嘉荫盆地太平林场组巴尔姆孢（Balmeisporites）的发现及其意义

2001年在嘉荫盆地太平林场组暗色泥岩中,发现油气显示,是大庆油田外围探区中第二个重点勘探的盆地。本次工作在太平林场组的建组剖面下部泥岩中首次发现丰富的大孢子化石—巴尔姆孢(Balmeisporites),见有3个种和2个未定种,其中新种2个,它们是:康氏巴尔姆孢(比较种)Balmeisporites cf.kondinskayae Srivastava et Binda、嘉荫巴尔姆孢(新种)Balmeisporites jiayinensis sp.nov.、太平林场巴尔姆孢(新种)Balmeisporites taipinglinchangensis sp.nov.、巴尔姆孢?(未定种 1)Balmeisporites?sp.1、巴尔姆孢?(未定种 2)Balmeisporites?sp.2。这一发现丰富了太平林场组建组剖面的生物化石内容,对嘉荫盆地井下岩石地层单元与露头剖面的对比提供了重要依据,所发现的巴尔姆孢均是不具赤道突起的类型,反映出典型晚白垩世的特征,本组产出的孢粉、介形类和叶肢介化石可与松辽盆地嫩江组对比,为晚白垩世桑顿期-坎潘期。巴尔姆孢指示的古气候应为潮湿的亚热带气候,产巴尔姆孢的层位所处的古环境应是河流入湖处的三角洲前缘或前三角洲的部位。

The Discovery of Balmeisporites and Its Significance of Taipinglinchang Formation in Jiayin Basin, Heilongjiang

Indications of oil and gas have been found in the mudstone of Taipinglinchang formation in Sunwu-Jiayin basin which is the second important basin for exploration outside Daqing oil field in 2001. Abundant Balmeisporites including Balmeisporites cf. kondinskayae Srivastava et Binda, Balmeisporites jiayinensis sp. nov. , Balmeisporites taipinglinchangensis sp. nov. , Balmeisporites?sp. 1 and Balmeisporites?sp. 2, have been found for first time in the mudstone lower Taipinglinchang Formation. The discovery is abundant of fossils in the section that Taipinglinchang Formation was established, and provides important basis for correlation of lithologic stratum units and outcrop sections. The Balmeisporites being not type with the equator processes show typical characteristics of Later Cretaceous. The fossils of Spore-pollen, Ostracoda and conchostracans being Later Cretaceous Santoian-Campanian in the formation can be correlated to that of Songliao basin. Palaeoclimate indicated by the Balmeis parties was moist subtropics, and palaeoenvironment of stratum including Balmeisporties was delta front or prodelta.