摘要
根据钻井、测井及三维地震资料,利用层拉平技术、切片及属性分析技术对四川盆地剑阁-九龙山地区长兴组与飞仙关组主要层序界面进行了古地貌恢复,探讨了古地貌演化特征及其对礁滩的控制作用。研究表明,该区古地貌整体具有西南高北东低的格局,在古地貌演化过程中研究区内碳酸盐台地沉积区具有由西南向北东不断扩张的趋势,反映了长兴期至飞仙关期整体海退、沉积物不断向深水充填的特征。随着台缘及台内正地形等古地貌高带的迁移,礁滩体发育有利区也随之迁移,其中剑阁地区的Lg68井—Lg63井—Lg62井一带为长兴末期继承性古地貌高地,是长兴组与飞仙关组各时期礁滩体垂向叠置发育最为有利的区域。九龙山构造主体为飞仙关组二段多期台缘滩横向迁移叠置的区域,是飞仙关组鲕滩体发育最为有利的区域。
Utilizing core,well logging and 3D seismic data, technologies such as horizon flattening, section and attribute analysis were used to reconstruct the paleogeomorphology environments in Changxing and Feixianguan Formations＇ main sequence boundaries in Jiange and Jiulongshan districts, the Sichuan Basin. The features of paleogeomorphological evolu- tion were investigated and their control on the reef flat were discussed. Results show that paleo topography of the area is featured by higher southwestern parts and dipping down to the Northeastern parts. The carbonate platform＇ s constant pro- gredation from southwest to northeast during the paleo-geomorphological evolution in the area leds to features such as ma- rine regression, sediment filling into deep water during the periods of Changxing and Feixianguan deposition. The reef flat＇ s favorable depo-center areas were also transferred in tune with the migration of paleo-landform＇ s high belt and plat- form margin. The area around wells Lg68, Lg63 and Lg62 is an inherited paleogeomorphological high grounds, represen- ting the most favorable place for the reef flat＇ s vertical aggredation of Changxing and Feixianguan carbonates in the Jiange district. The major positive structure in Jiulongshan area is composed of Feixianguan formation＇ s second section, which are a set of platform margin oolitic beaches superimposed one on another in transverse and overlaying fashion. It is also the most favorable area for development of oolitic beach in Feixianguan formation.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2016年第6期854-861,共8页
Oil & Gas Geology
基金
中国石油西南油气田分公司重大科技专项(2013ZD01-02)
关键词
长兴组
飞仙关组
古地貌演化
礁滩体
剑阁-九龙山地区
四川盆地
Changxing Formation, Feixianguan Formation, paleogeomorphological evolution, reef flat, Jiange-Jiulongshanregion, Siehuan Basin
