贵州省织金县戴家田煤矿勘查区含煤地层沉积模式

Coal⁃bearing strata sedimentary model of Daijiatian coal mine exploration area in Zhijin County,Guizhou Province

在贵州省织金县戴家田煤矿勘查区含煤地层沉积相基础上,对层序地层关键界面进行了识别。以勘查区实际含煤特征为依据,共划分出3个沉积层序。层序Ⅰ底部以凝灰岩底面为界,顶部以29号煤层顶面为界;层序Ⅱ底部以29号煤层顶面为界,顶部以16号煤层顶面为界;层序Ⅲ底部以16号煤层顶面为界,顶部以二叠系上统顶为界。结合勘查区煤层发育特征分析,认为戴家田煤矿勘查区属典型的海陆过渡相沉积,以下三角洲平原、潟湖—潮坪为主要沉积相特征的沉积模式。

Considering the coal⁃bearing strata sedimentary facies in the exploration area,the sequence stratigraphy key interface was identified.According to the actual coal bearing characteristics,three sedimentary sequences were divided.SequenceⅠis bounded in the bottom by bottom surface of tuff underside,in the top by top surface of No.29 seam.SequenceⅡis bounded in the bottom by top surface of No.29 seam,in the top by top surface of No.16 seam.SequenceⅢis bounded in the bottom by top surface of No.16 seam,in the top by top surface of top Upper Permian.Combined with developmental characteristics analysis of coal seam coal in exploration area,it was believed that Daijiatian coal mine exploration area is typical typical Marine⁃continental transitional facies deposits,and the depositional model is characterized by sedimentary facies such as lower delta plain,lagoon and tidal flat.