泌阳凹陷湖相白云岩层序地层学分析
Analysis of high-resolution sequence stratigraphy of lake-dolomite formation in Biyang depression
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摘要: 泌阳凹陷湖盆中心安棚地区核二段和核三段上部发育一套巨厚白云岩层系地层,岩性以泥质白云岩、白云质泥岩、泥岩、纯白云岩和碱层为主,属淡化期和咸化期相互交替的常年碱性盐湖沉积体系。笔者从湖相白云岩层系沉积特征入手,首先从剖面上对长期旋回、中期旋回和短期旋回进行层序分析,然后从沉积成岩角度对该短期旋回和韵律旋回进行高分辨率层系地层分析。Abstract: A suit of huge-thick dolomite formation was formed in the second and up-third of Hetao yuan Formation in Anpeng district of the center of lake-basin of Biyang depression.The main rocks are argillaceo us dolomite,dolomitic mudstone,mudstone,dolomite and trona formation.It is a perennial alkal escence saline sedimentary system.Based on the sedimentary charact eristics of lake-dolomite formation,the author first analyses the sequence of length-cycles,met aphase-cycles and short-cycles from the south to north section,and then the short-cycle and rhythm-cycle by high-resolution sequence stratigraphy method from the aspect of sediment and diagenesis.
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