本文選題：沉積體系　切入點(diǎn)：沉積相　出處：《西安科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：檸條塔井田位于鄂爾多斯盆地的東北部邊緣地帶,延安組是主要含煤地層,其上覆的直羅組地層中砂體沉積較厚,給地下水的發(fā)育提供了較好的存儲(chǔ)空間,是影響煤層開采的主要含水層。因此,分析直羅組砂體的展布對研究地下水的儲(chǔ)存與運(yùn)移具有重要意義,對于礦井防治水具有重要的指導(dǎo)作用。本文根據(jù)層序地層學(xué)與沉積學(xué)的理論和方法,在充分收集已有地質(zhì)資料的基礎(chǔ)上,對檸條塔井田直羅組地層的沉積體系、沉積相與層序地層格架進(jìn)行了全面系統(tǒng)的分析;探討了直羅組不同沉積相的空間展布特征;結(jié)合抽水試驗(yàn)取得的水文地質(zhì)資料,探討了直羅組砂巖含水層的富水規(guī)律,形成以下認(rèn)識(shí):1.根據(jù)沉積序列將區(qū)內(nèi)直羅組地層從下到上依次劃分為辮狀河沉積相-辮狀河三角洲沉積相-曲流河沉積相和濱淺湖沉積相;并分別進(jìn)行了亞相與微相分析。2.根據(jù)高分辨率層序地層學(xué)理論,通過基準(zhǔn)面旋回,把直羅組地層分割成1個(gè)II級(jí)層序,3個(gè)III級(jí)層序以及10個(gè)IV級(jí)層序,依次對應(yīng)的是1個(gè)超長期基準(zhǔn)面旋回(SLSC1),3個(gè)長期基準(zhǔn)面旋回(LSC1-LSC3)以及10個(gè)中期基準(zhǔn)面旋回(MSC1-MSC10)。3.依據(jù)直羅組沉積相的空間分布情況,分析認(rèn)為該區(qū)經(jīng)過了辮狀河-辮狀河三角洲-曲流河及濱淺湖沉積的過程。在直羅組形成階段,研究區(qū)地形表現(xiàn)為西高東低、北高南低的形態(tài),沉積碎屑物一般來自西北側(cè)及西側(cè)。4.直羅組沉積相以砂壩和粉砂-泥質(zhì)河漫、砂質(zhì)河道骨架為主,表現(xiàn)為南北向分布;其中,能夠?yàn)榈叵滤峁┹^好儲(chǔ)存空間的主要是砂質(zhì)河道及砂壩發(fā)育的厚度較大的砂巖層,此地段的砂巖富水性相對較強(qiáng)。5.綜合分析認(rèn)為直羅組沉積相與地層的富水性之間存在一定的內(nèi)在聯(lián)系;并根據(jù)砂體的展布規(guī)律將研究區(qū)劃分為富水性不同的三個(gè)區(qū)(強(qiáng)、中等和弱)。
[Abstract]:The Caragana tower mine field is located in the northeastern margin of Ordos basin. Yan'an formation is the main coal-bearing formation, and the sand body is thicker in the overlying formation of Zhiluo formation, which provides a good storage space for the development of groundwater. Therefore, it is of great significance to analyze the distribution of sand bodies in Zhiluo formation in order to study the storage and migration of groundwater. According to the theories and methods of sequence stratigraphy and sedimentology, the sedimentary system of the Zhiluo formation in Caragana Tower is studied on the basis of fully collecting the existing geological data. The sedimentary facies and sequence stratigraphic framework are analyzed systematically, the spatial distribution characteristics of different sedimentary facies in Zhiluo formation are discussed, and the water-rich law of sandstone aquifer of Zhiluo formation is discussed in combination with hydrogeological data obtained from pumping test. According to the sedimentary sequence, Zhiluo formation can be divided into braided river sedimentary facies, braided river delta sedimentary facies, meandering river sedimentary facies and shore-shallow lacustrine sedimentary facies. According to the theory of high-resolution sequence stratigraphy, the stratigraphy of Zhiluo formation is divided into 1 order II sequence, 3 III sequence and 10 order IV sequence through base-level cycle. SLSC1, LSC1-LSC3) and MSC1-MSC100.3.According to the spatial distribution of sedimentary facies in Zhiluo formation, SLSC1, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, and MSC1-MSC100.3. It is considered that the study area has undergone the deposition process of braided river, braided river delta, meandering river and shallow littoral lake. During the forming stage of Zhiluo formation, the topography of the study area was characterized by the west high east low, the north high south low, the north high and the south low. The sedimentary clastic materials generally come from the northwest and the western side. 4. The sedimentary facies of Zhiluo formation are sandbar and silty muddy river overflowing, the framework of sandy channel is dominant, and it is distributed in the north and south direction, among them, the sedimentary facies of the Zhiluo formation are characterized by sand dam and silty muddy river. The sandstones that can provide better storage space for groundwater are mainly sand channels and sand dams with relatively thick sandstone beds. The sandstone in this area is relatively rich in water. 5. The comprehensive analysis shows that there is a certain internal relation between the sedimentary facies of Zhiluo formation and the water enrichment of formation, and according to the distribution rule of sand body, the study area is divided into three regions with different water enrichment. Medium and weak.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P641.4

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