山西寿阳矿区含煤岩系环境及聚煤特征

本区太原组和山西组为一套过渡环境的沉积.太原组为有障壁海岸沉积体系和三角洲沉积环境.区内主要煤层的聚煤特征为太原组中的15、9及8号煤层均为层位稳定.厚度较大的全区稳定可采煤层;山西组的6号煤层为层位较稳定.厚度有些变化的较稳定部分可系煤系.

THE SEDIMENTARY ENVIRONMENT AND COAL ACCUMULATION CHARACTERISTICS OF THE COAL BEARING SERIES IN SHOUYANG COAL FIELD，EAST SHANXI

The coal bed in Shouyang coal field was composed mainly of Taiyuan Group(C₃t) and Shanxi Group(P_ls) containing 9 to 14 seams. The abounded coal reserve of this region made itself one of the important bases of en- ergy. The Taiyuan Group in this district can be divided into five complete cycles of sequence. containing 6-8 coal seams, and was made up of light gray, dark gray and grayish black mudstone. siltpelite, carbonaceous mudstone. silt-stone. sandstone, limestone and coal seams. Aaording to the sedimentogaghy, the authors con- sidered environment that Taiyuan goup of this area belonged to the transitional environment deposite. The lower three cycles i.e.the 1st, 2nd. 3rd were built up of continental elastic debris tidal Ilat deposition under marine regression and lower intertidal carbonate under marine inundation, while the upper two cycles (the 4th and 5th) belonged to deltaic deposition. The Shanzi Group in this district containing 3-6 coal seams, consisted of gray and black mudstone, sandy mudstone, carbonaceous mudstone, ailtstone, sandstone and coal seams. On studying its sedimentation mechanism in detail. the authors proposed that the formation of Shanxi Group is not “purely continental”as been known before, but as deltaic deposition. It can also be divided into five cycles (the 6th. 7th, 8th, 9th and 10th) most of them represent developing deltaic deposition ezcept the cycle 6 which showed complete sequence of delta deposition The relationship between the depositional environment and the property of coal seams are as follows: The 15th. 13th, 12th and 11th coal seams. located at the lower three cycles of the Taiyuan Group, were deposited under tidal flat environment. The characteristics of this sequence can be described in following words; the formations below each coal seam belonged to sea ebb sequence its continental clastic debris represent tidal flat