The coal No.11 has directly deposited on tidal flat and tidal flat sandbar uplifted basement;coal No.9 also developed on del-ta front uplifted area.Since long coal-forming duration has caused large coal thickness .Thickest coal seams have developed in mine-field eastern part, thin coal belt situated in southeast corner of the study area .Coal No.8 and No.10 are all local splits of coal No.9 during the sedimentation , while the bifurcation directing on sand body and sea , thus the coal No.9 should be deposited on an island . Coal No.4 -1 was deposited on an alluvial plain with terrestrial environment .%11号煤层直接沉积在潮坪和潮坪砂坝的隆起基底上,9号煤层亦发育在三角洲前缘的隆起区,成煤时间长,煤层厚度大,井田东部煤层最厚,薄煤带位于研究区南东角.8号和10号煤层为9号煤层在沉积过程中的局部分叉,而且分叉指向砂体和海,故9号煤层为岛状成煤条件.4-1号煤层沉积在冲积平原的陆相环境.
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