本文選題：沉積特征 + 層序地層��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：團(tuán)魚(yú)山地區(qū)位于柴達(dá)木盆地北緣,賽什騰山南麓,隸屬青海省大柴旦行委轄區(qū)內(nèi)。包括團(tuán)魚(yú)山北部及昆源露天煤礦、團(tuán)魚(yú)山(中部)、結(jié)綠素,是柴北緣重點(diǎn)煤產(chǎn)地之一。利用現(xiàn)有資料開(kāi)展該區(qū)聚煤規(guī)律研究對(duì)指導(dǎo)外圍煤炭資源勘查、提高勘查地質(zhì)效果,具有重要的理論意義和實(shí)際意義。本文以團(tuán)魚(yú)山地區(qū)現(xiàn)有的煤炭勘探地質(zhì)成果資料為基礎(chǔ),總結(jié)分析了研究區(qū)侏羅系沉積體系和層序地層格架,重點(diǎn)分析了基于層序地層格架的巖相古地理及其演化特征,最后分析了研究區(qū)侏羅系聚煤規(guī)律及進(jìn)一步找煤方向。團(tuán)魚(yú)山地區(qū)總體為向南西傾的單斜,后期受喜馬拉雅造山運(yùn)動(dòng)的影響,形成疊瓦狀逆沖推覆構(gòu)造體系。區(qū)域斷裂呈北西西-南東東向延展,與地層總體走向一致。含煤地層為中侏羅統(tǒng)大煤溝組及石門(mén)溝組,石門(mén)溝組含煤5層,大煤溝組含煤2層,共含煤7層。研究區(qū)為陸相沉積體系,主要沉積相有辮狀河、辮狀河三角洲和湖泊沉積相。通過(guò)對(duì)研究區(qū)層序地層研究,可將區(qū)內(nèi)侏羅系劃分為4個(gè)三級(jí)層序(SⅢ1 — SⅢ4)。通過(guò)分析認(rèn)為,其煤層主要發(fā)育在中侏羅世大煤溝組層序SⅢ1沉積期的辮狀河沖積平原上,其次為中侏羅世石門(mén)溝組層序SⅢ2和層序SⅢ3沉積期辮狀河三角洲和濱淺湖相帶。其聚煤作用主要受控于古氣候、基底沉降、沉積環(huán)境和基準(zhǔn)面變化。從成煤環(huán)境角度分析,預(yù)測(cè)團(tuán)魚(yú)山南部為有利找煤區(qū),層序SⅢ1-層序SⅢ2為主要找煤層位。
[Abstract]:Tuanyushan area is located in the northern margin of the Qaidam Basin, the southern foot of the Saiteng Mountain, belonging to the Daqidan Commission area of Qinghai Province. Including Tuanyushan North and Kuanyuan opencast coal mine, Tuanyushan (central), green pigment, is one of the key coal production areas in the northern margin of Qaidam. It is of great theoretical and practical significance to use existing data to study the law of coal accumulation in this area to guide the exploration of peripheral coal resources and to improve the geological effect of exploration. Based on the existing geological data of coal exploration in Tuanyushan area, this paper summarizes and analyzes the Jurassic sedimentary system and sequence stratigraphic framework in the study area, and emphatically analyzes the lithofacies and palaeogeography based on the sequence stratigraphic framework and its evolution characteristics. Finally, the law of Jurassic coal accumulation and the direction of further coal searching are analyzed. The Tuanyushan area is a monocline inclined to the south and west, and the imbricate thrust nappe system was formed in the late stage by the Himalayan orogenic movement. The regional faults extend in the NW-SE direction, consistent with the overall strike of the strata. The coal-bearing strata are middle Jurassic Dachaigou formation and Shimenggou formation, the Shimengou formation contains 5 coal layers, the Dachaigou formation contains 2 coal layers, and there are 7 coal layers. The main sedimentary facies are braided river, braided river delta and lacustrine sedimentary facies. By studying the sequence stratigraphy of the studied area, the Jurassic system in this area can be divided into four third-order sequences (S 鈪，

本文編號(hào)：2116951