朔县矿区太原组沉积体系与煤聚积规律

研究了朔县矿区太原组沉积特征、沉积相和沉积体系，在此基础上分析了太原组下组煤的沉积环境和聚煤规律。研究表明，太原组下部主要为障壁-泻湖-潮坪沉积体系；上部主要为河控浅水三角洲沉积体系。下组煤（即9、10、11号煤层）形成于障壁坪和泻湖坪环境，煤组下部砂体与煤厚具有互为消长的成因关系，即砂岩厚度大的区域不利于成煤。

Depositional Systems and Coal Accumulation Law of Taiyuan Formation in Shuoxian Mning Area

Based on the analyses of the sedimentary characteristics,depositional facies and systems of the Taiyuan formation in the Shuoxian Mining Area,the authors go further into the coal accumulation laws.The study shows that the lower part of the Taiyuan formation is mainly the barrier lagoon tidal flat depositional system;while the upper part is mainly the fluvial controlled shallow water deltaic depositional system.The lowergroup of (No.9,10 and 11 coal seams) was formed in the barrier beach and logoon environment.The thickness of coal seams varied with the thickness of the sand body beneath them.They have a negetive relationship,that is,the area with large thickness of the sandstone is not favourable to coal deposit sedimentation.