本文選題：和什托洛蓋盆地 + 西山窯組�。� 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：準(zhǔn)噶爾盆地的西北緣和什托洛蓋盆地中侏羅統(tǒng)西山窯組發(fā)育多套煤層。本文綜合利用野外露頭、鉆井巖心、測井和地震等資料,研究和什托洛蓋盆地中侏羅統(tǒng)西山窯組地層格架及沉積體系的空間展布及演化,在此基礎(chǔ)上分析煤的聚集規(guī)律,取得如下主要成果:(1)詳細(xì)研究了和什托洛蓋盆地下、中侏羅統(tǒng)層序界面特征,將下、中侏羅統(tǒng)地層劃分為一個二級層序,七個三級層序。其中西山窯組劃分兩個層序(SQ6和SQ7),分別發(fā)育低位體系域、湖擴體系域和高位體系域三個完整的體系域。(2)研究區(qū)主要發(fā)育辮狀河、三角洲和湖泊三種沉積體系類型。SQ6和SQ7形成時期,湖域面積逐漸減少,三角洲廣泛發(fā)育�？傮w上研究區(qū)南北緣沉積相較為接近,主要為辮狀河三角洲,但北部由于地勢較陡,局部發(fā)育沖積扇。(3)研究區(qū)物源主要分別來自盆地南北兩個方向,但南部地區(qū)物源供給速率和強度在不同時期有所差別。SQ6形成時期,北部的賽米斯臺山和阿爾加提山為盆地主要的物源供給區(qū)。物源的充足供應(yīng),加之可容納空間的增加,為成煤提供了良好的條件。SQ7形成時期,在北部的賽米斯臺山和阿爾加提山物源供給持續(xù)不減的情況下,南緣的哈拉阿拉特山輸送大量物質(zhì)進入盆地,加之構(gòu)造沉降迅速,盆地南緣沉積地層厚度劇增,發(fā)育大量煤層。(4)將基準(zhǔn)面旋回理論運用于聚煤規(guī)律的研究,認(rèn)為可容納空間增長速率與物源供給速率相近的濱淺湖-三角洲相環(huán)境有利于成煤,低位體系域內(nèi)煤層不發(fā)育,高位體系域形成中、晚期是煤炭發(fā)育的最佳時期。
[Abstract]:The northwest margin of Junggar Basin and the Middle Jurassic Xishanyao formation in the Shitorogei Basin developed multiple sets of coal seams. In this paper, the spatial distribution and evolution of the stratigraphic framework and sedimentary system of the Xishanyao formation of the Middle Jurassic in the Middle Jurassic are studied by using the field outcrop, drilling core, logging and seismic data. On this basis, the regularity of coal accumulation is analyzed. The main achievements are as follows: 1) the sequence interface characteristics of the Middle Jurassic are studied in detail in the Lower and Lower Jurassic basins. The Lower Middle Jurassic stratigraphy is divided into a secondary sequence and seven third-order sequences. The Xishanyao formation is divided into two sequences, SQ6 and SQ7, respectively. Three complete system tracts, I. e., low system tract, lacustrine extension system tract and high system tract, are developed in Xishanyao formation, and braided rivers are mainly developed in the study area. During the formation of deltaic and lacustrine sedimentary systems. SQ6 and SQ7, the lake area gradually decreased and the delta developed widely. On the whole, the sedimentary facies in the northern and southern margin of the study area are relatively close, mainly braided river delta, but in the northern part of the study area, because of steep topography, the alluvial fan. 3) the provenance of the study area mainly comes from the north and south directions of the basin. However, the rate and intensity of provenance supply in the southern region are different in different periods. SQ6 was formed in the northern part of the basin, and the Simis-Taishan and Algatti Mountains in the north were the main provenance areas in the basin. The sufficient supply of the source, coupled with the increase in the accommodative space, provided good conditions for coal formation. SQ7 was formed, while the supply of the provenance in the northern Simis and Alcati mountains continued unabated. A large amount of material is transported into the basin by the Arrate Mountain in the southern margin of the basin, in addition to the rapid tectonic subsidence, the thickness of sedimentary strata in the southern margin of the basin increases dramatically, and a large number of coal seams are developed. (4) the base-level cycle theory is applied to the study of the law of coal accumulation. It is considered that the shallow lacustrine delta facies environment, which can accommodate the space growth rate and the material supply rate, is favorable to coal-forming, and the coal seam is not developed in the low level system region, and the formation of the high system tract is the best time for the coal development in the late stage.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.11;P534.52

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本文編號：1872419