试论合肥盆地燕山运动古城幕及其石油地质意义
摘要
合肥盆地是中国东部目前勘探面积最大、勘探程度最低的复合型残留盆地。本文简要地介绍了合肥盆地的构造演化历史,并利用野外露头资料、沉积学资料和地震资料进行综合研究,论证了晚白垩世内幕存在一次大规模的由南向北的挤压推覆运动,并建议将该期构造运动命名为燕山运动古城幕;通过对下侏罗统防虎山组和下白垩统朱巷组烃源岩主要生烃过程的分析,认为下侏罗统防虎山组烃源岩在晚侏罗-早白垩世时开始生烃,下白垩统朱巷组烃源岩主要在燕山运动古城幕之前开始生烃。燕山运动古城幕对下侏罗统防虎山组烃源岩形成的油气有利也有弊,有利的一面是利于所生成油气的排烃,不利的一面是早期聚集形成的油气藏可能遭到改造和破坏;对下白垩统朱巷组烃源岩形成的油气,主要排烃期与圈闭形成期相匹配,有利于油气的排烃和聚集成藏,据此指出了合肥盆地大桥向斜的勘探思路,即应以寻找古背斜及其上形成的披覆构造以及浅层的盖层条件较好的构造圈闭,这种类型的圈闭受构造运动改造较弱,保存条件较好,是寻找原生油气藏的主要勘探目标区。
Because of the complicated tectonic movement of Hefei basin,it is the largest and lowest exploration complex basin in East China.By comprehensive study on field outcrops,sedimentary and seismic data comprehensive studying,this paper briefly introduces its tectonic evolution history and insist that there is a large scale compressional nappe movement during late Cretaceous,and it is named as Gucheng episode of Yanshan movement.According to the analysis of hydrocarbon generating process in Fanghushan Formation of Lower Jurassic and Zhuxang Formation of Lower Cretaceous,We think that it has good and bad effects on the hydrocarbon generation in Fanghushan Formation of Lower Jurassic,and has good effect on the hydrocarbon preservation in Zhuxang Formation of Lower Cretaceous.Above all,We put forward the exploration idea of Daqiao syncline in Hefei basin,that is finded as the plaeo-anticline and the drapping structure above as well as the shallow structural trap with good sealing condition.
Because of the complicated tectonic movement of Hefei basin,it is the largest and lowest exploration complex basin in East China.By comprehensive study on field outcrops,sedimentary and seismic data comprehensive studying,this paper briefly introduces its tectonic evolution history and insist that there is a large scale compressional nappe movement during late Cretaceous,and it is named as Gucheng episode of Yanshan movement.According to the analysis of hydrocarbon generating process in Fanghushan Formation of Lower Jurassic and Zhuxang Formation of Lower Cretaceous,We think that it has good and bad effects on the hydrocarbon generation in Fanghushan Formation of Lower Jurassic,and has good effect on the hydrocarbon preservation in Zhuxang Formation of Lower Cretaceous.Above all,We put forward the exploration idea of Daqiao syncline in Hefei basin,that is finded as the plaeo-anticline and the drapping structure above as well as the shallow structural trap with good sealing condition.
引文
[1] 毛德民.合肥盆地构造形成机制分析[J].石油勘探与开发,1997,24(2) :33～36
[2] 薛爱民,金维浚,等.大别山北缘合肥盆地中、新生代构造 演化[J].高校地质学报,1999,5(2) :157-162
[3] 周进高,赵宗举,等.合肥盆地构造演化及含油气性分析[J].地质学报,1999,73(1) :15～24
[4] 朱光,徐嘉炜.郯庐断裂带的平移幅度、平移时代及其构造模式[A].见陈川等主编《第30届国际地质大会论文集》,第14卷(构造地质学、地质力学)[C].北京:地质出版 社,167-175
[5] 徐树桐,江来利,刘贻灿.大别山(安徽部分)的构造格局和演化过程[J].地质学报,1992,66(1) :1～14
[6] 李曙光,刘德良.大别山印支运动的同位素年代学证据[J].大地构造与成矿学,1990。14(2) :159-163
[2] 薛爱民,金维浚,等.大别山北缘合肥盆地中、新生代构造 演化[J].高校地质学报,1999,5(2) :157-162
[3] 周进高,赵宗举,等.合肥盆地构造演化及含油气性分析[J].地质学报,1999,73(1) :15～24
[4] 朱光,徐嘉炜.郯庐断裂带的平移幅度、平移时代及其构造模式[A].见陈川等主编《第30届国际地质大会论文集》,第14卷(构造地质学、地质力学)[C].北京:地质出版 社,167-175
[5] 徐树桐,江来利,刘贻灿.大别山(安徽部分)的构造格局和演化过程[J].地质学报,1992,66(1) :1～14
[6] 李曙光,刘德良.大别山印支运动的同位素年代学证据[J].大地构造与成矿学,1990。14(2) :159-163
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心