發(fā)布時(shí)間：2018-03-16 07:34

  本文選題：鮞粒灘　切入點(diǎn)：臺(tái)地邊緣沉積結(jié)構(gòu)　出處：《成都理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：四川盆地東北部包括了九龍山背斜構(gòu)造帶、池溪凹陷、通南巴背斜構(gòu)造帶和蒼溪—巴中低緩構(gòu)造帶,具有較長的碳酸鹽巖油氣勘探歷史。根據(jù)已有的工業(yè)鉆井資料及前人研究資料顯示,區(qū)內(nèi)下三疊統(tǒng)飛仙關(guān)組有很好的勘探潛力。目前基于高精度等時(shí)地層格架的臺(tái)緣幾何形態(tài)演化、內(nèi)部沉積體系構(gòu)成及空間變化的研究有待開展。為此,本論文針對川東北元壩地區(qū)飛仙關(guān)組臺(tái)緣沉積展開研究,結(jié)合前人資料和鉆井資料補(bǔ)充,對飛仙關(guān)組臺(tái)緣沉積進(jìn)行小波變換、Fischer圖解等詳細(xì)研究,建立高精度等時(shí)地層格架,總結(jié)分析飛仙關(guān)組臺(tái)地邊緣結(jié)構(gòu)及沉積體系空間分布和鮞粒類型的空間演化,得到以下結(jié)論和認(rèn)識(shí):(1)川東北元壩地區(qū)飛仙關(guān)組可劃分為SQ1和SQ2兩個(gè)三級(jí)層序,且兩個(gè)層序由高水位體系域和海侵體系域組成,均缺失低位體系域。飛一段和飛二段為SQ1,飛三段和飛四段為SQ2。在地震和鉆井資料約束下,嘗試性開展了基于小波變換和Fischer圖解聯(lián)合約束下的高精度層序地層的劃分和對比工作,SQ1時(shí)期,在對開江—梁平海槽進(jìn)行填平補(bǔ)齊,陸棚相區(qū)的沉積厚度較其它兩個(gè)相區(qū)大,高頻層序發(fā)育較不均衡。SQ2時(shí)期,元壩地區(qū)碳酸鹽巖臺(tái)地基本形成,高頻層序發(fā)育較為均衡�？傮w認(rèn)為兩種方法的疊合能有效地進(jìn)行高精度層序地層的綜合分析,但是Fischer在不同的相帶位置結(jié)構(gòu)差異明顯,針對不同相帶應(yīng)選擇性應(yīng)用。(2)基于地震、野外露頭和鉆井資料綜合分析,系統(tǒng)開展了元壩地區(qū)飛仙關(guān)組沉積相類型構(gòu)成分析,飛仙關(guān)組可識(shí)別出局限臺(tái)地、開闊臺(tái)地、臺(tái)地邊緣、臺(tái)地邊緣斜坡和陸棚等沉積相,進(jìn)一步劃分了沉積亞相類型,并揭示了各自的基本特征。(3)系統(tǒng)揭示了臺(tái)地邊緣鮞粒類型構(gòu)成及垂向分布特點(diǎn),鮞粒具多成因特點(diǎn),室內(nèi)鏡下鑒定出真鮞、表鮞、放射鮞、復(fù)鮞和同心鮞等原生沉積鮞粒,以及白云石化鮞、壓實(shí)變形鮞、負(fù)鮞、重結(jié)晶鮞和破裂鮞等后期改造鮞粒。同時(shí),揭示鮞粒具有多層段分布特點(diǎn),飛一段、飛二段、飛三段均有,以飛二段為主,并揭示鮞粒類型在垂向上具有一定的分異性的特點(diǎn)。(4)基于地震、鉆井等資料,系統(tǒng)開展了飛仙關(guān)組海平面變換及臺(tái)地沉積結(jié)構(gòu)特征及演化研究,研究揭示,飛仙關(guān)組臺(tái)緣沉積結(jié)構(gòu)總體的向東明顯前積的結(jié)構(gòu)特點(diǎn),并具有早期SQ1TST海侵退積、SQ1HST早期具有緩慢海侵,鮞灘開始生長,SQ2晚期,快速海退鮞灘大面積發(fā)育,并快速向東前積的沉積結(jié)構(gòu)特點(diǎn)。到飛二段晚期,由于開江梁平陸棚的填平補(bǔ)齊,研究區(qū)主要演化為局限臺(tái)地—臺(tái)地蒸發(fā)巖。進(jìn)而形成了飛一段退積、飛二段快速進(jìn)積和飛三—飛四段加積的沉積結(jié)構(gòu)樣式,而鮞粒灘沉積主體時(shí)期的飛二段,其早中晚期鮞粒的平面分布特征具有一定的差異性。在該沉積結(jié)構(gòu)基礎(chǔ)上,形成對應(yīng)性的鮞粒灘時(shí)空分布規(guī)律,并建立了飛仙關(guān)組早期前積遷移的沉積模式。
[Abstract]:The northeast Sichuan basin includes Jiulongshan anticline structural belt, Qixi sag, Tongnanba anticline structural belt and Cangxi-Bazhong low-moderate structural belt. It has a long history of oil and gas exploration in carbonate rocks. According to the existing industrial drilling data and previous research data, The Feixianguan formation of the Lower Triassic in this area has good exploration potential. At present, the research on the geometry evolution of the platform margin based on the high-precision isochronous stratigraphic framework, the composition of the internal sedimentary system and the spatial variation of the sedimentary system need to be carried out. In this paper, based on the research of platform margin deposition of Feixianguan formation in Yuanba area of northeast Sichuan, combining with previous data and well drilling data, we have carried out wavelet transform Fischer diagram and other detailed studies on the platform margin deposition of Feixianguan formation, and set up a high-precision isochronous stratigraphic framework. Based on the summary and analysis of the spatial distribution of platform marginal structure and sedimentary system and oolitic type of the Feixianguan formation, the following conclusions and understandings are obtained: the Feixianguan formation in Yuanba area, northeast Sichuan, can be divided into two third-order sequences: SQ1 and SQ2. The two sequences are composed of high water level system tracts and transgressive system tracts, both of which are missing low system tracts. The Fei-1 and Fei2 are SQ1, Fei3 and Fei4 are SQ2.Under seismic and drilling data constraints, The division and correlation of high-precision sequence stratigraphy based on the combination of wavelet transform and Fischer diagram were carried