本文選題：吐哈盆地　切入點(diǎn)：臺(tái)北凹陷　出處：《成都理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：本論文以吐哈盆地臺(tái)北凹陷勝北-紅連地區(qū)上侏羅統(tǒng)喀拉扎組一段作為研究對(duì)象,主要通過巖心、鉆錄井資料、測(cè)井資料及地震資料對(duì)研究區(qū)目的層位進(jìn)行了沉積學(xué)和巖相古地理研究。本文依據(jù)測(cè)井曲線形態(tài)和巖性特征將喀拉扎組一段細(xì)分為三個(gè)砂組。研究區(qū)喀拉扎組一段砂組的物源分析主要通過Dickinsom投點(diǎn)圖,碎屑組分特征、巖屑特征、重礦物和粘土礦物等多種方法的綜合應(yīng)用,確定了砂體主要以近南北向展布,發(fā)育博格達(dá)山和覺羅塔格山兩個(gè)物源區(qū),沒有混源沉積區(qū)。對(duì)吐哈盆地目的層取心段的典型沉積相標(biāo)志進(jìn)行了識(shí)別,并且完成了粒度分析,繼而系統(tǒng)的研究了臺(tái)北凹陷勝北-紅連地區(qū)鉆井的測(cè)井曲線特征和地震資料響應(yīng)。研究認(rèn)為,勝北-紅連地區(qū)主要發(fā)育辮狀河三角洲-湖泊沉積體系。建立在巖心相、測(cè)井相及地震和粒度分析資料的基礎(chǔ)上,在單井沉積相綜合柱狀圖中對(duì)各個(gè)砂組的沉積相進(jìn)行了劃分,主要發(fā)育辮狀河三角洲前緣亞相,微相包括水下分流河道、分流間灣、河口壩和遠(yuǎn)砂壩等。依據(jù)多口鉆井單井沉積相分析,進(jìn)而完成了研究區(qū)橫縱向的連井沉積相剖面對(duì)比,表明勝北-紅連地區(qū)物質(zhì)供給充分,砂體分布范圍廣,砂地比值高。在三個(gè)砂組中,二砂組砂體最發(fā)育,砂巖層厚度最大,粒度最粗。在巖心觀察中詳細(xì)識(shí)別了勝北和紅連地區(qū)巖心中出現(xiàn)的大量軟沉積物變形(震積巖),包括液化脈、液化角礫、液化卷曲變形、球-枕狀構(gòu)造、液化均一層、負(fù)載構(gòu)造、紋層卷曲變形、階梯狀微斷層、“V”型震裂縫和震裂角礫等變形構(gòu)造。震積巖集中發(fā)育在一、二砂組,震積巖典型構(gòu)造的累積厚度與連井沉積相剖面中的砂巖層厚度成正比,認(rèn)為喀拉扎組一段砂組是地震作用的特殊沉積響應(yīng),研究區(qū)北部構(gòu)造活動(dòng)強(qiáng)于南部,表明博格達(dá)山在燕山運(yùn)動(dòng)Ⅱ幕的再次隆升。通過仔細(xì)辨別北部勝北地區(qū)和南部紅連地區(qū)沉積微相和累積砂體厚度的差異性,本文認(rèn)為,震積巖指示的造山運(yùn)動(dòng)控制了勝北-紅連地區(qū)“南早北晚,北陡南緩”辮狀河三角洲沉積體系。作者認(rèn)為勝北地區(qū)發(fā)育陡坡辮狀河三角洲,紅連地區(qū)發(fā)育緩坡辮狀河三角洲�；趯�(duì)研究區(qū)物源體系和喀拉扎組一段各個(gè)砂組沉積期的沉積體系研究,最終在吐哈盆地臺(tái)北凹陷勝北-紅連地區(qū)建立了相應(yīng)的沉積模式圖。在地層厚度、砂體厚度和砂地比值的數(shù)據(jù)統(tǒng)計(jì)基礎(chǔ)之上,限定沉積亞相邊界,對(duì)三個(gè)砂組進(jìn)行了精細(xì)巖相古地理特征分析,結(jié)果表明研究區(qū)辮狀河三角洲前緣的沉積格局沒有發(fā)生大的轉(zhuǎn)變,沉積演化經(jīng)歷了“湖盆萎縮到擴(kuò)張”的過程。
[Abstract]:In this paper, the first member of the Upper Jurassic Karazar formation in Shengbei Honglian area, Taibei Sag, Turpan-Hami Basin, is taken as the research object. The sedimentology and lithofacies paleogeography of the target horizon in the study area were studied by logging data and seismic data. According to the logging curve morphology and lithologic characteristics, the first section of the Karazar formation was subdivided into three sand formations. The provenance analysis of the sand formation in the formation is mainly based on the Dickinsom plot. The comprehensive application of various methods, such as clastic composition, lithic characteristics, heavy minerals and clay minerals, has determined that the sand bodies are mainly distributed in the north-south direction, and the two provenances of Bogda Mountain and Jurothagh Mountains are developed. There is no mixed source sedimentary area. The typical sedimentary facies markers of the core member of the target layer in the Turpan-Hami Basin have been identified, and the grain size analysis has been completed. The logging curve characteristics and seismic data response of drilling in Shengbei-Honglian area of Taipei depression are systematically studied. It is considered that the braided river delta-lake sedimentary system is mainly developed in Shengbei Honglian area, which is based on the core facies. On the basis of logging facies and seismic and particle size analysis data, the sedimentary facies of each sand group are divided