2008•Inner Mongolia Petrochemical IndustryRequires access
Paleogeographic Evolution of the Middle Jurassic Yan'an Formationin Zhen-Jing Area,Ordos Basin
Zhongtang Su
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Abstract
Based on studies of other people,new logging data and well drilling data,the article expatiated the Paleogeographic Evolution of target formation,taking ZhenYuan-JingChuan area in ordos basin as an example.From bottom to top of Yan'an formation,the sedimentary system from fluvial depositional system changed into delta depositional system.Channel bar,point bar,alluvial flat and backbank swamp etc are mainly fluvial microfacies which were developed in section Y10; distributary channel,flood plain and swamp etc are mainly delta microfacies which were found in section Y9-Y6;and fluvial deposition was developed again in section Y4+5.