本文選題：關(guān)中盆地 + 古近系�。� 參考：《西安石油大學(xué)》2015年碩士論文

【摘要】：關(guān)中盆地夾持于鄂爾多斯地臺與秦嶺造山帶之間,是在燕山期隆起之上形成的伸展型斷陷盆地。自中新生代以來,盆地長期處于特殊的地質(zhì)構(gòu)造應(yīng)力場中,構(gòu)造復(fù)雜,斷裂發(fā)育,且長期處于不均衡沉降中,造成地層沉積厚度較大,南北分異明顯,沉積環(huán)境、巖性組分變化復(fù)雜。本文運用沉積學(xué)、古地理學(xué)、構(gòu)造學(xué)及石油地質(zhì)學(xué)等理論,在野外地質(zhì)調(diào)查及地化分析資料的基礎(chǔ)上,深入分析已有測井、地震資料,綜合前人研究成果,系統(tǒng)地對關(guān)中盆地古近系沉積特征、構(gòu)造特征及古地理特征進行了研究。研究表明:古近系地層具有近物源的特點,分布在不同位置的充填沉積物屬于多物源沉積體系:來自秦嶺山前的沖積扇沉積,以粗碎屑沉積物為主,粒度累積概率曲線主要為兩段式,孔隙發(fā)育,結(jié)構(gòu)疏松,分選中等;來自盆地北部隆起區(qū)的地層,沉積物由河流及洪積扇組成,碎屑顆粒粒度相對較細(xì)。關(guān)中盆地沉積相特征、古地理特征及其變化規(guī)律是隨著盆地的演化而發(fā)生轉(zhuǎn)變的,本文以地球物理學(xué)標(biāo)志為主要依據(jù),結(jié)合巖石學(xué)標(biāo)志和沉積構(gòu)造標(biāo)志,在區(qū)域沉積構(gòu)造背景下,可將研究區(qū)古近系劃分為2個主要沉積體系。古近紀(jì)初期,紅河組在水動力較強、水體動蕩的環(huán)境下沉積,以洪積、坡積相為主;至早漸新世,發(fā)育以河湖相沉積為主的白鹿塬組,巖性主要為灰白色塊狀砂巖夾棕紅色泥巖;到古近紀(jì)末期,盆地發(fā)生二次隆升,形成不整合。
[Abstract]:The Guanzhong basin lies between the Ordos platform and the Qinling orogenic belt and is an extensional faulted basin formed on the Yanshanian uplift. Since the Mesozoic and Cenozoic, the basin has been in the special geological structure stress field for a long time, the structure is complex, the fault is developed, and is in the unbalanced subsidence for a long time, which results in the formation deposition thickness is large, the north-south differentiation is obvious, the sedimentary environment is obvious. The variation of lithologic composition is complex. Based on the theories of sedimentology, paleogeography, tectonics and petroleum geology, and on the basis of field geological survey and geochemical analysis data, the existing logging and seismic data are deeply analyzed, and the results of previous studies are synthesized. The sedimentary, tectonic and paleogeographic characteristics of Paleogene in Guanzhong Basin are systematically studied. The results show that Paleogene strata have the characteristics of near-provenance, and the filling sediments distributed in different positions belong to multi-source sedimentary system: alluvial fan deposits from the front of Qinling Mountains, mainly coarse clastic sediments. The cumulative probability curve of grain size is mainly two-segment, pore development, loose structure and medium separation. The sediments from the northern uplift area of the basin are composed of rivers and alluvial fans, and the grain size of clastic grains is relatively fine. The sedimentary facies, paleogeography and its variation in Guanzhong Basin change with the evolution of the basin. This paper is based on geophysical markers, combined with petrological and sedimentary structural markers. Under the background of regional sedimentary structure, Paleogene can be divided into two main sedimentary systems. In the early Paleogene, the Honghe formation was deposited in a strong hydrodynamic and turbulent water environment, mainly in the alluvial and slope facies, and in the early Oligocene, the Bailuyuan formation, which was dominated by the fluvial and lacustrine facies, was formed in the early Oligocene. The lithology is mainly grayish-white block sandstone with brown red mudstone, and by the end of Paleogene, the basin has two uplift and unconformity.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P534.6;P512.2

【參考文獻】

相關(guān)期刊論文 前7條

1 李繼亮,肖文交,閆臻;盆山耦合與沉積作用[J];沉積學(xué)報;2003年01期

2 解習(xí)農(nóng),李思田;陸相盆地層序地層研究特點[J];地質(zhì)科技情報;1993年01期

3 王景明;;渭河地塹斷裂構(gòu)造研究[J];地質(zhì)論評;1984年03期

4 解習(xí)農(nóng),任建業(yè),焦養(yǎng)泉,葛立剛;斷陷盆地構(gòu)造作用與層序樣式[J];地質(zhì)論評;1996年03期

5 馮有良,周海民,李思田,劉蘊華,董月霞,曹中宏;陸相斷陷盆地層序類型與構(gòu)造特征[J];地質(zhì)論評;2004年01期

6 韓恒悅,米豐收,劉海云;渭河盆地帶地貌結(jié)構(gòu)與新構(gòu)造運動[J];地震研究;2001年03期

7 薛祥煦,李文厚,劉林玉;渭河北遷與秦嶺抬升[J];西北大學(xué)學(xué)報(自然科學(xué)版);2002年05期

相關(guān)博士學(xué)位論文 前2條

1 趙慧;關(guān)中盆地地下熱水地球化學(xué)及其開發(fā)利用的環(huán)境效應(yīng)研究[D];長安大學(xué);2009年

2 何紅前;渭河盆地地裂縫成因機理研究[D];長安大學(xué);2011年

相關(guān)碩士學(xué)位論文 前2條

1 王焯;陜西渭南宋家北溝三門組的劃分對比及介形蟲研究[D];長安大學(xué);2006年

2 馮麗麗;基于GPS和跨斷層水準(zhǔn)測量的關(guān)中地區(qū)現(xiàn)今地殼水平與垂直運動研究[D];西北大學(xué);2007年

，

本文編號：2006355