【作者】 鲍俊驰；

【导师】 丛琳；

【作者基本信息】 东北石油大学 ， 矿产普查与勘探， 2021， 硕士

【摘要】 为了研究松辽盆地北部朝94区块杨大城子油层的沉积微相特征并指导油田的下一步开发,本文在松辽盆地北部朝阳沟地区区域地质背景研究下,以沉积岩石学、油气田开发地质学等理论知识为基础,结合岩心、测井、地震等资料,建立研究区等时地层格架,对研究区的物源方向及沉积微相进行研究,总结沉积微相的演化规律。研究结果表明:（1）综合运用岩心、测井等数据,以新完钻密闭取心井为基础,结合其它重点井对研究区地层进行划分,将研究区划分为22个小层47个沉积时间单元。在此基础上进行全区的小层对比,建立了等时地层格架。（2）在精细等时地层格架的控制下,结合前人研究成果,完成了研究区物源的综合分析,认为研究区杨大城子油层属物源交汇区,大面积为西南物源控制区。其中,杨Ⅲ、杨Ⅱ油层组重矿物组合类型均以绿帘石、柘榴子石或绿帘石、锆石为主,而杨I油层组的重矿物组合类型为绿帘石、磁铁矿及锆石。（3）以密闭取心井为基础,优选6种测井曲线识别出了研究区1相4亚相6微相,6种沉积微相分别为主体河道、非主体河道、废弃河道、主体溢岸砂、溢岸砂以及泛滥平原微相。（4）结合单井相、连井相的分析结果,对研究区沉积微相平面分布特征进行总结,识别出研究区主力沉积时间单元为杨Ⅰ7₁、杨Ⅰ7₂及杨Ⅱ5₂单元,根据不同河道类型对各沉积时间单元的平面沉积微相展布进行了描述,分析研究区河道发育情况:认为研究区内大部分河道呈近西南-东北向展布,河道数量较多,大部分沉积时间单元发育3条以上河道,河道最宽处能够达到2200m,最窄处能达到100m。（5）根据研究区沉积微相平面展布规律,结合砂体发育特征,对研究区沉积微相垂向演化规律进行分析,认为:研究区在沉积演化过程中水体能量动荡不安,河道方向频繁摆动,河道规模及数量不断发生变化,从而导致了研究区砂体发育情况复杂。通过研究区沉积微相的研究及沉积微相演化规律的分析,为进行下一步开发措施提供了有利依据,也为今后确定优势储层“甜点”区提供了有效帮助,对研究区的油气勘探具有重要意义。更多还原

【Abstract】 In order to study the sedimentary microfacies characteristics of the Yangdachengzi oil layer in the Chao 94 block in the northern Songliao Basin and to guide the next development of the oil field,under the research of regional geological background in Chaoyanggou area in the northern Songliao Basin,based on theoretical knowledge of sedimentary petrology and oil and gas field development geology,combined with core,logging,seismic and other data,establish an isochronous stratigraphic framework in the study area,the provenance direction and sedimentary microfacies of the study area are studied,and the evolution law of sedimentary microfacies is summarized.The research results show that:（1）Comprehensive use of core,well logging and other data,based on newly completed closed core wells,combined with other key wells to classify the study area,the study area is divided into 22 small layers and 47 sedimentary time units.On this basis,a small layer comparison of the whole area was carried out,and an isochronous stratigraphic framework was established.（2）Under the control of the fine isochronous stratigraphic framework,combined with previous research results,a comprehensive analysis of the provenance of the study area was completed.It is believed that the Yangdachengzi oil layer in the study area is a provenance confluence area,and a large area is a southwestern provenance control area.Among them,the types of heavy mineral assemblages in the Yang III and Yang II oil-bearing formations are mainly epidote,garnet or epidote,and zircon,while the heavy mineral assemblages of the Yang I oil-bearing formation are epidote,magnetite and zircon.（3）Based on the closed coring wells,6 types of logging curves were selected to identify1 facies,4 subfacies and 6 microfacies in the study area.The 6 sedimentary microfacies are the main channel,non-main channel,abandoned channel,main overflow sand,overflowing sand and floodplain microfacies.（4）Combining the analysis results of single-well facies and connected-well facies,the plane distribution characteristics of sedimentary microfacies in the study area were finely described,and the main sedimentary time units in the study area were identified as Yang I7₁,Yang I7₂,and Yang II5₂.The distribution of the plane sedimentary microfacies of the depositional time unit is described,and the development of the river channels in the study area is analyzed:it is believed that most of the river channels in the study area are distributed in a southwest-northeast direction,with a large number of channels,and most of the deposition time units have developed at least 3 There are more than one river course,the widest part of the river course can reach 2200m,and the narrowest part can reach100m.（5）According to the plane distribution law of sedimentary microfacies in the study area,combined with the development characteristics of sand bodies,the vertical evolution law of sedimentary microfacies in the study area is analyzed,and it is concluded that:During the process of sedimentary evolution in the study area,the energy of the water body was turbulent,the direction of the river channel fluctuated frequently,and the scale and quantity of the river channel were constantly changing,which led to the complex development of sand bodies in the study area.Through the study of sedimentary microfacies in the study area and the analysis of the evolution of sedimentary microfacies,it provides a favorable basis for the next development measures,and also provides effective help for determining the"sweet spot"area of advantageous reservoirs in the future,it is of great significance to the oil and gas exploration in the study area.更多还原