四川川中地区晚二叠世蓬溪—武胜台凹对台内生物礁滩分布的控制作用
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摘要
通过对四川盆地川中地区长兴组、飞仙关组沉积相、地震相研究,认为川中地区由于晚二叠世拉张坳陷的原因,在武胜、蓬溪、盐亭一带形成了蓬溪—武胜台凹。蓬溪—武胜台凹南陡北缓,地震反射特征是在长内长顶形成平行-连续双强反射,在飞一段发育叠瓦状前积层。台凹内部上二叠统厚度薄,下三叠统飞仙关组厚度大,形成富泥的沉积补偿平衡型混积体系。蓬溪—武胜台凹控制了台内古地貌高带的形成与发育,也对生物礁滩的分布起到控制作用,台凹后缘遂宁断高带与前缘广安抬斜高带是寻找礁滩气藏的有利区带。
In this paper,both sedimentary and seismic facis of Changxing and Feixianguan formations,central Sichuan Basin,are studied.It is considered that,caused by tensional depression at later Permian,the Pengxi-Wusheng Depressional Platform formed along Wusheng-Pengxi-Yanting zone.The platform is characterized by steep in south and gentle in north,and its seismic reflection is of a parallel-continuous dual strong reflection formed at long-top within platform.In addition,some imbricate forest beds developed in T1f1.Within platform,the upper Permian is featured by thin thickness whereas lower Triassic Feixianguan Formation by thick thickness,and to form a mixed deposition of sedimentary compaction balanced type with rich mud.This platform controls not only the formation and development of paleogeomorphic highs but also the bioreef and shoal distribution.Studied results show that the favorable zones to discover both bioreef and shoal gas reservoirs are Suining fault high in back margin and Guang'an uplift inclined high in front margin within platform.
In this paper,both sedimentary and seismic facis of Changxing and Feixianguan formations,central Sichuan Basin,are studied.It is considered that,caused by tensional depression at later Permian,the Pengxi-Wusheng Depressional Platform formed along Wusheng-Pengxi-Yanting zone.The platform is characterized by steep in south and gentle in north,and its seismic reflection is of a parallel-continuous dual strong reflection formed at long-top within platform.In addition,some imbricate forest beds developed in T1f1.Within platform,the upper Permian is featured by thin thickness whereas lower Triassic Feixianguan Formation by thick thickness,and to form a mixed deposition of sedimentary compaction balanced type with rich mud.This platform controls not only the formation and development of paleogeomorphic highs but also the bioreef and shoal distribution.Studied results show that the favorable zones to discover both bioreef and shoal gas reservoirs are Suining fault high in back margin and Guang'an uplift inclined high in front margin within platform.
引文
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