断陷湖盆陡坡带陆相层序地层的“沉积滨线坡折”问题探讨  

STUDY ON DEPOSITIONAL SHORELINE BREAK FOR TERRIGENOUS SEQUENCE STRATIGRAPHY ALONG THE STEEP SLOPE ZONE OF FAULT-DEPRESSED LACUSTRINE BASIN

作　　者：胡受权[1] 郭文平[1] 杨凤根[2] 颜其彬[3] 刘树根[4] 童崇光[4] 

机构地区：[1]中山大学地球科学系,广州510275 [2]南京大学地球科学系,南京210093 [3]西南石油学院勘探系,四川南充637001 [4]成都理工学院石油系,成都610059

出　　处：《古地理学报》2000年第4期20-29,共10页Journal of Palaeogeography：Chinese Edition

基　　金："油气藏地质及开发工程"国家重点实验室开放基金项目 (PLN992 2号 );广东省自然科学基金资助项目 (994113号 )联合资助

摘　　要：在分析断陷湖盆陡坡带不同构造部位的可容空间变化规律及其沉积响应特征的基础上 ,探讨了断陷湖盆陡坡带参照井选取的可容空间机理 ,并阐明了参照井的选择原则 ;根据参照井处的沉积相迁移特征及体系域叠置样式 ,建立了在参照井的背景下 ,Ⅰ型与Ⅱ型陆相层序划分及其层序界面判识标准 ,以及低水位体系域 (LST)、水进体系域 (TST)、高水位体系域 (HST)及水退体系域 (RST)的识别模式。以泌阳断陷双河—赵凹地区老第三系核三上段为例 ,采用泌 2 0 7井为参照井 ,开展了断陷湖盆陡坡带陆相层序地层学的尝试性研究 ,并编制了该层段的陆相层序地层等时框架模式。研究结果表明 ,采用选取参照井的办法 ,可以有效地解决断陷湖盆陡坡带陆相层序地层分析中的“沉积滨线坡折”Based on analysis of the sedimentary response to the variation in accommodation space at different structural positions of the steep slope zone in the fault depressed lacustrine basin, accommodation mechanism for the selecting of a reference well has been discussed, and the principle for the selecting of a reference well has been put forward. According to the facies migration characteristics and superimposing patterns of system tracts in the reference well, the standards for identifying two types of terrigenous sequences (type Ⅰand Ⅱ) and for their system tracts have been established. In this paper, the Upper Member of E h 3 in the Shuanghe-Zhao′ao area of the Biyang fault depression, is taken as a case with well B207 as a reference well to study terrigenous sequence stratigraphy. The research results show that the problem about depositional shoreline break for terrigenous sequence along the steep slope zone of fault depressed lacustrine basin can be effectively resolved by using a reference well.

关 键 词：断陷湖盆 陡坡带 层序地层学 老第三纪 沉积滨线坡折 参照井 

分 类 号：P539.2[天文地球—古生物学与地层学] P512.2[天文地球—地质学]