本文選題：微觀地質(zhì)特征　切入點：滲流區(qū)間　出處：《西北大學(xué)》2015年碩士論文

【摘要】：馬嶺油田北三區(qū)延10儲層目前已處于典型的中—高含水開發(fā)后期階段,開發(fā)過程中注水沿高滲帶突進(jìn),水驅(qū)動用程度低,導(dǎo)致其地質(zhì)儲量采出程度低。本文從微觀地質(zhì)特征與油水運動規(guī)律的關(guān)系,微觀剩余油分布控制因素等方面對該問題深入剖析。綜合高壓壓汞、油水相滲、恒速壓汞、核磁共振等實驗探究儲層微觀孔隙結(jié)構(gòu)和滲流特征,進(jìn)行儲層物性下限和滲流區(qū)間的限定和劃分,對微觀剩余油的形成和分布進(jìn)行實驗?zāi)M,探討目前注水開發(fā)條件下微觀剩余油形成機理和分布控制因素。主要研究成果有：(1)儲層孔隙分布較為集中(120μm～140μm),屬于較大孔隙—大孔隙；喉道半徑平均值6.33μm,分布差異極大,微細(xì)喉道、細(xì)—中喉道、粗喉道三者均分,造成儲層滲透率非均質(zhì)性高、滲流差異明顯。粗孔喉對滲流影響大,決定了滲透率貢獻(xiàn)主值。(2)孔隙組合類型可劃分為粒間孔型(27%)、溶孔—粒間孔型(52%)和微孔型(21%)三種,總體可動流體飽和度分均值偏高(83.94%),但在油水相滲中出現(xiàn)差異性,溶孔—粒間孔型樣品含水率增加緩慢,采收率下降慢。注水在水驅(qū)油實驗中均勻推進(jìn)；粒間孔型樣品油相和水相能力的互換迅速,滲流空間不大,水驅(qū)油實驗中注水指—網(wǎng)狀推進(jìn),易形成優(yōu)勢通道。微孔型樣品在含水率上升的情況下油相滲透率遞減迅速,產(chǎn)油能力衰減很快,水驅(qū)實驗驅(qū)替條件高。(3)沉積成巖作用對微觀孔隙結(jié)構(gòu)的改造,巖石潤濕性和流體性質(zhì)在油水滲流過程中的干擾,再加上溫度、壓力、注水方式等各種開發(fā)因素的影響,共同控制著研究區(qū)儲層驅(qū)油效率、微觀剩余油類型和分布的復(fù)雜變化。(4)儲層不可動孔喉半徑下限0.280μm；無效滲流區(qū)間0.280μm～0.741μm,受彎曲,狹小的喉道控制；正常滲流區(qū)間0.741μm～4.571μm,由孔隙和喉道共同控制,滲透率貢獻(xiàn)率較低；主流滲流區(qū)間4.571μm,總進(jìn)汞量高,滲流能力強,其中7.968μm是研究區(qū)儲層易發(fā)生水竄的優(yōu)勢滲流通道孔喉半徑平均值。(5)儲層綜合分類與生產(chǎn)相結(jié)合：Ⅰ類(粒間孔型)儲層孔喉半徑非均質(zhì)性強,初期產(chǎn)油量高,但目前大部分已被水淹；Ⅱ類(溶孔—粒間孔型)儲層低含水穩(wěn)產(chǎn)周期長,平面分布面積大、微觀分布均勻,是進(jìn)一步的有利開發(fā)目標(biāo)；Ⅲ類(微孔型)儲層微細(xì)喉道發(fā)育,孔隙結(jié)構(gòu)相對較差,驅(qū)替條件相對較高,為劣勢儲層。
[Abstract]:At present, Yan10 reservoir in North third area of Maling Oilfield is in the late stage of typical medium-high water cut development. During the development process, water flooding along the high permeability zone and low water driving degree are necessary. In this paper, the relationship between microcosmic geological characteristics and oil-water movement law, microcosmic remaining oil distribution control factors and other aspects are analyzed in depth. Comprehensive high pressure mercury injection, oil-water phase infiltration, constant velocity mercury injection, etc. The microscopic pore structure and percolation characteristics of the reservoir are investigated by nuclear magnetic resonance (NMR) experiments, the lower limit of reservoir physical properties and the interval of percolation are defined and divided, and the formation and distribution of microscopic residual oil are simulated experimentally. The formation mechanism and distribution control factors of micro residual oil under the condition of water injection development at present are discussed. The main research results are as follows: the pore distribution of the reservoir is more concentrated at 120 渭 m or 140 渭 m, which belongs to the larger porosity and macropore, the average throat radius is 6.33 渭 m, and the distribution is very different. The permeability heterogeneity of reservoir is high, the difference of percolation is obvious, and the influence of coarse pore throat on percolation is great. It is determined that the pore assemblage types can be divided into three types: intergranular pore type (27), solution-intergranular pore type (522)) and micropore type (21). The total movable fluid saturation is higher than 83.94%, but there are differences in oil-water phase permeability. The water cut increases slowly and the oil recovery decreases slowly. The water injection is promoted uniformly in the water drive experiment. The intergranular pore sample has a rapid exchange of oil phase and water phase, and the percolation space is not large. In the experiment of water flooding, the water injection finger-net propelling is easy to form the dominant channel. When the water cut increases, the oil phase permeability decreases rapidly, and the oil production ability decays rapidly. The experimental displacement condition of water flooding is high. Xi 3) the transformation of sedimentary diagenesis to micro pore structure, the interference of rock wettability and fluid properties in the process of oil and water seepage, and the influence of various development factors such as temperature, pressure, water injection mode, etc. The reservoir displacement efficiency, the complex variation of microcosmic remaining oil type and distribution, the lower limit of the inmovable pore throat radius 0.280 渭 m, the invalid percolation interval 0.280 渭 m, are controlled by the curved and narrow throat channel, the reservoir displacement efficiency in the study area is controlled jointly. The normal percolation interval is 0.741 渭 m and 4.571 渭 m, controlled by pore and throat, the permeability contribution rate is low, the mainstream percolation interval is 4.571 渭 m, the total mercury content is high, the percolation ability is strong, Among them, 7.968 渭 m is the average value of pore throat radius of percolation channel, which is prone to water channeling in the study area. The combination of reservoir comprehensive classification and production is as follows: class I (intergranular pore type) reservoir has strong heterogeneity of pore throat radius and high initial oil production. But at present, most of them have been flooded, the low water cut and stable production period of type 鈪，

本文編號：1676725