应用层序地层学方法恢复加里东期古地貌——以济阳坳陷沾化地区为例  

SEQUENCE STRATIGRAPHY APPLIED IN THE RESTORATION OF THE CALEDONIAN PALEOGEOMORPHOLOGY-A CASE STUDY IN ZHANHUA AREA, THE JIYANG DEPRESSION

作　　者：宋国奇[1,2] 徐春华[1,3] 樊庆真[1] 魏艳萍[1] 孔凡顺 

机构地区：[1]胜利石油管理局地质科学研究院 [2]中科院地质与地球物理研究所,北京100101 [3]中国地质大学武汉研究生院,湖北武汉430074 [4]山东煤田勘探公司勘察院

出　　处：《石油实验地质》2000年第4期350-354,共5页Petroleum Geology & Experiment

摘　　要：加里东期风化壳发育的程度直接影响了相关储层的发育 ,而古地貌对次生孔隙的发育起决定作用。针对加里东期古风化面的重要性 ,文中把古地貌分为岩溶高地、岩溶斜坡和岩溶洼地 3个古地貌单元 ,并分析了原有古地貌恢复方法 (残余厚度法、标准法等 )存在的 4个缺点 ,在此基础上提出了以具有等时性的区域性不整合面为核心内容的层序地层学恢复古地貌方法。作者应用该方法对济阳坳陷沾化地区加里东期古地貌进行了恢复 ,并分析了该地区处于岩溶高地的 991潜山和处于岩溶洼地的孤岛潜山两个不同古地貌单元的岩溶发育特征。结果表明 ,层序地层学方法能准确地恢复加里东期古地貌 ,进而能准确地预测次生孔隙发育带 ,并最终指导与岩溶有关的油气勘探。The developed degree of the Caledonian w ea thering crust directly affects the developing of related reservoirs, and paleoge omorphology palys a decisive part in the development of secondary pores. In view of the importance of the Caledonian fossil weathering plane, the paleogeomorphol ogy is divided into karst highland, karst slope and karst depression three paleo geomorphological units in this paper, and four shortcomings existing in the form er paleogeomorphological restorstion methods such as the residual thickness meth od, the standard method, etc. are analysed. On this basis, the sequence stratigr aphy method to restore paleogeomorphology whose kernel content is regional uncon formable planes with isochroneity is suggested. The authors use this method to r estore the Caledonian paleogeomorphology of Zhanhua area in the Jiyang Depressio n and analyse the karst development features of two different paleogeomorphologi cal units in this area, 991 Buried Hill in karst highland and Gudao Buried Hill in karst depression. Results show that the sequence stratigraphy method can accu rately restore the Caledonian paleogeomorphology and predict the developed zones of secondary pores, and at last direct hydrocarbon exploration related to karst .

关 键 词：层序地层学 古生代 岩溶 古地貌恢复 油气勘探 

分 类 号：TE121.3[石油与天然气工程—油气勘探] P618.130.2[天文地球—矿床学]