本文選題：阿爾金　切入點(diǎn)：層序地層　出處：《新疆大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文在全面總結(jié)前人研究成果基礎(chǔ)上,以阿爾金以北的塔里木盆地東南緣為研究區(qū)域,利用野外露頭剖面、測(cè)井、地震、古生物等資料,以層序地層學(xué)理論為指向,針對(duì)塔東南6口鉆井4個(gè)煤礦及野外露頭剖面進(jìn)行了層序劃分和沉積體系的研究,將研究區(qū)劃分出2個(gè)二級(jí)層序及5個(gè)三級(jí)層序,并按低位域、湖侵域和高位域?qū)⒚總�(gè)層序三分,其中SQ1SQ2相當(dāng)于J1s,SQ3相當(dāng)于J1k,SQ4SQ5相當(dāng)于J2y和J2t。通過野外露頭剖面觀察、識(shí)別巖心建立典型沉積相序列,結(jié)合地震相及測(cè)井沉積相研究,識(shí)別主要沉積相類型。結(jié)果表明,侏羅系中下統(tǒng)主要發(fā)育沖積扇、扇三角洲、湖泊及沼澤4種沉積體系。認(rèn)為自早侏羅世至中侏羅世,由南部西昆侖山物源區(qū)至研究區(qū),沉積相帶以沖積扇—濱淺湖相逐漸過渡。早侏羅世時(shí)期,盆地處于斷陷初期,沉積范圍較小,沉積粒度相對(duì)較大,莎里塔什組以沖積扇、沖積平原及濱淺湖相沉積為主。中侏羅世時(shí)期,盆地向斷坳—坳陷過渡,沉積范圍增大,湖平面上升,沉積相帶依舊以沖積扇—湖泊過渡,出現(xiàn)扇三角洲平原及扇三角洲前緣亞相,沉積中心位于民豐凹陷及瓦石峽凹陷處。在此基礎(chǔ)上,通過對(duì)層序-沉積充填控制因素的分析,認(rèn)為沉積相帶的展布格局受構(gòu)造控制,研究區(qū)侏羅系沿山前呈NEE向狹長(zhǎng)帶狀展布,沉積中心位于民豐凹陷及瓦石峽凹陷一帶,物源區(qū)為南部東昆侖山。
[Abstract]:On the basis of summing up the previous research results, this paper takes the southeastern margin of Tarim Basin north of Altun as the research area, using outcrop profile, logging, earthquake, paleontology and other data, and taking sequence stratigraphy theory as the direction. The sequence division and depositional system of 4 coal mines and outcrop profiles in 6 wells in southeast of Tarim are studied. The study area is divided into two secondary sequences and five third-order sequences, and according to the low position region, the study area is divided into two secondary sequences and five third-order sequences. Each sequence is divided into three parts in the lake transgression region and the high level area, where SQ1SQ2 is equivalent to J1kGN SQ3, equivalent to J1knSQ4SQ5 equivalent to J2y and J2t.Through field outcrop profile observation, typical sedimentary facies sequences are identified and typical sedimentary facies sequences are established in the cores, which are studied in combination with seismic facies and logging sedimentary facies. The main sedimentary facies types are identified. The results show that four sedimentary systems, alluvial fan, fan delta, lake and swamp, are mainly developed in the middle and lower Jurassic. It is considered that from the early Jurassic to the middle Jurassic, from the source region of the western Kunlun Mountains in the south to the study area, In the early Jurassic period, the basin was in the early stage of fault depression, the sedimentary range was relatively small, the grain size was relatively large, and the alluvial fan was used in the Shalitash formation, and the sedimentary facies zone was gradually transitioning from alluvial fan to shallow lacustrine facies. During the Middle Jurassic period, the basin transitioned to fault-depression, the sedimentary area increased, the lake level rose, and the sedimentary facies zone was still alluvial fan-lake transition. The fan delta plain and fan delta front subfacies appear, and the sedimentary center is located in Minfeng sag and Washixia sag. Based on the analysis of the controlling factors of sequence and sedimentary filling, it is concluded that the distribution pattern of sedimentary facies belt is controlled by structure. The Jurassic in the study area is distributed along the front of the mountain in the NEE direction. The sedimentary center is located in the area of Minfeng Sag and Washixia Sag, and the source area is the East Kunlun Mountains in the south.
【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P534.52

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