【作者】 张立斌；

【导师】 高有峰；

【作者基本信息】 吉林大学 ， 矿物学、岩石学、矿床学， 2019， 硕士

【摘要】 松辽盆地大陆科学钻探松科2井位于松辽盆地北部,徐家围子断陷宋站鼻状构造中,松科2井钻遇的地层自下而上分别为古生界基底,下白垩统沙河子组（K₁sh）、营城组（K₁y）、登娄库组（K₁d）,上白垩统的泉头组（K₂q）、青山口组（K₂qn）、姚家组（K₂y）、嫩江组（K₂n）、四方台组（K₂s）、明水组（K₂m）,以及第四系沉积物（Q）。本文从松科2井地层分层现状出发,恢复其埋藏史,这对盆地演化以及油气勘探开发都具有重要意义。松科2井取心段为登娄库组-基底,登娄库组以上的地层根据松科2井岩屑录井资料得出。通过对松科2井全井段岩心的观察、描述与分层,以及薄片的制作、观察与鉴定,将松科2井钻遇的不同地层进行岩性比例的详细划分,进行地层压实校正,从而得到每一地层的碎屑颗粒骨架厚度;对于其中火山岩的处理则通过结合长白山地区地表未经压实作用的火山岩与松科2井营城组火山岩,进行覆压孔渗测试后,得出适用于松科2井的火山岩孔-深计算关系;通过岩心资料,可以看出在松科2井中出现有两个主要的不整合界面,分别为嫩江组顶面和营城组顶面,本文分别利用声波时差测井资料结合前人研究成果,确定剥蚀量分别为851 m和654.45 m;对于沙河子组的底界年龄,进行LA-ICP-MS U-Pb测年得出为118.6 Ma;利用分段回剥原理,最终确定松科2井单井埋藏史。通过松科2井单井埋藏史的恢复和沉积速率的特征,松科2井在沙河子组—营城组时期,发生长时间快速的沉积和埋藏,沉积速率分别为460.35 m/Ma和186.22m/Ma;营城组末期地层抬升剥蚀,剥蚀量为654.45 m;下白垩统登娄库组—上白垩统泉头组时期再次进入快速沉积埋藏阶段,沉积速率分别为120.62 m/Ma和101.77m/Ma;到上白垩统青山口组—姚家组时期,沉积埋藏速率略有下降,但整体依然处于较快速的沉积和埋藏,沉积速率分别为52.24 m/Ma和72.94 m/Ma;上白垩统嫩江组发生短时间大厚度的快速沉积和埋藏,沉积速率达到了216.25 m/Ma,到嫩江组末期地层回返转为快速的抬升剥蚀,产生了巨大的剥蚀量,剥蚀厚度851 m;上白垩统四方台组—第四系时期,地层整体处于缓慢沉积和埋藏,沉积速率和埋藏速率明显变小。更多还原

【Abstract】 SKⅡ Well of the Continental Scientific Drilling in the Songliao Basin is located at the Song Station nose-like structure of the Xujiaweizi depression,north of the Songliao Basin.The strata encountered from the bottom to the top are the basement of the Paleozoic,Lower Cretaceous Shahezi Formation（K₁sh）,the Yingcheng Formation（K₁y）,the Denglouku Formation（K₁d）,and the Upper Cretaceous Quantou Formation（K₂q）,the Qingshankou Formation（K₂qn）,the Yaojia Formation（K₂y）,the Nenjiang Formation（K₂n）,the Sifangtai Formation（K₂s）,the Mingshui Formation（K₂m）,and the Quaternary（Q）.We restores burial history of the SKⅡ Well by its current situation of stratigraphic stratification,which is significant to basin evolution and oil-gas exploration.The core section of SKⅡ Well is taken from basement to the Denglouku Formation,while the strata above the Denglouku Formation are based on the cutting logging data.The lithology proportions of the different strata encountered in the SKⅡ are divided into detailed sections for the formation compaction correction obtain the debris particle skeleton thickness of each strata through the observation,description and stratification of the core,and the production,observation and identification of the several slices.For the volcanics,we obtain the valcanics hole-deep corelationship applicable to the SKⅡ by taking the pressure hole permeability test which is subjected to the uncompacted volcanics in the Changbai Mountain area and the Yingcheng Formation volcanics.Through the core data,it is clearly that there are two main unconformity interfaces in the SKⅡ,which are the top surface of the Nenjiang Formation and the Yingcheng Formation.Using the interval transit time log data combined with previous research results,the denudation thickness was determined to be 851 m and 654.45 m.The bottom boundary age of the Shahezi Formation was determined to be 118.6 Ma by LA-ICP-MS U-Pb,and the burial history of SKⅡ was finally determined by the principle of backstripping.According to the recovery of burial history and characteristics of sedimentation rate,SKⅡ underwent long-term and rapid depositon and burial during the Shahezi Formation-Yingcheng Formation period,with sedimentation rates of 460.35 m/Ma and186.22 m/Ma.Strata uplifted and denuded at the end of Yingcheng Formation with denudation thickness of 654.45 m.The sedimentary rate was 120.62 m/Ma and 101.77m/Ma during the period of Denglouku Formation of Low Cretaceous and Quantou Formation of Upper Cretaceous.During the period of Qingshankou Formation-Yaojia Formation of Upper Cretaceous,the sedimentary burial rate decreased slightly,but the overall sedimentary rate was still relatively fast,which are 52.24 m/Ma and 72.94 m/Ma.Rapid depositon and burial occurred in Nenjiang Formation of Upper Cretaceous,with a depositon rate of 216.25 m/Ma.The strata returned to rapid uplift and denudation at the end of Nenjiang Formation,resulting in a huge amount of denudation with a denudation thickness of 851 m.During the Upper Cretaceous Sifangtai Formation-Quaternary period,the strata were deposited and buried slowly as a whole,and the sedimentation rate and burial rate were obviously reduced.更多还原