鄂尔多斯盆地苏里格气田东三区南部山1、盒8段沉积相研究

发布时间：2018-05-14 11:18

本文选题：苏里格气田东三区南部 + 山1段　；参考：《长江大学》2017年硕士论文

【摘要】：苏里格气田是鄂尔多斯盆地上古生界内发现的大型岩性气藏之一,其中位于该气田东三区南部的山1段、盒8段为该区天然气主力储气层之一,但该研究区目前主力开发层段为下古生界马五段,对其上古生界山1段、盒8段沉积相特征的详细研究并未展开。为此,为了解决生产单位的生产要求,本论文在结合前人研究成果与生产资料的基础上,以鄂尔多斯盆地苏里格气田东三区南部地区山1段、盒8段为研究对象,运用沉积学、石油地质学和测井学等多学科理论,对研究区山1段、盒8段沉积微相进行了详细研究,对指导该区在上古生界主力层段的进一步勘探与开发具有重要的意义。主要成果和认识如下:1.对研究区内上古生界山1、盒8段进行了精细小层划分。在原有大层的基础上,依据地层等时性、沉积旋回特征、电测曲线特征及岩性变化等特性,细化分为7个小层,分别为山1-1、山1-2、山1-3,盒8上1、盒8上2、盒8下1、盒8下2。小层的精细划分有助于研究论文中目的层段单砂体及沉积微相的刻画,同时,也有助于生产单位更加目的化和精准的研究和开发有利层段。2.研究区山1段地层厚度在30-40m之间,中部地层隆起减薄,此次研究将山1段精细划分为山1-1、山1-2、山1-3。山1时期工区处在还原沉积环境背景下,岩心观察及野外露头中常见煤线。山1段岩石类型主要为岩屑石英砂岩,其次为岩屑砂岩,石英砂岩含量最低,颗粒结构成熟度高,呈圆状,岩石颜色多表现为灰白色-青灰色的还原色。3.研究区盒8段地层厚度在56-68m之间,厚度变化不大,地层平缓,砂地比明显高于山1段地层。此次研究将盒8段精细划分为盒8上1、盒8上2、盒8下1、盒8下2,其中盒8下2段砂体发育最好,砂体成层性好,也是研究和开发的主要层位。盒8段岩石类型主要为岩屑石英砂岩和石英砂岩,岩屑砂岩相对较少,偶见植物化石,分选中等,多为次棱角状,岩石颜色多表现为灰白色-深灰色。4.精细划分单井7个小层段的单井相,结合砂体比,勾画出7个层段的沉积相平面展布图。分析得出山1段时期是一种曲流河三角洲沉积,河道宽度为3-5km,河道交汇处多期河道砂体叠置,厚度可达20m以上。边滩砂体的宽度一般在1-2km之间,河道延伸一般在3-5km之间,最长可达7-8km,单砂体层厚一般在1.3-19.7m之间。盒8段时期是一种辫状河三角洲沉积,河道宽度为10-15km,河道交汇连片宽度可达30-40km,厚度20-30m。心滩砂体宽度没有明显的规律性,往往3-7km,沿河道延伸5-9km,最长延伸在11km以上;单砂层厚度可达10m及以上。5.结合鄂尔多斯盆地整体的构造及沉积演化特征,着重对苏里格东三区南部地区山1段、盒8段岩石类型、砂岩的岩石结构、沉积构造等进行详细的研究,确定了该区山1、盒8时期属于半干旱-半潮湿、沉积水体微咸的环境,主要发育冲积平原沉积,研究区内山1段主要为曲流河三角洲平原,盒8段主要为辫状河三角洲平原。6.山1段沉积时期,构造活动相对平静,以主下蚀作用、次侧蚀作用的曲流河主要发育;盒8段沉积时期,由于构造作用抬升,此时期以主垂向侵蚀作用、次侧向侵蚀作用的辫状河沉积主要发育,但在盒8上段沉积末期,研究区北部物源区粗粒物供给有所减少,出现泥岩段,洪泛沉积略占优势。
[Abstract]:The Sulige gas field is one of the large lithologic reservoirs found in the upper Paleozoic Erdos Basin, which is located in the 1 section of the mountain in the south of the Keda Tomi region, and the 8 section of the box is one of the main gas reservoirs in this area. However, the main development section of the study area is the five section of the lower Paleozoic, the 1 section of the upper Paleozoic mountain and the 8 section of the 8 section of the upper Paleozoic. In order to solve the production requirements of the production units, in order to solve the production requirements of the production units, on the basis of the previous research and production data, this paper takes the 1 section of the eastern three section of the eastern three area of the Sulige gas field in the Ordos Basin and the box 8 as the research object, and uses the multi-disciplinary theory of sedimentology, petroleum geology and logging to study area mountain 1. The 8 segment sedimentary microfacies of the section and box are studied in detail, which is of great significance to guide the further exploration and development of the main strata of the upper Paleozoic. The main achievements and understanding are as follows: 1. to the upper Palaeozoic mountain 1 and the 8 section of the upper Paleozoic in the study area, the fine layer is divided. On the basis of the original large layer, the sedimentary cycle is specially based on the stratigraphic isochronous. The characteristics of eigen, electrical measurement curve and lithology change are divided into 7 small layers, which are divided into 7 small layers: Mountain 1-1, mountain 1-2, mountain 1-3, box 8 1, box 8 2, box 8 below 1, and chamber and 8 2. layer fine division help to study the portrayal of single sand and sedimentary microfacies of the target layer in the paper, and also help the production unit to make more objective and accurate research and opening. The formation thickness of the 1 section of mountain area in the.2. study area is 30-40m, and the uplift of the middle stratum is thinner. The 1 section of the mountain is fine divided