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《Geological Science and Technology Information》 2017-01
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Characteristics of Fine-Grained Sedimentary in Yanchang Formation in Eastern Gansu Province

Li Wei;Wen Zhigang;Key Laboratory of Exploration Technology for Oil and Gas Resources of Ministry of Education,Yangtze University;School of Earth Environment and Water Resources,Yangtze University;  
Based on the drilling and logging data,this paper comprehensively analyses the distribution rule and major controlling factors of the fine-grained system in Eastern Gansu in Ordos Basin from such aspects as the enrichment mechanisms of organic matter,the changes of salinity,redox condition and productivity through core description and geochemical test.The results show that during the deposition of the Chang 7Member,mainly developed in this area were semi-deep to deep lakes with warm and moist climate,which is the advantageous sedimentary enviorenment for organic-rich shale mainly controlled by the sandbody architecture and the shape of lake basin.During the deposition of the Chang 73 Member,depth and scope of the lake sharply increased with water invading rapidly.The salinity difference between the circulation between upper surface water and lower water in the deep lake resulted in the formation of large-area anoxic environment in the deep lake,which is favorable for the development of organic-rich shale.In silent deep-flat lake that is far away from the delta front and in short of material supply,organic-rich shale was well developed,with high organic carbon content and mainly typeⅠ andⅡ kerogen.In slope semi-deep lake close to the delta front with sufficient material supply,wavy-massive silty mudstone was developed,mainly with typeⅡ and Ⅲ kerogen.
【Fund】: 中国石油天然气股份有限公司科技创新项目(2008D-5006-01-10)
【CateGory Index】: P618.13
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