本文選題：楊莊勘探區(qū)　切入點(diǎn)：晉祠組-太原組　出處：《中國(guó)礦業(yè)大學(xué)》2016年碩士論文

【摘要】：楊莊勘探區(qū)位于山西古交市南端的草莊頭村周?chē)?估算資源量12.29億噸,下二疊統(tǒng)晉祠組-太原組為主要的含煤地層之一。而隨著對(duì)楊莊井田勘探程度的不斷加深,迫切需要對(duì)楊莊井田開(kāi)展全面的煤炭賦存規(guī)律研究工作。本文以經(jīng)典層序地層學(xué)、巖石學(xué)、沉積學(xué)、煤地質(zhì)學(xué)等學(xué)科的理論和方法為指導(dǎo),再結(jié)合楊莊勘探區(qū)野外40余口鉆孔資料、測(cè)井資料的分析,以及Y2-10井和Y3-6井的野外精心編錄,對(duì)楊莊勘探區(qū)晉祠組-太原組沉積相,層序的劃分、古地理的展布以及煤層的聚集規(guī)律等進(jìn)行了研究。研究表明,楊莊勘探區(qū)晉祠組-太原組時(shí)期為一陸表海淺水三角洲-碳酸鹽巖臺(tái)地-障壁島-瀉湖-潮坪體系,并進(jìn)一步劃分為7個(gè)亞相和9個(gè)微相。其次,通過(guò)層序界面的識(shí)別,將晉祠組-太原組分為4個(gè)三級(jí)層序,8個(gè)體系域,并建立了研究區(qū)層序地層格架。SQ1時(shí)期主要發(fā)育一套海侵體系域和高位體系域,海侵體系域以碳酸鹽巖臺(tái)地和瀉湖為主,東部普遍發(fā)育厚度不大的吳家峪灰?guī)r,海水自東北面而來(lái);高位體系域發(fā)育潮坪沉積,未見(jiàn)煤層;SQ2時(shí)期也發(fā)育海侵體系域和高位體系域,沉積相以三角洲平原-瀉湖-潮坪為主,泥炭沼澤廣泛發(fā)育,形成全區(qū)厚度大、分布廣泛的8#煤和9#煤,在SQ1末期華北地臺(tái)發(fā)生蹺蹺板運(yùn)動(dòng),地層由南高北低變?yōu)楸备吣系?海水來(lái)自東南方;SQ3時(shí)期,海水幾次侵入后退,形成廟溝和毛兒溝灰?guī)r,灰?guī)r中含大量的蜓化石。高位體系域以潮坪相為主,發(fā)育全區(qū)局部可采的7#煤層;SQ4時(shí)期海水最后一次從南面入侵,形成全區(qū)廣泛分布的斜道灰?guī)r,L4灰?guī)r為質(zhì)地純凈的生物碎屑灰?guī)r沉積,是整個(gè)華北地區(qū)晚古生代最大海侵的產(chǎn)物,高位體系域發(fā)育一套分流河道微相和分流間洼地微相為主的沉積,并在三角洲平原上發(fā)育泥炭沼澤,形成局部發(fā)育的6#煤層。海水自此全面撤出山西全境。8#煤層發(fā)育于SQ2海侵體系域內(nèi),煤層分布面積廣,厚度大、層位穩(wěn)定,結(jié)構(gòu)簡(jiǎn)單至復(fù)雜,厚度變化的總體規(guī)律為西北厚,東南薄,三角洲相比潮坪相更適合沉積厚煤層。煤厚等值線圖與硫分等值線圖出現(xiàn)驚人的相似性,說(shuō)明海平面變化對(duì)聚煤演化起著重要的控制作用。9#煤層發(fā)育于海侵體系域中,除局部地區(qū)未見(jiàn)煤外,全區(qū)穩(wěn)定分布,煤層呈向東開(kāi)口的半弧形展布,總體厚度變化的趨勢(shì)是向東向北厚度逐漸增厚。地形古地理和海平面共同控制9#煤煤厚的變化,而在未見(jiàn)煤地段發(fā)育分流河道砂巖,應(yīng)是在后生沖刷作用下導(dǎo)致煤層在此處尖滅。
[Abstract]:Yangzhuang exploration area is located around Caozhuangtou Village in the southern tip of Gujiao City Shanxi Province. The estimated amount of resources is 1.229 billion tons and the Lower Permian Jinci formation-Taiyuan formation is one of the main coal-bearing strata.With the deepening of the exploration degree of Yangzhuang mine field, it is urgent to carry out a comprehensive study of coal occurrence law in Yangzhuang mine field.Guided by the theories and methods of classical sequence stratigraphy, petrology, sedimentology and coal geology, this paper combines the field data of more than 40 boreholes in Yangzhuang exploration area, the analysis of logging data, and the detailed cataloguing of Y2-10 well and Y3-6 well in the field.The sedimentary facies, sequence division, paleogeography distribution and coalbed accumulation of Jinci formation and Taiyuan formation in Yangzhuang exploration area were studied.The results show that the Jinci formation to Taiyuan formation in Yangzhuang exploration area is a shallow water deltaic carbonate platform barrier island lagoon tidal flat system and is further divided into 7 subfacies and 9 microfacies.Secondly, through the identification of sequence interface, the Jinci formation-Taiyuan formation is divided into 4 third order sequences and 8 system tracts, and a set of transgressive system tracts and high system tracts are mainly developed in the period of sequence stratigraphy framework. SQ1 in the study area.Transgressive system tracts are dominated by carbonate platforms and lagoons, and Wujiayu limestone is generally developed in the east of China.Transgressive system tracts and highstand system tracts were also developed in the period of SQ2. The sedimentary facies were mainly delta plain, lagoon and tidal flat, peat swamp was widely developed, and formed large thickness and widely distributed 8# coal and 9# coal in the whole area.Seesaw movement occurred in the North China platform at the end of SQ1, the strata changed from high in the south to low in the north to low in the north and south. The sea water came from the period of SQ3 in the southeast of China. The sea water intruded and retreated several times, forming Miaogou and Maogou limestone, which contained a large number of fly fossils.The highstand system tract is dominated by tidal flat facies and developed the last intrusion of seawater from the south in SQ4, a locally recoverable coal seam in the whole area, resulting in a wide distribution of sloping limestone and L4 limestone deposits of pure bioclastic limestone in the whole area.It is the product of the largest transgression of the late Paleozoic in the whole North China. A set of distributary channel microfacies and interdistributary depression microfacies are developed in the upper system tract, and peat swamps are developed on the delta plain, forming locally developed 6 # coal seam.Since then, the sea water has completely withdrawn from the whole area of Shanxi Province. The coal seam has been developed in the SQ2 transgression system region. The coal seam has a wide distribution area, a large thickness, a stable horizon, a simple and complex structure, and the overall law of thickness variation is thick in the northwest and thin in the southeast.The delta is more suitable for thick seams than tidal flat facies.The remarkable similarity between the contour map of coal thickness and that of sulfur shows that the sea level change plays an important controlling role in the evolution of coal accumulation. The coal seam is developed in the transgressive system tract, with the exception of no coal in the local area, the stable distribution of the whole area.The coal seam has a semi-arc distribution with an orifice to the east, and the thickness of the coal seams tends to increase gradually from the east to the north.Topography, paleogeography and sea level control the variation of coal thickness; however, distributary channel sandstone is developed in the unseen coal area, which should be caused by epigenetic scouring to cause coal seams to be destroyed here.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P618.11;P531

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本文編號(hào)：1715321