本文選題：儲層評價　切入點：三角洲平原　出處：《西北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：儲層評價是油藏描述的重要內(nèi)容,研究工作貫穿于整個油田勘探開發(fā)過程,對保障油田高效科學(xué)開發(fā)具有重要的指導(dǎo)意義。其研究內(nèi)容涵蓋宏觀層面的沉積微相、砂體非均質(zhì)性以及微觀層面的孔隙結(jié)構(gòu)、物性差異、滲流特征等。靖邊油田鄭石灣區(qū)位于鄂爾多斯盆地陜北斜坡中南部,目前該區(qū)長2油層組區(qū)域注水存在有水竄現(xiàn)象導(dǎo)致部分油井含水偏高,影響注水開發(fā)效果。通過對研究區(qū)長2儲層的綜合評價,搞清儲層砂體展布規(guī)律和宏觀、微觀非均質(zhì)性等,圈定儲層有利區(qū)分布,進(jìn)而為井網(wǎng)布置、開發(fā)注水方案的實施等提供儲層地質(zhì)方面的依據(jù)。本文運用沉積學(xué)、石油地質(zhì)學(xué)和儲層地質(zhì)學(xué)的相關(guān)理論知識,采用鉆井測井資料分析、巖心觀察描述以及多種儲層實驗測試手段相結(jié)合的方法,對鄭石灣區(qū)延長組長2油層組進(jìn)行了精細(xì)地層劃分與對比,儲層沉積微相類型識別及平面分布刻畫,并分析了儲層成巖作用和物性特征,結(jié)合儲層宏觀與微觀特征,進(jìn)行了儲層綜合分類評價。根據(jù)旋回對比和標(biāo)志層識別等原則,將鄭石灣區(qū)長2油層組劃分為3個砂層組,其中主要儲油層長21可進(jìn)一步劃分為3個小層。巖心觀察和測井相分析認(rèn)為,研究區(qū)長2油層組主要發(fā)育三角洲平原亞相,包括分流河道、分流間灣等沉積微相;物源供給方向來自研究區(qū)東北部。單砂體刻畫結(jié)果顯示順河道方向砂體連通性好,垂直河道方向連通性較差;長2儲層巖石以灰白色、灰綠色中-細(xì)粒長石砂巖為主;經(jīng)歷了多種成巖作用,其中對儲層物性有利的建設(shè)性成巖作用包括溶蝕、交代作用;破壞性成巖作用為機械及化學(xué)壓實作用、膠結(jié)作用;成巖階段為中成巖階段A期;大量巖心樣品物性實驗測試表明,研究區(qū)長2油層組主要為中孔隙度、低滲透率儲層;潤濕性及敏感性分析顯示長2為親水型,無～較弱速敏、較弱鹽敏、中等～偏強水敏、弱～較強堿敏、弱酸敏;對主要儲油層段長21砂層組各小層非均質(zhì)性研究表明,長211小層及長213小層的層間非均質(zhì)性較強,平面非均質(zhì)性較弱;長212小層層間非均質(zhì)性較弱,但平面非均質(zhì)性相對較強;選取沉積微相特征、儲層物性特征以及非均質(zhì)性相關(guān)表征參數(shù),采用聚類分析方法,對長21砂層組各小層進(jìn)行了綜合評價,劃分出好、中等、差三類儲層。通過與研究區(qū)已有生產(chǎn)井初期產(chǎn)量的對比,檢驗了儲層評價與預(yù)測結(jié)果。研究區(qū)長21砂層組有利區(qū)的分布主要受沉積微相展布控制,后期成巖作用對物性和非均質(zhì)性影響明顯。
[Abstract]:Reservoir evaluation is an important part of reservoir description. The research work runs through the whole process of oil field exploration and development, and has important guiding significance to ensure the high efficiency and scientific development of oil field. Sand body heterogeneity, pore structure, physical property difference, percolation characteristics, etc. The Zhengshiwan area of Jingbian Oilfield is located in the central and southern part of northern Shaanxi slope in Ordos Basin. At present, the phenomenon of water channeling in the area of Chang 2 oil formation in this area leads to the high water cut of some oil wells, which affects the water injection development effect. Through the comprehensive evaluation of Chang 2 reservoir in the study area, the distribution law and macroscopic distribution of reservoir sand body are made clear. Microscopic heterogeneity and so on, delineate the distribution of favorable reservoir areas, and then provide the basis of reservoir geology for well pattern arrangement and the implementation of water injection development. This paper applies the relevant theoretical knowledge of sedimentology, petroleum geology and reservoir geology. By means of drilling log data analysis, core observation and description, and various reservoir test methods, fine formation division and correlation of Yanchang No. 2 formation in Zhengshiwan area were carried out. Reservoir sedimentary microfacies type identification and plane distribution characterization, and analysis of diagenesis and physical characteristics of reservoir, combined with macro and micro reservoir characteristics, comprehensive reservoir classification and evaluation, according to the cyclic correlation and marker layer recognition principles, Chang2 reservoir formation in Zhengshiwan area can be divided into 3 sand formations, in which Chang21 reservoir can be further divided into three sub-layers. Core observation and logging facies analysis show that the Chang 2 reservoir group in the study area mainly developed delta plain subfacies. Including distributary channel, distributary bay and other sedimentary microfacies, the source supply direction comes from the northeast of the study area. The single sand body depicts that the channel direction sand body connectivity is good, the vertical channel direction direction connectivity is poor, the Chang 2 reservoir rock is grayish white, The gray-green meso-fine feldspathic sandstone has undergone many diagenesis, among which constructive diagenesis, which is favorable to reservoir physical properties, includes dissolution and metasomatism, destructive diagenesis is mechanical and chemical compaction, cementation; The physical properties of a large number of core samples show that the Chang 2 reservoir is mainly medium porosity and low permeability reservoir, and the wettability and sensitivity analysis shows that Chang 2 is hydrophilic and has no weak velocity sensitivity. The results show that the heterogeneity of Chang 211 and 213 layers is stronger and the plane heterogeneity is weak. The heterogeneity between the layers of Chang 212 is weak, but the plane heterogeneity is relatively strong, the sedimentary microfacies, reservoir physical properties and the parameters related to heterogeneity are selected, and the cluster analysis method is used. The comprehensive evaluation of each sub-layer of Chang 21 sand formation has been carried out, and three types of reservoirs have been divided into good, medium and poor reservoirs. The initial production rate of production wells has been compared with that of existing production wells in the study area. The results of reservoir evaluation and prediction are verified. The distribution of favorable area of Chang 21 sand formation in the study area is mainly controlled by sedimentary microfacies distribution and diagenesis has obvious influence on physical properties and heterogeneity.
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.13
，

本文編號：1645462