本文關(guān)鍵詞：寧南—六盤山地區(qū)延安期原盆恢復(fù)　出處：《西北大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 寧南-六盤山地區(qū) 延安期 物源分析 構(gòu)造格局 原盆恢復(fù)

【摘要】：原盆恢復(fù)即剔除后期改造的影響,恢復(fù)盆地主要發(fā)育時期和演化階段的原始面貌特征,它是沉積盆地分析的重要內(nèi)容,也是目前沉積盆地研究的難點和重點。原盆恢復(fù)的研究對探討沉積盆地演化及能源礦產(chǎn)資源勘探等意義重大。本論文選擇鄂爾多斯盆地西部寧南-六盤山地區(qū)為研究區(qū),以研究程度相對薄弱的早-中侏羅世延安組為重點層段。在“原盆恢復(fù)”理論的指導(dǎo)下,以大量野外露頭剖面、油田、煤田資料及相關(guān)分析測試為基礎(chǔ),綜合運用沉積學(xué)、構(gòu)造學(xué)法、地球化學(xué)、地球物理等相關(guān)理論與技術(shù)方法,對延安組的地層時代劃分、展布、沉積環(huán)境及原始沉積邊界進行了系統(tǒng)剖析,結(jié)合周鄰?fù)诘刭|(zhì)特征探討了延安期原始盆地面貌,主要取得了以下進展和認識：(1)重新厘定了研究區(qū)炭山、窯山、麻黃溝等地區(qū)具“上三疊統(tǒng)\中下侏羅統(tǒng)”之爭的煤系地層時代,將其時代歸為早-中侏羅世。(2)揭示了研究區(qū)延安期發(fā)育多個沉積-沉降中心,地層展布總體呈西厚東薄的趨勢。西部六盤山地區(qū)延安組沉積受多條斷裂控制,凹陷呈多列串珠狀排列,沉積厚度大,遠大于鄂爾多斯西緣及周緣山間盆地同期地層。(3)物源綜合分析結(jié)果表明,研究區(qū)延安期物源主要來自北部陰山地塊和西北部阿拉善古陸,南部秦嶺和西南部北祁連構(gòu)造帶貢獻相對較小。(4)指出前侏羅紀研究區(qū)遭受西強東弱的構(gòu)造變動事件,延安組沉積之初研究區(qū)發(fā)育多個隆起,地貌起伏不平。延安期總體處于弱伸展環(huán)境,斷裂對沉積作用控制明顯。(5)原始盆地邊界西南海原斷裂為界與北祁連隆起相鄰,西北以中寧-中衛(wèi)斷裂和賀蘭山西麓斷裂分別與衛(wèi)寧北山古隆起和阿拉善古陸相鄰,北部邊界可達陰山-河套古隆起,東、西分別與鄂爾多斯盆地河西走廊相連通。(6)延安期初期,研究區(qū)隆凹相間,以河流沖積體系為主,僅祁連山前緣發(fā)育多個小型淺湖,河流最終匯入之東的甘陜古河；盆地發(fā)育鼎盛時期,印支期古隆起不復(fù)存在,盆內(nèi)斷陷作用加強,小型湖泊擴張成一大型斷陷湖盆,受鄂爾多斯盆地大型湖泊擴張的影響,早期的河流沉積體系演變?yōu)楹恿?三角洲沉積體系。
[Abstract]:The original basin restoration is to exclude the influence of the later transformation, and to restore the original features of the main development and evolution stages of the basin, which is an important content of the sedimentary basin analysis. The study of basin restoration is of great significance to the exploration of sedimentary basin evolution and exploration of energy and mineral resources. In this paper, the western Ningnan-Liupanshan area of Ordos basin is selected as the. Research area. Under the guidance of the theory of "original basin restoration", based on a large number of outcrop profiles, oilfield and coalfield data, and related analysis and tests, this paper takes the relatively weak early and Middle Jurassic Yanan formation as the key formation. Based on the relevant theories and techniques of sedimentology, tectonics, geochemistry and geophysics, the stratigraphic epoch division, distribution, sedimentary environment and original sedimentary boundary of Yan'an formation are systematically analyzed. The features of Yanan primitive basin are discussed in the light of the geological characteristics of the same period in the neighboring region. The following progress and understanding are obtained.) the study area of carbon Mountain and Kiln Mountain is redetermined. In Mahuanggou and other areas, there is a "Upper Triassic / Middle and Lower Jurassic" Coal-bearing Strata era, which is classified as Early-Middle Jurassic. 2) it is revealed that there are many sedimental-subsidence centers developed in Yanan period of the study area. The deposition of Yan'an formation in the western Liupanshan area is controlled by many faults and the sag is arranged in a series of beads with a large thickness. The results show that the Yanan period provenance in the study area is mainly from the Yinshan block in the north and the Alashan paleocontinent in the northwestern part of the study area. The contribution of the southern Qinling and the southwestern North Qilian tectonic belt is relatively small. It is pointed out that the study area of the pre-Jurassic was subjected to the tectonic changes of the west, strong, east and weak, and several uplifts were developed in the study area at the beginning of the Yanan formation. The Yanan period is in a weak extensional environment, and the faults control the sedimentary process obviously. 5) the margin of the primitive basin boundary is adjacent to the North Qilian uplift. In the northwest of China, Zhongning-Zhongwei fault and Helan mountain western foot fault are adjacent to the ancient uplift and Alashan ancient land of Weining North Mountain, respectively, and the northern boundary can reach Yinshan-Hetao ancient uplift, east. In the early Yanan period, the study area consists of river-alluvial system, and only several small shallow lakes are developed in the front edge of Qilian Mountains. The river eventually flows into the ancient Ganshan River to the east; At the peak of the basin development, the Indosinian paleouplift ceased to exist, the intrabasin faulting was strengthened, and the small lakes expanded into a large faulted lake basin, which was influenced by the large lake extension in the Ordos Basin. The early fluvial sedimentary system evolved into fluvial-delta sedimentary system.
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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