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梨树断陷位于松辽盆地南部,对微体古生物特征的研究能为断陷地层划分对比提供重要依据。此次研究重点分析了2口井(SW110井和LS1井)的古生物特征,发现梨树地区白垩纪断陷层微体生物化石种类丰富,其中藻类5种属、蕨类植物孢子18种属、裸子植物花粉13种属、被子植物花粉2种属、介形虫类化石12种属。梨树断陷层划分为三个组,自下而上为沙河子组,营城组,登娄库组。从沙河子组到登娄库组,蕨类植物逐渐减少,裸子植物花粉逐渐增多,被子植物花粉到登娄库时期才大量出现,因此被子植物花粉的富集能指示登娄库组。登娄库组处于亚普第期,孢粉组合为:棒纹粉属(Clavatipollenites)-桫椤孢属(Cyathidites)-克拉梭粉属(Classopollis)-苏铁粉属(Cycadopites),能与松辽盆地北部及安达地区登娄库组进行对比;
The Lishu Fault Depression is located in the southern part of Songliao Basin. The study on the paleontology features of microtitre can provide an important basis for the comparison and division of faulted strata. The study mainly analyzed the paleontological characteristics of two wells (Well SW110 and Well LS1) and found that there are abundant microfossil fossils in the Cretaceous fault zone in the Lishu area. Among them, five species of algae, 18 species of fern spores, 13 species of gymnosperm pollen, 2 species of angiosperm pollen and 12 species of ostracod fossils. The pear tree fault zone is divided into three groups, which are Shahezi Formation, Yingcheng Formation and Denglouku Formation from bottom to top. From Shahezi Formation to Denglouku Formation, the number of ferns gradually decreased and the number of pollen of gymnosperms increased gradually. However, pollen of angiosperms appeared only in large quantities in Denglouku period. Therefore, the pollen of angiosperm could indicate Denglouku Formation. The Denglouku group is in the phase of Acppartion. The sporopollen assemblages are: Clavatipollenites-Cyathidites-Classopollis-Cycadopites, The comparison between Denglouku Formation in the north and Anda region;