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xiang zhong zao shi tan shi wan qi you kong chong qun ji qi di ceng yi yi
Pages: 177-183
Year: Issue:  2
Journal: Oil & Gas Geology

Keyword:  早石炭世晚期组合带有孔虫群地层意义有孔虫化石有孔虫组合梓门桥组韦宪期湘中地区大塘阶;
Abstract: In recent years,the writers have obtained a lot of foraminiferal fossils fromthe late Early Carboniferous(Datang Stage)in the Liangyuan-Shaoyang re-gion of central Hunan Province and carried out a detailed stuty on them.Based on their character,3 foraminiferal assemblage zones can be establishedin an ascenting order:1.Dainella gumbeica-Plectogyra posneri assemblage zone;2.Eodiscus-Lituotubella glomospiroides assemblage zone;3.Endothyranopsis crassus-Archaediscus krestovnikovi assemblage zone.Among them,the,Zimenqiao Group is the representative deposit ofEndothyranopsis crassus-Archaediscus krestovnikovi assemblage zone;the othertwo zones represent respectively the deposits of upper or lower part ofShidengzi Group(see fig.1).The foraminiferal of the Datang Stage shows obviously the aspect of thelater Early Garboniferous System and is similar to that of the Visean Stage inMoscow Basin of Soviet Union.It should be stressed that the Shidengzi Group is not only a comparativelyfavorable reservior rocks,but also a fine source rocks.In addition,the coal-(?)earing beds of Ceshui Group and the gypsiferous beds of Zimenqioa Groupare excellent covers.Therefore,in comparison with the other conditions asconcerning the combination of source-reservior-cap rocks in present region,the Datang Stage should be a considerably favorable oil gas bearing beds.
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