马依西勘探区含煤地层岩相及沉积环境分析

根据盘南矿区马依西井田大量地质资料分析，认为龙潭组形成于潮坪、三角洲及海湾—泻湖沉积体系，下部为潮坪—潮道沉积组合，主要由潮坪相、潮道相、沼泽及泥炭沼泽相组成，形成的煤层硫分高，连续性差；中部为三角洲沉积组合，主要由前三角洲相、三角洲前缘相及三角洲平原相组成，其煤层硫分低，稳定性好，分叉少；上部为海湾—潟湖相沉积组合，由潟湖相局部海湾相及沙洲砂坝相组成。分流河道的泛滥盆地、支流间湾、废弃河道、潮坪—潮道为本区煤层的形成提供了有利沉积环境。

Coal-bearing Strata Lithofacies and Depositional Environment Analyses in Mayixi Exploration Area

Based on large amount geological data analyses in Mayixi minefield, Pannan mining area, considered that the Longtan Formation was formed on tidal flat, delta and bay-lagoon depositional systems. The lower part is tidal flat-tidal channel sedimentary association, composed mainly of tidal flat, tidal channel, swamp and peat bog facies, formed coal seams with high sulfur content and poor continuity; middle part is deltaic sedimentary association, composed mainly of prodeha, delta front, and delta plain facies, formed coal seams with low sulfur content, good continuity and less splitting; upper part is bay-lagoon sedimentary association, composed of lagoon, partial bay and barrier bar facies. To put together, the flood basin, interdistributary bay, abandoned channel, tidal flat-tidal channel of distfibutary channels provided favorable depositional environment for coal forming.