松南15井微古组合及其地层意义

MICROPALAEONTOLOGICAL ASSEMBLAGES IN SONGNAN WELL NO.15 AND STRATIGRAPHICAL SIGNIFICANCE

裘松余

Qiu Songyu

地矿部吉林石油普查指挥所

Jilin Headquaters of Petroleum Prospecting and Exploration, Ministry of Geology and Mineral Resources

最近,笔者在吉林省怀德县松南15井嫩一段和青山口组获得了丰富的孢粉、轮藻和介形类化石,对它们进行了详细研究。其中,又以孢粉化石尤为丰富,可划分为一个亚组合带和1个组合带,自下而上依序如下: 1.Schizaeoisporites—Tricolpollenites组合带。2.Proteacidites—Schizaeoisporites亚组合带。嫩一段为Proteacidites—Schizaeoisporites所代表的地层。Schizaeoisporites-Trico-lporopllenites组合带代表了青山口组沉积。这两个孢粉组合为划分对比地层和识别地震反射波组提供了可靠的生物地层学依据。据此,重新划分了地层并修正了地震反射波组(见表2)。

In recent year, the author has obtained a lot of sporopollen, Charaphy-ta, and Ostracoda from the first member of Nenjiang Formation and the Qi-ngshankou Formation in Songnan Well No.15 located in the Huaide County, Jilin Province, and carried out a detailed study on them.Among the fossils, the sporo-pollens are especially rich, which may be divided into an assemlage sub/one and an assemblage zone, in ascending order as follows: l.Schizaeoisporites-Tricolporopollenites assemblage zone 2.Proteacidites-Schizaeoisporites assemblage subzone The first member of Nenjiang Formation is the representative strata of Proteacidites-Schizaeoisporites assemblage subzone.The Schizaeoisporites-Tricolporopollenites assemblage zone represents the strasa of the Qingshan-kou Formation.The two sporo-pollen assemblages provided the reliable bi-ostratigraphical basis for dividing and correlation of strata and distinguishing the suite of seismic reflection wave, on which the strata in Songnan Well No.15 were redivided and the suite of seismic reflection waves was revised(see table 2).

https://doi.org/10.11781/sysydz199102185