【摘要】：侏羅系儲(chǔ)集層是鄂爾多斯盆地中生界主力油層之一,該層位具有儲(chǔ)層物性好、飽和壓力低、油藏規(guī)模小、儲(chǔ)量豐度高、單井產(chǎn)量高的特點(diǎn),但同時(shí)存在相對(duì)低滲低壓以及油藏類型復(fù)雜等難題。本論文在前人研究基礎(chǔ)上,結(jié)合大量野外和室內(nèi)工作,對(duì)演武西地區(qū)侏羅系地層發(fā)育特征、古地貌的恢復(fù)、沉積相類型、儲(chǔ)層特征和控制因素等方面進(jìn)行深入研究。在地層劃分對(duì)比的基礎(chǔ)上,運(yùn)用前侏羅系古地質(zhì)圖法、井震結(jié)合法以及地層厚度印模法對(duì)侏羅系延10沉積前古地貌進(jìn)行刻畫(huà),其總體呈現(xiàn)出高地、殘梁(丘)、斜坡、河谷、河間丘并存的面貌。通過(guò)對(duì)相標(biāo)志的系統(tǒng)分析,確定了研究區(qū)的沉積相類型,演武西地區(qū)侏羅系主要發(fā)育辮狀河及湖泊三角洲平原沉積。受西南物源影響,研究區(qū)的砂體總體呈現(xiàn)南西一北東方向延伸,沉積相帶在平面上基本呈帶狀展布。通過(guò)對(duì)巖心樣品進(jìn)行分析,并對(duì)常規(guī)巖石薄片、鑄體薄片的掃描電子顯微鏡鏡下觀察,對(duì)儲(chǔ)層特征及儲(chǔ)層發(fā)育控制因素進(jìn)行研究,并對(duì)儲(chǔ)層進(jìn)行綜合性評(píng)價(jià)。延安組延6~延10層儲(chǔ)集巖巖石類型主要為中粒砂巖,巖屑含量以變質(zhì)巖巖屑為主,填隙物主要為雜基和膠結(jié)物,砂巖的儲(chǔ)集空間主要是孔隙,以剩余粒間孔為主。孔隙結(jié)構(gòu)主要發(fā)育中低排驅(qū)壓力-中粗喉型儲(chǔ)集層,分選好-較好,屬于中等-優(yōu)質(zhì)型儲(chǔ)層。在以上研究的基礎(chǔ)上,深入分析了儲(chǔ)層發(fā)育的主控因素,主要受沉積作用、物質(zhì)組分及成巖作用因素的影響,沉積微相的發(fā)育受不同水動(dòng)力和沉積方式的控制;儲(chǔ)集砂體以中粒砂巖為主,石英和巖屑含量較高,雜基相對(duì)較少;壓實(shí)作用很大程度上減小孔隙度進(jìn)而影響儲(chǔ)層物性;膠結(jié)作用是孔隙減少的原因之一;溶蝕作用是改善物性的主要原因;交代作用形成自生高嶺石的過(guò)程中也可改善物性;最后對(duì)研究區(qū)儲(chǔ)層進(jìn)行了綜合評(píng)價(jià),延6~延10段總體為II~III類儲(chǔ)層,部分為Ⅰ類儲(chǔ)層。
[Abstract]:Jurassic reservoir is one of the main reservoirs of Mesozoic in Ordos Basin. It has the characteristics of good reservoir physical property, low saturation pressure, small reservoir size, high reserves abundance and high single well production. But at the same time, there are some problems such as relatively low permeability and complex reservoir types. On the basis of previous studies, combined with a large number of field and laboratory work, this paper makes a thorough study on the characteristics of Jurassic strata development, paleogeomorphology recovery, sedimentary facies types, reservoir characteristics and controlling factors in Yanwu West area. On the basis of stratigraphic division and correlation, the paleogeomorphology of Jurassic Y10 was depicted by using the method of pre-Jurassic paleogeographic map, well and earthquake combination method and formation thickness impression method, which showed high ground, residual beam (mound), slope, valley, etc. The coexistence of the hills of the river. Based on the systematic analysis of the facies markers, the sedimentary facies types in the study area are determined. The Jurassic in the west Yanwu area is mainly composed of braided rivers and lake delta plain deposits. Under the influence of the southwest provenance, the sand bodies in the study area are generally extending from the south, west to the north, and the sedimentary facies belts are basically zonal distribution on the plane. Based on the analysis of core samples and the scanning electron microscope (SEM) observation of conventional and cast thin sections, the reservoir characteristics and controlling factors of reservoir development are studied, and the reservoir comprehensive evaluation is carried out. The reservoir rock types of Yan'an formation from 6 to 10 reservoirs are mainly medium-grained sandstone, with metamorphic lithic rocks as the main content, intergranular pore as the main reservoir space and residual intergranular pore as the main interstitial material. The pore structure is mainly developed in low and middle displacement pressure-coarse throat reservoirs, which are well sorted and good, and belong to medium-high quality reservoirs. On the basis of the above research, the main controlling factors of reservoir development are deeply analyzed, which are mainly influenced by sedimentation, material composition and diagenesis, and the development of sedimentary microfacies is controlled by different hydrodynamics and sedimentary methods. The reservoir sand body is dominated by medium grain sandstone, with high quartz and lithic content and relatively less complex base, compaction reduces porosity to a great extent and then affects reservoir physical properties, and cementation is one of the reasons for the decrease of porosity. Dissolution is the main reason for the improvement of physical properties, and the metasomatism can also improve physical properties during the process of forming authigenic kaolinite. Finally, the reservoir in the study area is evaluated synthetically. The reservoir of Y6 ~ Y10 is II~III type reservoir, part of which is type I reservoir.
【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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