CAJ | 학술논문

根据鄂尔多斯盆地西部及南部奥陶纪露头勘察结果,尤其是中奥陶统平凉组页岩在盆地的西部及南部普遍存在,结合地表露头及盆内钻孔资料,系统分析研究了鄂尔多斯盆地祁连海域早古生代奥陶纪不同时期沉积环境特点,分析了各沉积期的岩相古地理特征.受中央古隆起形成和祁连海向东逐渐海侵影响,马家沟组一期到五期,地形坡度较缓,鄂尔多斯盆地古地理格局由祁连海向盆地内部分别发育开阔海台地、局限海台地到蒸发台地相沉积.马家沟组六期和平凉期以及其上的上奥陶统沉积时期,主要为开阔海台地、斜坡相和深水盆地相沉积,在台地向斜坡的转换部位发育一些生物碎屑灰岩及由珊瑚组成的生物礁滩相沉积,斜坡部位发育平凉组笔石页岩斜坡相沉积,构成了华北盆地边缘中-上奥陶统一套特殊的局部天然气勘探组合.鄂尔多斯祁连海域奥陶纪岩相古地理研究具有重要的地质意义和实际生产意义.
근거악이다사분지서부급남부오도기로두감찰결과,우기시중오도통평량조혈암재분지적서부급남부보편존재,결합지표로두급분내찬공자료,계통분석연구료악이다사분지기련해역조고생대오도기불동시기침적배경특점,분석료각침적기적암상고지리특정.수중앙고륭기형성화기련해향동축점해침영향,마가구조일기도오기,지형파도교완,악이다사분지고지리격국유기련해향분지내부분별발육개활해태지、국한해태지도증발태지상침적.마가구조륙기화평량기이급기상적상오도통침적시기,주요위개활해태지、사파상화심수분지상침적,재태지향사파적전환부위발육일사생물쇄설회암급유산호조성적생물초탄상침적,사파부위발육평량조필석혈암사파상침적,구성료화북분지변연중-상오도통일투특수적국부천연기감탐조합.악이다사기련해역오도기암상고지리연구구유중요적지질의의화실제생산의의.
Based on the investigation results of outcrop, especially considering the universal existence of Pingliang Formation shale in western and southern Ordos Basin, combined with the outcrop and well information, this paper systemically studies the sedimentary environment of Qilian Sea of Ordos Basin in Early Paleozoic Ordovician, and lithofacies palaeogeography of every sedimentary period is reconstructed. Affected by the formation of the central paleo up-lift and Qilian Sea's invading gradually toward east, the lithofacies paleogeographic framework of Ordos Basin totally showed that open-sea platform, limited sea platform and evaporating platforms were successively distributed during Majiagou age 1, Majiagou age 2 and Majiagou age 3. During Majiagou age 4 and Majiagou age 5, shallow-water carbonate facies, especially edge slope facies and shoal reef facies, were developed and they will be the potential reservoirs. During Majiagou age 6 and Pingliang age, the maximum regression occurred, and open-sea facies and deep-sea basin facies were developed. The graptolite shale of Pingliang Formation is good source rock. The study of the lithofacies paleogeography of Ordovician in Ordos Basin has important significances in both geological theory and production.