into the mountain 1-1, the mountain 1-2, and the 1 period of the mountain 1-3. mountain is under the background of the reduction sedimentary environment, the core observation and the common coal line in the outcrop. The rock type of the 1 section of the mountain is mainly lithic quartz sandstone, followed by rock. The content of sandstones and quartz sandstone is the lowest, with high maturity and round shape, and the color of the rock is characterized by the thickness of the 8 section of the gray white green gray.3. study zone between 56-68m, the thickness changes little, the stratum is gentle and the sand ratio is obviously higher than the 1 section of the mountain. The 8 sections of the box are carefully divided into box 8 1, box 8 2, and 8 boxes. The next 1, box 8 below 2, of which the box 8 lower 2 sections of sand body developed best, sand body formation is good, is also the main layer of research and development. The 8 section of the box is mainly lithic quartz sandstone and quartz sandstone, lithic sandstone is relatively small, even see fossil plant fossils, most of the secondary angle shape, the color of the rock most of the expression of gray white deep gray.4. fine delimit The single well phase of 7 small sections of a single well, combined with the sand body ratio, draws a graphic map of the sedimentary facies of 7 layers. It is concluded that the 1 section of the mountain is a kind of deltaic River Delta, the width of the river is 3-5km, the channel sand body is superimposed and the thickness can reach more than 20m. The width of the sand body of the bank is generally between 1-2km and the river is extended. Between 3-5km, the maximum length of up to 7-8km, the thickness of the single sand body is generally between 1.3-19.7m. The 8 section of the box is a braided river delta deposit, the width of the channel is 10-15km, the channel intersection width can reach 30-40km, the thickness of the thickness 20-30m. beach sand body has no obvious regularity, to 3-7km, along the river channel extending 5-9km, the longest extending above 11km. The thickness of the single sand layer can reach 10m and above.5. combined with the overall structure and sedimentary evolution characteristics of the Ordos Basin, focusing on the 1 section of the mountains in the southern area of the Sulige three area, the rock type of the box 8 section, the rock structure of the sandstone, the sedimentary structure and so on, and determined the mountain 1 in this area, and the period of the box 8 belongs to semi arid semi humid, and the sedimentary water is salty. The environment is mainly deposited in alluvial plain, the 1 section of the inner mountain in the study area is mainly the quanduhe delta plain, and the 8 section is mainly the 1 section of the.6. mountain in the braided river delta plain. The tectonic activity is relatively calm, the main erosion is the main erosion, the subside erosion of the quanduhe river is mainly developed; the period of the 8 section of the box is raised by the tectonic action and the period is in this time period, the period is due to the tectonic uplift The main development of the braided river deposits is the main vertical erosion and the secondary erosion, but at the end of the upper part of the box 8, the supply of coarse particles in the source area of the northern part of the study area is reduced, and the mudstone section appears, and the flood deposits have a little advantage.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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