out tentatively in SQ1 period. During the period of SQ1, the sedimentary thickness of shelf facies was larger than that of the other two facies areas, in the filling and leveling of the Kaijiang-Liangping trough, and the sedimentary thickness of the shelf facies was larger than that of the other two facies regions. During the period of unbalanced development of high-frequency sequence. SQ2, carbonate platform in Yuanba area was basically formed, and high-frequency sequence was relatively balanced. It is generally considered that the combination of the two methods can effectively carry out comprehensive analysis of high-precision sequence stratigraphy. However, there are obvious differences in the location and structure of Fischer in different facies belts. In view of the selective application of different facies belts, based on the comprehensive analysis of seismic, outcrop and drilling data, the composition analysis of sedimentary facies types of Feixianguan formation in Yuanba area has been carried out systematically. The Feixianguan formation can identify the sedimentary facies, such as limited platform, open platform, platform margin, platform margin slope and shelf, and further divide the sedimentary subfacies. The basic characteristics of each system are also revealed. The system reveals the composition and vertical distribution of oolitic grains on the edge of the platform, the characteristics of the oolitic grains with multiple genesis, and the primary sedimentary oolitic grains, such as true oolitic, superficial oolitic, radiative oolitic, complex oolitic and concentric oolitic, etc. At the same time, it is revealed that the oolitic particles have the characteristics of multilayer distribution, such as Feiyi, Fei-second, Fei-3, and mainly Fei-second, and so on, in the later stage of oolitic transformation, such as dolomitization, compacted deformed oolitic, negative oolitic, recrystallized oolitic and ruptured oolitic. It is also revealed that oolitic types have some distinct characteristics in vertical direction. (4) based on seismic and drilling data, a systematic study on the sea level transformation and platform sedimentary structure and evolution of the Feixianguan formation has been carried out. The sedimentary structure of the platform margin of the Feixianguan formation has the characteristics of eastward obvious forward accumulation, and the early SQ1TST transgressive regressive sedimentation SQ1HST has slow transgression in the early stage, the oolitic beach began to grow in the late stage of SQ2, and the rapid regressive oolitic beach developed in a large area. And the characteristics of sedimentary structure of rapid eastward forward deposition. By the late stage of Feijiangliangping continental shelf, the main evolution of the study area was limited platform platform evaporite, and then formed the Feiyi retrogradation. There are some differences in the plane distribution characteristics of oolitic oolitic beach oolitic oolitic beach in the rapid precession of the second stage and the accumulation of the fourth member of the third and fourth member of the Feiyi formation, and the difference of the plane distribution of the oolitic particles in the early, middle and late stages of the oolitic beach sedimentary stage, based on the sedimentary structure. The corresponding spatial and temporal distribution of oolitic beach was formed, and the sedimentary model of early forward migration of Feixianguan formation was established.
【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】：2017
【分類號(hào)】：P618.13

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