本文關(guān)鍵詞： 中侏羅統(tǒng) 千佛崖組 地層對比 沉積相 沉積模式　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】：川東北元壩地區(qū)是四川盆地內(nèi)有利的油氣儲備區(qū)塊,勘探結(jié)果顯示該地區(qū)中侏羅統(tǒng)千佛崖組具有較好的油氣勘探潛力,但由于前期對千佛崖組沉積特征、沉積模式和沉積演化規(guī)律等研究不夠深入,制約了該地區(qū)千佛崖組的油氣勘探工作。基于此,本文以沉積學(xué)理論為指導(dǎo),以旺蒼金溪鎮(zhèn)剖面、廣元榮山鎮(zhèn)剖面、南江橋亭剖面和渠縣三匯剖面為骨干剖面,結(jié)合鉆井巖心觀察,在大量巖石薄片觀察和各類測試分析的基礎(chǔ)上,對川東北元壩地區(qū)中侏羅統(tǒng)千佛崖組地層特征和沉積特征進行了深入研究,建立了千佛崖組的沉積模式,明確了元壩地區(qū)千佛崖組沉積相展布特征和沉積演化規(guī)律,為進一步勘明中侏羅統(tǒng)千佛崖組的油氣儲藏情況奠定了基礎(chǔ)在對3條實測剖面、7條觀測剖面和20余口重點井取芯段觀察分析的基礎(chǔ)上,總結(jié)出元壩地區(qū)千佛崖組具有“上雜、下雜、中間深”的特點,據(jù)此將千佛崖組劃分為三個亞段。其中,千佛崖組一段以雜色泥巖與灰色細粉砂巖互層為主,間夾薄層紫紅色泥巖,測井曲線多見鋸齒形;千佛崖組二段;千佛崖組測井曲線呈箱形。千佛崖組三段的厚度是千佛崖組中最大的,巖性主要為雜色泥巖,灰綠色細-粉砂巖和泥質(zhì)粉砂巖與灰黑色頁巖互層發(fā)育,無集中成層的黑色頁巖,測井曲線呈齒形和漏斗形。在對元壩地區(qū)千佛崖組巖性、電性、古生物和各類地球化學(xué)等相標志研究和識別的基礎(chǔ)上,認為千佛崖組沉積環(huán)境為三角洲和湖泊沉積相,發(fā)育三角洲平原、三角洲前緣、前三角洲和濱淺湖沉積四類亞相,水下分流河道、水下分流間灣、水下天然堤、河口壩、遠砂壩、席狀砂、淺湖泥和淺湖砂壩等微相。元壩地區(qū)千佛崖組沉積環(huán)境總體為三角洲-湖泊沉積模式。研究區(qū)在千佛崖組時期主要受燕山運動影響,盆地性質(zhì)為米倉山—大巴山類前陸盆地。物源補給主要來源于龍門山和米倉山-大巴山地區(qū)。從物源區(qū)攜帶的泥砂碎屑物質(zhì)快速堆積形成三角洲沉積帶,隨著構(gòu)造沉降,逐漸過渡為湖泊相。從千一段到千三段主要發(fā)育三角洲相和湖泊相沉積環(huán)境。其中三角洲相主要以三角洲前緣亞相為主,湖泊相以淺湖亞相為主。中侏羅世千佛崖期元壩地區(qū)發(fā)育三角洲-湖泊沉積,平面上以三角洲前緣亞相和淺湖亞相為優(yōu)勢相。千一段沉積期,主河道發(fā)育在中部和西部,此時三角洲向湖推進至研究區(qū)南部邊緣;千二段沉積期,中部和西部物源持續(xù)供給,主河道穩(wěn)定發(fā)育,東部地區(qū)三角洲沉積已開始收縮;千三段沉積期,西部和中部河道穩(wěn)定并向湖推進,東部地區(qū)三角洲向東北方向萎縮。
[Abstract]:The Yuanba area in northeast Sichuan is a favorable oil and gas reserve block in Sichuan basin. The exploration results show that Qianfoya formation of the Middle Jurassic in this area has good oil and gas exploration potential, but due to the sedimentary characteristics of Qianfoya formation in the early stage, The research on sedimentary model and sedimentary evolution is not deep enough, which restricts the oil and gas exploration work of Qianfoya formation in this area. Based on this, this paper, guided by sedimentology theory, takes WangCang Jinxi section and Guangyuan Rongshan section as guidance. Nanjiangqiao Ting section and Quxian Sanhui section are the backbone sections, combined with drilling core observation, on the basis of a large number of thin pieces of rock observation and various kinds of test and analysis. The stratigraphic and sedimentary characteristics of the Qianfoya formation of the Middle Jurassic in the Yuanba area of northeast Sichuan are studied, the sedimentary model of the Qianfoya formation is established, and the distribution characteristics of sedimentary facies and the regularity of sedimentary evolution of the Qianfeiya formation in the Yuanba area are clarified. For the further exploration of the oil and gas reservoir of Qianfoya formation of the Middle Jurassic in the Ming Dynasty, on the basis of observation and analysis of 3 observed sections and 7 observation sections and more than 20 key wells, it is concluded that the Qianfeiya formation in Yuanba area has "upper complex". The Qianfoya formation is divided into three subsections according to the characteristics of the lower complex and the middle depth. The first section of the Qianfoya formation is mainly composed of mixed mudstone and gray fine siltstone interbedded with thin layer purple mudstone between which the logging curves are mostly sawtooth. The logging curve of Qianfoya formation is box-shaped. The thickness of the third member of Qianfoya formation is the largest in Qianfoya formation, and its lithology is mainly mixed mudstone, gray-green fine siltstone and mudstone interbedded with gray and black shale. The logging curves are toothed and funnel-shaped. Based on the study and identification of lithology, electrical properties, paleontology and geochemistry of Qianfoya formation in Yuanba area, It is considered that the sedimentary environment of Qianfoya formation is delta and lacustrine facies, delta plain, delta front, prodelta and littoral shallow lake sedimentary subfacies, underwater distributary channel, underwater distributary bay, underwater natural embankment, estuary dam, etc. The sedimentary environment of Qianfeiya formation in Yuanba area is a deltaic lake sedimentary model. The study area was mainly influenced by Yanshanian movement during the Qianfoya formation period. The nature of the basin is the Mickangshan-Daba Foreland basin. The material supply mainly comes from the Longmen Mountain and the Mecang Mountain Dabashan area. The mud sand clastic material from the source area rapidly accumulates to form a delta sedimentary belt, and along with the tectonic subsidence, the silt detrital material from the source area forms a delta sedimentary zone. The delta facies and lacustrine facies sedimentary environment are mainly developed from Qianyi to Thousand three members. The delta facies mainly consists of delta front subfacies. The lacustrine facies is dominated by shallow lacustrine subfacies. The delta lacustrine deposits were developed in Yuanba area of Qianfoya period in the Middle Jurassic, and the delta front subfacies and shallow lake subfacies were the dominant facies on the plane. At this time, the delta advances to the southern edge of the study area, the sedimentary period of the Qian2 formation, the supply of provenance in the central and western regions, the steady development of the main river channel, the beginning of contraction of the delta sediments in the eastern region, the sedimentary period of the thousand three member, The western and central rivers are stable and advancing toward the lake, while the eastern delta shrinks to the northeast.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P618.13

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