps that are often associated with large uncon- formable planes and faults as good hydrocarbon migration ways,which are good places of hydrocarbon accumulation; (3)Lithologic traps that are varied and wide-spread,which is also good places preferentially capturing hydrocarbon as long as there any migration way.Different nonstructural traps may offer promising locations of exploration in Tazhong Area.
引文
1 朱俊玲,焦存礼,王玉昌等.塔中地区中上奥陶统异常体特征.大庆石油地质与开发,2002,21(5) :13-14
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