【摘要】：薩中開發(fā)區(qū)位于薩爾圖背斜構(gòu)造中部,呈西陡、東緩、中部比較平坦的形態(tài),是大慶長垣北部的一個局部構(gòu)造。油藏精細(xì)描述發(fā)現(xiàn),全區(qū)共有斷層82條,絕大多數(shù)斷層在構(gòu)造的軸部和西翼發(fā)育,且均為正斷層,多為北西、北北西方向延伸。其中,北一、二排西部位于薩爾圖背斜構(gòu)造西翼北部,落實到高一油層組頂構(gòu)造圖上,共發(fā)育11條斷層。研究表明,所研究區(qū)塊油層最初形成時由于地殼上升,水域不斷縮小,海(湖)岸線向海洋(湖心)一側(cè)退縮,因此一層砂石,一層泥相互交織沉積形成了三角洲-陸地河流形態(tài),該層段組成是白堊系。在油層孔滲特征上,總體表現(xiàn)為隨滲透率增大,平均孔隙半徑和半徑中值增大的特點(diǎn)。沉積相上表現(xiàn)為三角洲前緣相沉積,主要以外前緣相沉積為主,其砂體粒度細(xì)、泥質(zhì)和鈣含量高、油層物性較差。非均質(zhì)性上,整體表現(xiàn)為韻律段間差異、層間滲透率差異較小,平面上砂體發(fā)育較穩(wěn)定,連續(xù)性較好,油層相對較均質(zhì)。采用容積法對儲量進(jìn)行了精確計算,結(jié)果表明,北一、二排西部高臺子油層地質(zhì)儲量為1372.1×104t,其中表內(nèi)油層地質(zhì)儲量為825.1×104t,表外油層地質(zhì)儲量為448.5×104t,油水同層地質(zhì)儲量為98.5×104t。隨著油田開發(fā)的深入,北一、二排西部高臺子油層開發(fā)矛盾越來越突出,集中體現(xiàn)在:一是現(xiàn)階段在高臺子油層所布的井網(wǎng)分屬不同時期,不同組合,統(tǒng)一調(diào)整工作比較復(fù)雜;二是對于注水量需求較大,目前的注水井滿足不了生產(chǎn)需要,這也造成許多油井產(chǎn)液量嚴(yán)重不足;三是采油井中高臺子和薩葡油層不分層開采會形成嚴(yán)重的層間干擾,使得高臺子油層受到影響而降低產(chǎn)液量。因此需要通過加密調(diào)整來改善開發(fā)效果。按照“整體研究、統(tǒng)一部署、細(xì)分層系、縮小井距”的原則設(shè)計高臺子油層加密井網(wǎng),以期達(dá)到減緩油層產(chǎn)量遞減速度,改善油層開發(fā)效果,提高油層采收率的目的。最終確定五點(diǎn)法面積井網(wǎng)開發(fā)高臺子油層,注采井?dāng)?shù)比確定為1:1.33更加合理。
[Abstract]:Sazhong Development Zone, located in the middle of Saltu anticline, is a local structure in the north of Daqing Placanticline. The detailed description of the reservoir shows that there are 82 faults in the whole area, most of which are developed in the axis and the western wing of the structure, and they are normal faults, most of which are north west, north west and north west extending. The north and west of the first and second rows are located in the north of the western wing of the Saltu anticline, and 11 faults have been developed on the top structural map of the Gaoyi formation. The study shows that when the oil layer of the block in question initially formed, because the crust was rising and the waters were shrinking, the shoreline of the sea (lake) retreated to the side of the ocean (the center of the lake), so it was a layer of sand and stone. A layer of mud interweaves to form a delta-land river form, which is composed of Cretaceous. The characteristics of porosity and permeability in reservoir are as follows: with the increase of permeability, the mean pore radius and median radius increase. The sedimentary facies are delta front facies, mainly outer front facies, with fine grain size of sand body, high content of mud and calcium, and poor physical properties of reservoir. In terms of heterogeneity, the overall performance is the difference between rhythmic segments, the difference of interlayer permeability is small, the development of sand body on the plane is more stable, the continuity is better, and the reservoir is relatively homogeneous. The volume method is used to accurately calculate the reserves. The results show that the geological reserves of the Gaotaizi reservoir in the first and second rows of North China are 1372.1 脳 10 ~ 4t, in which the geologic reserves of the oil layers in the surface are 825.1 脳 10 ~ 4t, the geological reserves of the oil reservoirs off the surface are 448.5 脳 10 ~ 4t, and the geological reserves of the same oil and water layers are 98.5 脳 10 ~ 4t. With the development of oil field, the contradiction of the development of Gaotaizi reservoir in the first and second rows of North China has become more and more prominent, which is embodied in the following aspects: firstly, the well pattern distributed in Gaotaizi reservoir belongs to different periods at the present stage, different combinations, and the unified adjustment work is more complicated; Second, there is a large demand for water injection, and the current water injection wells cannot meet the production needs, which also results in a serious shortage of liquid production in many wells; third, the unstratified production of Gao Taizi and Sapu reservoirs in the production wells will result in serious interlayer interference. The formation of Gaotaizi oil is affected and the liquid production is reduced. Therefore, encryption adjustment is needed to improve the development effect. According to the principle of "overall research, unified deployment, subdivision of strata, and reduction of well spacing", the infill well pattern of high Taizi reservoir is designed in order to slow down the rate of production decline, improve the effect of reservoir development and increase oil recovery. Finally, it is more reasonable to determine the number of injection-production wells to be 1: 1.33 for the development of Gaotaizi reservoir with five-point area pattern.
【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】：TE34

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