in single well sedimentary facies comprehensive histogram, mainly developed braided river delta front subfacies, microfacies including underwater distributary channel, distributary bay, etc. Estuarine dam and far sand dam, etc. Based on the sedimentary facies analysis of multiple drilling single wells, the horizontal and longitudinal correlation of the sedimentary facies of the connected well in the study area has been completed. The results show that there is sufficient material supply and a wide distribution of sand bodies in Shengbei-Honglian area. Among the three sand formations, the sand body of the second sand group is the most developed, and the sandstone layer thickness is the largest. In the core observation, a large number of soft sediment deformations in the cores of Shengbei and Honglian areas were identified in detail (seismogenic rocks, including liquefaction veins, liquefaction boulders, liquefaction curls, spherical pillows, liquefaction, and liquefaction. Deformation structures such as load structure, crimp deformation of grain layer, ladder microfault, "V" type earthquake fracture and seismic crack breccia. The seismogenic rocks are concentrated in the first and second sand formations, The cumulative thickness of typical structures of seismite is directly proportional to the thickness of sandstone in the sedimentary facies profile of continuous wells. It is considered that the sand formation of the first member of Karazar formation is a special sedimentary response of earthquake, and the tectonic activity in the northern part of the study area is stronger than that in the south. By carefully distinguishing the difference of sedimentary microfacies and accumulative sand body thickness between the northern Shengbei area and the southern Honglian area, it is suggested that, The orogenic movement indicated by seismogenic rocks controlled the sedimentary system of braided river deltas in Shengbei Honglian area, which is early in the south, gentle in the north and gentle in the north. The authors think that the braided river delta on the steep slope is developed in the area of Shengbei. The braided river delta is developed in Honglian area. Based on the study of the provenance system in the study area and the sedimentary systems of each sand formation in the first member of the Karazar formation, Finally, a corresponding sedimentary model map was established in Shengbei-Honglian area of Taibei Sag, Turpan-Hami Basin. Based on the statistical data of formation thickness, sand body thickness and sand land ratio, the sedimentary subfacies boundary was defined. The fine lithofacies paleogeographic characteristics of three sand formations are analyzed. The results show that the sedimentary pattern of braided river delta front in the study area has not changed greatly, and the sedimentary evolution has experienced the process of "lake basin shrinking to expanding".
【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】：2016
【分類號(hào)】：P534.52;P531

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本文編號(hào)：1630155