松辽盆地南部伏双大地区登娄库组孢粉组合特征研究及地质意义  

A study on characteristics of sporopollen assemblage of the Denglouku Formation in the Fushuangda Area,southern Songliao Basin and its geological significance

作　　者：宋立斌[1] 丛杉[2] 张艳[3] 万传彪[2] 裴警博 张梅生[3] SONG Libin;CONG Shan;ZHANG Yan;WAN Chuanbiao;PEI Jingbo;ZHANG Meisheng(Exploration and Development Institute of Jilin Oilfield Company,PetroChina,Jilin Songyuan 138000,China;Exploration and Development Institute of Daqing Oilfield Co.,Ltd.,PetroChina,Heilongjiang Daqing 163712,China;College of Earth Sciences,Jilin University,Changchun 130061,China)

机构地区：[1]中国石油吉林油田分公司勘探开发研究院,吉林松原138000 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]吉林大学地球科学学院,长春130061

出　　处：《非常规油气》2025年第2期11-24,共14页Unconventional Oil & Gas

基　　金：中国石油“十四五”油气资源评价项目“吉林油田探区“十四五”油气资源评价”(2023YQX20103)。

摘　　要：为了搞清楚松辽盆地南部伏双大地区登娄库组/段级地层单元的沉积相带展布,落实有利勘探区带,亟需在新的地层划分对比方案基础上开展沉积相研究工作。针对该区登娄库组/段级地层划分存在的分层混乱问题,在借鉴登娄库组标准井松基6井生物地层研究成果的基础上,对该区探井登娄库组碎屑岩中发现的孢粉化石进行了系统研究。结果表明:1)登娄库组自下而上4个段均发现了较丰富的孢粉化石,根据孢粉化石纵向上的变化规律,划分了4个孢粉组合,即登一段为“光面三缝孢-三角粒面孢-克拉梭粉”孢粉组合;登二段为“光面三缝孢-无突肋纹孢-杉粉”孢粉组合;登三段为“桫椤孢-隐孔粉-多孔粉”孢粉组合;登四段为“希指蕨孢-克拉梭粉-多孔粉”孢粉组合。2)对伏双大地区登四段进行了沉积微相研究,包括辫状河河道、辫状河河漫、曲流河河道、曲流河河漫和决口扇等5种沉积微相类型,提出曲流河河道为登四段有利勘探区带,建议部署3口预探井。该研究对伏双大地区天然气勘探具有重要的地质意义。In order to clarify the distribution of sedimentary facies units of Denglouku Formation/Member in Fushuangda Area of the southern Songliao Basin and to identify favorable facies exploration zones,sedimentary facies need to research based on the new stratigraphic division and correlation scheme.Addressing the formation confusion issue in the division of Denglouku Formation in this area.Sporopollen fossils were systematically studied in clastic rocks of Denglouku Formation in the exploration well of this area based on previous biostratum research results of Denglouku Formation in the standard well,well SJ6.The results indicate that:1)Abundant sporopollen fossils have been found in the four members of Denglouku Formation from bottom to top.Four sporopollen assemblages were identified based on the vertical variation patterns of the sporopollen fossils:K_1d_(1) is Leiotriletes-Granulatisporites-Classopollis assemblage,K_1d_(2) is Leiotriletes-Cicatricosisporites-Taxodiaceaepollenites assemblage,K_1d_(3) is Cyathidites-Cicatricosisporites-Exsipollentes Polyporites assemblage,and K_1d_(4) is Schzaeoisporites-Classopollis-Polyporites assemblage.2)Five sedimentary microfacies of K_1d_(4 )have been studied,including the channel and the floodplain of a braided river,the channel,the floodplain,and the crevasse splay of a meandering river.The meandering river channel of K_1d_(4) is favorable for exploration,and three exploration wells have been proposed accordingly.This study is of great geological significance for gas exploration in Fushuangda Area.

关 键 词：松辽盆地 伏双大地区 登娄库组 孢粉组合 地层划分 

分 类 号：P631[天文地球—地质矿产勘探]