嘉禾袁家矿区龙潭组含煤建造沉积环境的商榷

DISCUSSION ABOUT THE SEDIMENTARY ENVIRONMENT OF LONGTAN FORMATION COAL-BEARING FORMATION IN YUANJIA MINE,JIAHE

嘉禾袁家矿区上二叠统龙潭组含煤建造,并非泻湖—潮坪体系环境。而是一个较完整的三角洲体系,即建造的下段和上段的中、下部为三角洲海退(进积型)序列;建造的上段为三角洲海进(退积型)序列。建造中的6煤层,属下三角洲平原环境堆积,煤层厚带与底砂体的中等厚带相互重叠对应;建造中的2、5煤层,属上三角洲平原环境堆积,煤层厚带与底砂体的薄带(或无砂区)相互重叠对应。以上聚煤规律的查明,对煤田普查勘探、煤矿井的设计和生产,都具有指导意义。

The coal-bearing formation of Upper Permian Longtan Formation in Yuanjia mine, Jiahe county, is not formed in lagoon-tidal flat system, but shows a relatively complete delta depositional system, in which the low er member and the middle,upper parts of the upper member belong to the transgression sequence, whereas the upper Part of the upper member belongs to regression sequence. The No.6coal seam of the coal-bearing formation is considered to have formed in lower delta plain environment, its thick zone corresponding to the mediumly thick zone of the basal sand mass; while the No.2 and No.5 coal seams indicata an upper delta plain environment, their thicker zones corresponding to the thinner zones of the basal sand mass(or the section without sand mass). The above coal-forming law is of great guiding significance for the exploration and prospecting of coalfield, for the designing and production of coal mine.