苏北盆地海安凹陷泰州组层序地层及沉积特征  

Sequence Stratigraphic Framework and Sedimentary Characteristics of Taizhou Formation in Haian Depression of Subei Basin

作　　者：刘长利[1] 朱筱敏[1] 王兴明[2] 任红民[3] 李树静[1] 

机构地区：[1]中国石油大学资源与信息学院/油气资源与探测国家重点实验室,北京102249 [2]中国石油大港油田公司勘探开发研究院,天津300280 [3]中国石油化工股份有限公司江苏油田分公司,江苏扬州225012

出　　处：《吉林大学学报（地球科学版）》2010年第3期519-526,共8页Journal of Jilin University：Earth Science Edition

基　　金：中国石油化工股份有限公司重点科技攻关项目(P05004)

摘　　要：苏北盆地海安凹陷泰州组形成于晚白垩世,其底界面是由仪征事件形成的区域不整合面,其顶界面是由海安事件形成的局部不整合面。苏北盆地泰州组在形成过程中发生了一次水退,以该水退为界把泰州组分为层序1和层序2两个三级层序。通过对海安凹陷30余口探井的录井、测井和岩心资料的综合分析,认为层序1和层序2都由低位体系域、湖侵体系域和高位体系域组成,并且层序1低位体系域以辫状河三角洲沉积为主;湖侵体系域主要发育深湖—半深湖沉积;高位体系域是在湖平面下降缓慢的沉积环境下以陆源碎屑物质供给量不断减少的三角洲沉积为主,并发育大量的浊流沉积。层序2低位体系域主要发育滨浅湖—半深湖沉积,湖侵体系域以半深湖—深湖沉积环境为主,而高位体系域以滨浅湖—滩坝沉积环境为主。Taizhou Formation in Haian depression of Subei basin developed in Late Cretaceous,the bottom of which was a regional unconformity surface formed by Yizheng movement and the top was a local one by Haian event.There was a regression during its deposition,which divided Taizhou Formation into 2 third-order sequences,named as Sq1 and Sq2.According to the analysis of drilling and core material about 30 wells,both sequences are composed of lowstand systems tract（LST）,transgressive systems tract（TST） and highstand systems tract（HST）.In Sq1,LST mainly developed braided delta facies,TST developed deep and semi-deep lake facies and HST developed delta facies with decrease of terrigenous detrital material flux under slow fall of water-level and a lot of turbidite facies.In Sq2,LST developed shallow-shore and semi-deep lake facies,TST developed deep and semi-deep lake facies,HST developed shallow-shore lake facies and strand-bar facies.

关 键 词：层序 体系域 三角洲 浊流 苏北盆地 海安凹陷 泰州组 

分 类 号：P588.2[天文地球—岩石学] P618.13[天文地球—地质学]