筠连地区晚二叠世乐平组沉积相与煤层气有利层位分析
Sedimentary Facies and Favorable Coal Seam Analysis of Leping Formation (Late Permian)in Junlian Area
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摘要: 通过对筠连地区(钻孔岩心和露头剖面)晚二叠世乐平组进行观察和对比,分析了地层发育特征、沉积相及其与煤层发育的时空关系,并从煤层发育的规模、厚度、稳定性等方面阐明了不同类型煤层的产气潜力。结果表明:研究区晚二叠世乐平组自下而上,年代地层限于上二叠统吴家坪阶和长兴阶;岩石地层采用乐平组;沉积相类型由西到东属于近海平原相区、海岸相区,近海平原相区属于河湖-沼泽沉积体系;海岸相区为碳酸盐岩与碎屑岩混源障壁海岸沉积体系;煤层是河流、湖泊沼泽化和潮坪、潟湖沼泽化的产物,有利的沉积相带为距离康滇古陆一定距离的河湖-沼泽相;川南的C7+C8煤层对应于黔西北的M16和M18煤层及滇东北的C5+C6煤层,为研究区分布稳定和最具煤层气勘探潜力的主力煤层。Abstract: The paper studied on the stratigraphic characteristics, sedimentary facies, and the relationship between the sedimentary facies and coal accumulation through the observation and description of the drilling cores and outcrop sections of Leping Formation (Late Permian) in Junlian area. The gas production potential of different types of coal seams was illustrated from the aspects of coal seam development scale, thickness and stability. The results show that: chronostratigraphy is limited to Wuchiapingian Stage and Changhsingian Stage; lithostratigraphy is Leping Formation with lower and upper members in ascending order; two types of facies provinces are developed, the offshore plain and coastal facies province from west to east. The former belongs to the meandering river-lake-swamp sedimentary system, and the latter is a mixed source barrier coastal sedimentary system of carbonate and clastic rocks. The main coal seams C7+C8 and other coal seams are the swamping result of river, lake, tidal flat and lagoon. The favorable facies belt is river-lake-swap with certain distance away from Kangtien old land. The paper proposed that the coal seams C7+C8 in south of Sichuan Province, corresponding to M16 and M18 in the northwest of Guizhou Province and C5+C6 in the northeast of Yunnan Province, are the favorable coal measures with stable and large-scale distribution.
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