本文選題：遼西南凹陷東　切入點(diǎn)：營(yíng)組　出處：《成都理工大學(xué)》2017年碩士論文

【摘要】：論文將遼西凹陷南部(即遼西南凹陷)作為研究地區(qū),對(duì)古近系東營(yíng)組的層序及砂體分布做出研究。在對(duì)鉆井進(jìn)行巖芯觀察及物探資料(測(cè)井資料及地震資料等)的解釋基礎(chǔ)之上,以沉積巖石學(xué)、層序地層學(xué)、沉積充填動(dòng)力學(xué)、古生物學(xué)、沉積地球化學(xué)、測(cè)井地質(zhì)學(xué)、地震地層學(xué)以及構(gòu)造地質(zhì)學(xué)等原理為理論依據(jù),對(duì)研究區(qū)內(nèi)的古近系東營(yíng)組進(jìn)行了巖石組合、生物組合、沉積結(jié)構(gòu)、剖面序列、沉積機(jī)理等特征的分析。本文對(duì)相同沉積時(shí)期條件下的橫向上及相同沉積位置垂向上的沉積特征做出了分析并進(jìn)行了對(duì)比。本文對(duì)研究區(qū)內(nèi)古近系東營(yíng)組中主要的三種沉積體系——湖泊、辮狀河三角洲、近岸水下扇,做出了分析。并在對(duì)沉積相的分析基礎(chǔ)之上,綜合對(duì)測(cè)井資料及地震剖面資料的分析結(jié)果,根據(jù)層序地層學(xué)原理,參照研究區(qū)現(xiàn)有研究狀況,將研究區(qū)東營(yíng)組劃分為三個(gè)三級(jí)層序——東營(yíng)組三段層序(SQd_3)、東營(yíng)組二段層序(SQd_2)、東營(yíng)組一段層序(SQd_1)。其中東營(yíng)組三段層序以半深湖相沉積為主。至東營(yíng)組二段層序,研究區(qū)逐漸轉(zhuǎn)為以辮狀河三角洲相沉積為主,見有少量濱淺湖相沉積。到東營(yíng)組三段沉積時(shí)期,研究區(qū)則幾乎少見湖湘沉積,多見多期辮狀河三角洲疊置沉積。反映了研究區(qū)在東營(yíng)組沉積過程中,經(jīng)歷了從東營(yíng)組三段沉積期遼東灣盆地在快速斷裂期的背景下,盆地面積增大,多發(fā)育湖泊;到快速斷裂期晚期構(gòu)造活動(dòng)漸緩的轉(zhuǎn)變,盆地沉降作用漸弱,同時(shí)西面來(lái)自六股河巖漿巖、變質(zhì)巖混合物源區(qū)和大石河巖漿巖物源區(qū)的物源充足的情況下,由湖泊向辮狀河三角洲沉積的演化過程。研究區(qū)主要接受西部的六股河巖漿巖、變質(zhì)巖混合物源區(qū)和大石河巖漿巖物源區(qū)的物源,選取物源方向水平方向和垂直方向,建立了高分辨率層序地層格架。在層序地層分析的基礎(chǔ)上,運(yùn)用層序充填動(dòng)力學(xué)思想,詳細(xì)討論了在湖平面、A/S比值變化、層序界面旋回、古地貌及斷層,5個(gè)因素的控制作用下,對(duì)研究區(qū)層序內(nèi)部砂體展布的特征進(jìn)行了討論。
[Abstract]:In this paper, the southern part of the western Liaoning sag (that is, the southwest Liaoning depression) is regarded as the research area. The sequence and sand body distribution of Dongying formation in Paleogene are studied. On the basis of core observation and interpretation of geophysical data (logging data, seismic data, etc.), sedimentary petrology, sequence stratigraphy and sedimental-filling dynamics are used. Based on the principles of paleontology, sedimentary geochemistry, logging geology, seismic stratigraphy and tectonic geology, the rock assemblages, bioassemblages, sedimentary structures and profile sequences of the Dongying formation of the Paleogene in the study area have been carried out. Analysis of sedimentary mechanism and other characteristics. This paper analyses and compares the vertical sedimentary characteristics of the same sedimentary period and the same sedimentary position. The main features of Dongying formation of Paleogene in the study area are discussed in this paper. Lakes, The braided river delta, the nearshore underwater fan, is analyzed. On the basis of the analysis of sedimentary facies, the results of well logging and seismic profile data are synthetically analyzed. According to the principle of sequence stratigraphy, the present research situation in the study area is referred to. The Dongying formation in the study area is divided into three third-order sequences-the third member of the Dongying formation, the third member of the Dongying formation, SQdS3, the second member of the Dongying formation, the second member of the Dongying formation, the sequence SQD _ 2, and the first member of the Dongying formation, the sequence of which is mainly composed of semi-deep lacustrine facies deposits, and the sequence to the second member of the Dongying formation, the first member of the Dongying formation, is mainly composed of semi-deep lacustrine facies. The study area gradually changed to braided river delta facies, and a small amount of littoral shallow lacustrine facies was found. In the third member of Dongying formation, Huxiang sediments were almost rare in the study area. There are many braided river delta superimposed deposits in the study area, which shows that in the process of Dongying formation, the Liodong Bay basin in the third member of Dongying formation experienced rapid fault period, the area of the basin increased and lakes developed. With the gradual change of tectonic activity in the late period of rapid faulting, the subsidence of the basin becomes weaker, and in the case of abundant sources from Liukuhe magmatic rock, metamorphic rock mixture source area and Dashihe magmatic source area to the west, The evolution process from lake to braided river delta. The study area mainly accepts the provenance of Liukuhe magmatic rock, the source region of metamorphic rock mixture and the source area of Dashihe magmatic rock, and selects the horizontal and vertical direction of the source. The high-resolution sequence stratigraphic framework is established. On the basis of sequence stratigraphic analysis and using the idea of sequence filling dynamics, it is discussed in detail under the control of five factors, such as the change of A / S ratio in the lake plane, the sequence interfacial cycle, paleogeomorphology and faults, and the control of five factors. The distribution characteristics of sand bodies in the study area are discussed.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13

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