本文選題：大安油田 + 微裂縫�。� 參考：《東北石油大學(xué)》2015年碩士論文

【摘要】：大安油田區(qū)域構(gòu)造位置位于松遼盆地中央坳陷區(qū)大安-紅崗階地二級構(gòu)造帶中。目的層為下白堊統(tǒng)泉頭組扶余油層,是典型的低滲透砂巖油田。儲(chǔ)層物性差,非均質(zhì)性強(qiáng),裂縫發(fā)育復(fù)雜,對油氣的分布和滲流起決定性作用。因此,研究該油田裂縫發(fā)育規(guī)律對油田開發(fā)方案設(shè)計(jì)及開發(fā)效果分析具有重要的指導(dǎo)意義。論文獲得的主要認(rèn)識:(1)研究區(qū)儲(chǔ)層物性總體特征表現(xiàn)為:儲(chǔ)層物性較差,主要為特低孔-超低孔、超低滲-致密儲(chǔ)層。研究表明孔喉半徑對滲透率具有明顯的控制作用,孔隙大小與滲透率相關(guān)性較好,分選性、連通性與孔滲關(guān)系復(fù)雜。大安油田扶余油層主要發(fā)育成巖裂縫和局部構(gòu)造裂縫,裂縫規(guī)模上主要為微觀裂縫。從地質(zhì)分類角度看,研究區(qū)內(nèi)發(fā)育的裂縫主要為層間/層理縫、粒內(nèi)縫、粒緣縫和局部構(gòu)造縫;規(guī)模分類上主要發(fā)育的是微觀裂縫。(2)裂縫主要受三方面因素控制:斷裂對物性的影響可能更多的體現(xiàn)在裂縫分布方面,而對孔隙的影響不大;沉積環(huán)境是決定儲(chǔ)層物性的前提條件,不同沉積微相的巖性、物性不同,造成不同沉積微相力學(xué)性質(zhì)不同,從而導(dǎo)致裂縫發(fā)育程度存在明顯差異;成巖作用對于儲(chǔ)層裂縫后期改善具有很大影響,扶余油層局部抬升剝蝕,酸性氧化的地表水加劇了成巖溶蝕作用。(3)研究區(qū)發(fā)育典型致密儲(chǔ)層,含有典型致密油,準(zhǔn)連續(xù)分布,甜點(diǎn)富集,含油豐度低且分布復(fù)雜。根據(jù)巖心資料與錄井資料對巖心的含油級別進(jìn)行劃分,分為五個(gè)級別,分別為含油、油浸、油斑、油跡與熒光。儲(chǔ)層滲流能力隨可動(dòng)流體飽和度的增加而增加,通過研究建立了可動(dòng)流體飽和度與孔隙度、滲透率的回歸關(guān)系,定量地評價(jià)儲(chǔ)層可動(dòng)流體飽和度及滲流能力大小,其中裂縫可以有效改善儲(chǔ)層滲流能力。(4)無論是構(gòu)造縫還是非構(gòu)造縫,它們對致密砂巖儲(chǔ)層的儲(chǔ)集性能都有著很大的改善作用,都可以作為油氣的儲(chǔ)集空間和運(yùn)移通道。裂縫可以明顯提高儲(chǔ)層滲透率,溝通原有儲(chǔ)層孔隙,儲(chǔ)層質(zhì)量得到良好的改善。當(dāng)烴類在運(yùn)移過程中受到泥巖遮擋時(shí),隨著壓力增大泥巖段聚集而產(chǎn)生裂縫,烴類通過泥巖裂縫排出,泥巖內(nèi)部壓力釋放后微裂縫閉合,微裂縫可以有效運(yùn)移油氣。
[Abstract]:The regional tectonic location of Da'an Oilfield is located in the secondary tectonic belt of the Da'an-Honggang terrace in the central depression of Songliao Basin. The target formation is a typical low permeability sandstone oil field, which is a Fuyu reservoir of Quantou formation of Lower Cretaceous. The reservoir has poor physical property, strong heterogeneity and complex fracture development, which plays a decisive role in the distribution and seepage of oil and gas. Therefore, the study of fracture development in this oilfield is of great significance to the design of oilfield development scheme and the analysis of development effect. The main conclusions obtained in this paper are as follows: (1) the general characteristics of reservoir physical properties in the study area are as follows: the reservoir physical properties are poor, mainly ultralow porosity and ultra-low permeability tight reservoir. The results show that the radius of pore throat has obvious control effect on permeability, the correlation between pore size and permeability is good, and the relationship between porosity and permeability is complex. Diagenetic fracture and local structural fracture are mainly developed in Fuyu reservoir of Da'an Oilfield, and the fracture scale is mainly micro fracture. From the perspective of geological classification, the fractures developed in the study area are mainly interlayer / bedding fractures, intragranular fractures, grain margin fractures and local structural fractures. (2) fractures are mainly controlled by three factors: the effect of fracture on physical properties may be more reflected in the distribution of fractures, but the effect on pores is not; Sedimentary environment is the precondition to determine reservoir physical properties. The lithology and physical properties of different sedimentary microfacies make the mechanical properties of different sedimentary microfacies different, resulting in obvious difference of fracture development degree. Diagenesis has a great influence on the improvement of reservoir fracture in the later stage. The partial uplift and denudation of Fuyu oil layer and acidic oxidized surface water aggravate diagenetic dissolution. (3) typical dense reservoir is developed in the study area, which contains typical dense oil and is quasi-continuous distribution. Rich dessert, low oil abundance and complex distribution. According to the core data and logging data, the oil-bearing grade of the core is divided into five grades, namely, oil bearing, oil immersion, oil spot, oil trace and fluorescence. The percolation capacity of reservoir increases with the increase of movable fluid saturation. The regression relationship between movable fluid saturation and porosity and permeability is established, and the reservoir movable fluid saturation and percolation capacity are quantitatively evaluated. Fractures can effectively improve the percolation ability of reservoir. (4) both structural fractures and non-structural fractures can improve the reservoir performance of tight sandstone reservoir greatly and can be used as reservoir space and migration channel of oil and gas. Fracture can obviously improve reservoir permeability, communicate with original reservoir porosity, and improve reservoir quality well. When hydrocarbon is blocked by mudstone in the process of migration, cracks are produced with increasing pressure of mudstone section, hydrocarbon is expelled through mudstone fracture, micro-fracture is closed after release of internal pressure of mudstone, and micro-fracture can effectively migrate oil and gas.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

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本文編號：2086398