四川盆地垫江—万县地区长兴组层序格架内沉积相演化
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摘要
通过对露头剖面、钻井岩心、测井和地震等资料的综合分析,认为四川盆地垫江—万县地区上二叠统长兴组总体为碳酸盐岩台地沉积。由于峨眉地裂运动的影响,造成垫江—万县地区具有"两台-两槽"的特征。在三级层序地层格架建立的基础上,研究沉积相的展布规律,发现受开江—梁平海槽的控制,长兴组时期发育较为对称的碳酸盐岩沉积体系,主要发育开阔台地相、台地边缘相及斜坡相。长兴组2个三级层序高水位体系域沉积时期,台地边缘相带内发育的生物礁、生屑滩及潮坪相为有利相带;海侵体系域沉积时期,只有上部三级层序台地边缘发育了一定规模的礁滩体。因海退的影响,上部三级层序发育的台内礁滩体与下部三级层序发育的台内礁滩体相比,具有向研究区北东方向迁移的特征。
After integration analysis of outcrop,core,logging and seismic data,it is recognized that Upper PermianChangxing Formation is carbonate platform deposition in Dianjiang-Wanxian area,Sichuan Basin.Because of E-mei taphrogeny,two platforms and two trenches developed in Dianjiang-Wanxian area.Based on the establishment of third-order sequence framework,the distribution of sedimentary facies is studied.It is considered that there is a carbonate platform system during the Changxing period in Dianjiang-Wanxian area,which is controlled by Kaijiang-Liangping trench and includes open platform,platform edge and ramp facies.Reef,bioclastic shoal and tidal flat facies developed in the platform edge during the high system tract period of the two third-order sequences of Changxing Formation are favorable facies belts.And only a little reef and shoal developed in platform edge during the transgression system tract period of the upper third-order sequence.Being affected by regression,reef and shoal moved to the east-north of the study area.
After integration analysis of outcrop,core,logging and seismic data,it is recognized that Upper PermianChangxing Formation is carbonate platform deposition in Dianjiang-Wanxian area,Sichuan Basin.Because of E-mei taphrogeny,two platforms and two trenches developed in Dianjiang-Wanxian area.Based on the establishment of third-order sequence framework,the distribution of sedimentary facies is studied.It is considered that there is a carbonate platform system during the Changxing period in Dianjiang-Wanxian area,which is controlled by Kaijiang-Liangping trench and includes open platform,platform edge and ramp facies.Reef,bioclastic shoal and tidal flat facies developed in the platform edge during the high system tract period of the two third-order sequences of Changxing Formation are favorable facies belts.And only a little reef and shoal developed in platform edge during the transgression system tract period of the upper third-order sequence.Being affected by regression,reef and shoal moved to the east-north of the study area.
引文
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[4]刘娟,田景春,张翔,等.川南麻柳场—大塔场地区上三叠统须家河组沉积相研究[J].岩性油气藏,2009,21(3):70-75.
[5]徐樟有,宋丽,吴欣松,等.川中地区上三叠统须家河组典型气藏解剖与天然气成藏主控因素分析[J].岩性油气藏,2009,21(2):7-11.
[6]段金宝,黄仁春,程胜辉,等.川东北元坝地区长兴期—飞仙关期碳酸盐岩台地沉积体系及演化[J].成都理工大学学报:自然科学版,2008,35(6):663-668.
[7]牟传龙,马永生,谭钦银,等.四川通江—南江—巴中地区长兴组—飞仙关组沉积模式[J].地质学报,2007,81(6):820-826.
[8]马永生,牟传龙,郭彤楼.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,12(3):179-185.
[9]马永生,牟传龙,郭旭升,等.川东北地区长兴组沉积特征与沉积格局[J].地质论评,2006,52(1):25-29.
[10]刘宝珺,许效松,潘杏南,等.中国南方古大陆沉积地壳演化与成矿[M].北京:科学出版社,1993:90-115.
[11]王成善,李祥辉,陈洪德,等.中国南方二叠纪海平面变化及升降事件[J].沉积学报,1999,17(4):536-541.
[12]冯增昭.碳酸盐岩岩相古地理学[M].北京:石油工业出版社,1989:110-126.
[13]马永生,梅冥相,陈小兵,等.碳酸盐岩储层沉积学[M].北京:地质出版社,1999:104-120.
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