鄂爾多斯盆地安塞南部延安組下段沉積微相研究
發(fā)布時(shí)間：2019-02-12 23:59
【摘要】：鄂爾多斯盆地作為我國(guó)第二大沉積盆地,含有豐富的油氣資源。本文綜合安塞南部地區(qū)地質(zhì)概況、巖心資料、測(cè)井資料等基礎(chǔ)資料,對(duì)延安組下段延10、延9、延8三個(gè)油層組進(jìn)行地層劃分與對(duì)比,在此基礎(chǔ)上進(jìn)行了沉積微相分析與類型識(shí)別、沉積微相平面展布與砂體平面展布等研究,并在沉積微相研究的基礎(chǔ)上,結(jié)合物性資料及試油資料等,預(yù)測(cè)了有利勘探區(qū)。通過(guò)標(biāo)志層法、沉積旋回法、地層等厚法,對(duì)延10、延9、延8三個(gè)油層組進(jìn)行了地層劃分與對(duì)比,詳細(xì)描述了各油層組的厚度、巖電特性,并通過(guò)多井剖面對(duì)比,分析了目的層在縱、橫向上的發(fā)育變化特征。利用鉆井巖心觀察、測(cè)井資料,通過(guò)巖石學(xué)特征、巖性組合、沉積構(gòu)造、古生物化石、測(cè)井相等相標(biāo)志特征,作者認(rèn)為延10油層組屬于辮狀河亞相沉積,發(fā)育河道砂壩微相,只在研究區(qū)南部局部地區(qū)發(fā)育泛濫平原微相;延9、延8油層組屬于三角洲前緣亞相沉積,發(fā)育水下分流河道、水下分流間灣、前緣席狀砂和河口壩微相。延10油層組受甘陜古河的影響,發(fā)育東西向展布的砂體,延9、延8油層組砂體相對(duì)較薄,均發(fā)育3條北東南西展布的水下分流河道砂體。研究區(qū)延10、延9、延8三個(gè)油層組的均發(fā)育鼻狀構(gòu)造,且位置和規(guī)模具有一定的繼承性,主要分布在G17井-X6010井以及G22井-Q52井一帶。研究區(qū)延安組下段主要為構(gòu)造-巖性油氣藏,沉積微相、鼻狀構(gòu)造為油氣聚集的主控因素。分析認(rèn)為研究區(qū)存在兩種油氣成藏模式,即斜坡區(qū)-河流相成藏模式和三角洲前緣成藏模式。結(jié)合各油層組砂體展布特征、孔滲特征、油層分布特征以及頂構(gòu)造特征,對(duì)研究區(qū)延10、延9、延8三個(gè)油層組進(jìn)行了有利區(qū)塊預(yù)測(cè),共選出了8個(gè)最有利的勘探區(qū),為以后的勘探開(kāi)發(fā)提供了依據(jù)。
[Abstract]:As the second largest sedimentary basin in China, Ordos Basin is rich in oil and gas resources. Based on the geological survey, core data, logging data and other basic data in the southern Ansai area, this paper makes stratigraphic division and correlation of Yan 10, Yan 9 and Yan 8 reservoirs in the lower member of Yan'an formation. On this basis, sedimentary microfacies analysis and type identification, sedimentary microfacies plane distribution and sand body plane distribution are studied. On the basis of sedimentary microfacies research, combined with physical property data and oil test data, favorable exploration areas are predicted. By means of marker layer method, sedimentary cycle method and formation equal thickness method, the stratigraphic division and correlation of Yan 10, Yan 9 and Yan 8 reservoirs are carried out, and the thickness and electrical characteristics of each reservoir group are described in detail, and the correlation of multi-well profile is carried out. The development and variation characteristics of the target layer in longitudinal and horizontal are analyzed. By using drilling core observation, logging data, petrological characteristics, lithologic assemblages, sedimentary structures, paleontological fossils, logging equivalent facies markers, the authors consider that the Yan10 oil formation belongs to braided river subfacies and develops channel bar microfacies. The flood plain microfacies were developed only in the southern part of the study area. Yan 9 and Yan 8 oil formations belong to delta front subfacies and develop subaqueous distributary channel, underwater distributary bay, front matte sand and estuarine bar microfacies. Affected by Ganshanguhe, the Yan 10 oil formation developed east-west distribution sand bodies, while the Yan 9 and Yan 8 formations were relatively thin, all developed three underwater distributary channel sandbodies distributed in the north, southeast and west. In the study area Yan 10, Yan 9 and Yan 8 have developed rhinoid structures, and their location and scale are inherited to a certain extent, mainly distributed in G17 well X6010 well and G22 well Q52 well area. The lower member of Yan'an formation is mainly tectonic-lithologic reservoir with sedimentary microfacies and nose structure as the main controlling factor of oil and gas accumulation. It is concluded that there are two types of oil and gas accumulation models in the study area, that is, slope area-fluvial formation model and delta front model. Combined with the distribution characteristics of sand bodies, pore and permeability characteristics, reservoir distribution characteristics and top structure characteristics, the favorable blocks of Yan 10, Yan 9 and Yan 8 reservoirs in the study area were predicted, and the 8 most favorable exploration areas were selected. It provides the basis for the exploration and development in the future.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13
[Abstract]:As the second largest sedimentary basin in China, Ordos Basin is rich in oil and gas resources. Based on the geological survey, core data, logging data and other basic data in the southern Ansai area, this paper makes stratigraphic division and correlation of Yan 10, Yan 9 and Yan 8 reservoirs in the lower member of Yan'an formation. On this basis, sedimentary microfacies analysis and type identification, sedimentary microfacies plane distribution and sand body plane distribution are studied. On the basis of sedimentary microfacies research, combined with physical property data and oil test data, favorable exploration areas are predicted. By means of marker layer method, sedimentary cycle method and formation equal thickness method, the stratigraphic division and correlation of Yan 10, Yan 9 and Yan 8 reservoirs are carried out, and the thickness and electrical characteristics of each reservoir group are described in detail, and the correlation of multi-well profile is carried out. The development and variation characteristics of the target layer in longitudinal and horizontal are analyzed. By using drilling core observation, logging data, petrological characteristics, lithologic assemblages, sedimentary structures, paleontological fossils, logging equivalent facies markers, the authors consider that the Yan10 oil formation belongs to braided river subfacies and develops channel bar microfacies. The flood plain microfacies were developed only in the southern part of the study area. Yan 9 and Yan 8 oil formations belong to delta front subfacies and develop subaqueous distributary channel, underwater distributary bay, front matte sand and estuarine bar microfacies. Affected by Ganshanguhe, the Yan 10 oil formation developed east-west distribution sand bodies, while the Yan 9 and Yan 8 formations were relatively thin, all developed three underwater distributary channel sandbodies distributed in the north, southeast and west. In the study area Yan 10, Yan 9 and Yan 8 have developed rhinoid structures, and their location and scale are inherited to a certain extent, mainly distributed in G17 well X6010 well and G22 well Q52 well area. The lower member of Yan'an formation is mainly tectonic-lithologic reservoir with sedimentary microfacies and nose structure as the main controlling factor of oil and gas accumulation. It is concluded that there are two types of oil and gas accumulation models in the study area, that is, slope area-fluvial formation model and delta front model. Combined with the distribution characteristics of sand bodies, pore and permeability characteristics, reservoir distribution characteristics and top structure characteristics, the favorable blocks of Yan 10, Yan 9 and Yan 8 reservoirs in the study area were predicted, and the 8 most favorable exploration areas were selected. It provides the basis for the exploration and development in the future.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13
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