马依西勘探区含煤地层岩相及沉积环境分析

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

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。

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.