發(fā)布時間：2018-05-14 01:14

  本文選題：新下Ⅱ油組 + 湖相白云巖��； 參考：《長江大學(xué)》2015年碩士論文

【摘要】：世界上一半的油氣資源都儲集在碳酸鹽巖中,從而使得湖相碳酸鹽巖研究在陸相含油氣盆地中的地位日益受到重視,因此,開展湖相碳酸鹽巖沉積、儲層特征及有利儲層分布預(yù)測研究對于指導(dǎo)油氣勘探有重要的意義。本文在對前人相關(guān)研究成果詳細(xì)調(diào)研的基礎(chǔ)上,以碳酸鹽巖沉積學(xué)、儲層地質(zhì)學(xué)及石油地質(zhì)學(xué)、測井地質(zhì)學(xué)、數(shù)理統(tǒng)計等基礎(chǔ)理論為指導(dǎo),充分利用鉆井、巖心、測井、地震及有機和無機地球化學(xué)特征分析等資料,對潛江凹陷南部新購地區(qū)新下Ⅱ油組湖相白云巖的地層發(fā)育特征、儲層特征、有利儲層分布預(yù)測等一系列問題進(jìn)行了系統(tǒng)的研究。通過對研究區(qū)巖石樣品的鏡下鑒定,結(jié)合X衍射分析,認(rèn)為研究區(qū)主要發(fā)育泥晶白云巖、陸屑泥晶白云巖、泥晶泥質(zhì)白云巖、白云質(zhì)泥巖、泥膏巖、膏泥巖和粉砂巖等七種類型的巖性。通過對取心段巖心深度歸位,分析統(tǒng)計不同類型巖性所對應(yīng)的測井響應(yīng)特征,考慮到測井識別巖性的準(zhǔn)確度及對主要儲層段進(jìn)行識別的目的,將七類巖性合并為白云巖類、泥巖類、泥膏巖和粉砂巖四大類巖性,在此基礎(chǔ)上應(yīng)用Fisher判別分析法建立不同類別巖性的測井識別模型,明確了白云巖儲層在全區(qū)的分布及變化規(guī)律。研究區(qū)新溝地區(qū)新下Ⅱ油組劃分為淺湖沉積一類大相,并進(jìn)一步把淺湖相化分為湖坪、淺湖砂壩和局限洼地三種亞相,其中湖坪可分為泥坪和云坪兩個微相,局限洼地可劃分為泥質(zhì)洼地和云質(zhì)洼地兩種微相類型。其中云坪微相和云質(zhì)洼地微相為研究區(qū)白云巖發(fā)育的主要微相類型：云坪微相主要發(fā)育于工區(qū)內(nèi)地勢相對較高的部位,其內(nèi)部生儲配置關(guān)系好,白云巖儲層物性較好,有利于油氣在內(nèi)部的流動,為研究區(qū)有利儲層發(fā)育的微相類型；云質(zhì)洼地微相主要形成于地勢低洼部位,內(nèi)部生儲配置關(guān)系差,白云巖單層厚度較大,物性差,內(nèi)部非均質(zhì)性較強,不利于油氣在內(nèi)部的流動,不能作為研究區(qū)有利儲層發(fā)育的微相類型。根據(jù)沉積特征的綜合分析,明確了研究區(qū)湖相碳酸鹽巖的發(fā)育主要受物源、古地貌和湖平面升降三種因素的綜合控制。儲層特征研究表明：研究區(qū)新下Ⅱ油組碳酸鹽巖儲層為中孔-特低滲儲層,碳酸鹽巖儲層儲集性能由好至壞依次為陸屑泥晶白云巖泥晶白云巖泥晶泥質(zhì)白云巖,沉積相是儲層物性好壞的主要控制因素。次生孔隙中的晶間孔隙為研究區(qū)主要儲集空間,原生微生物孔、特大孔隙、鑄模孔和溶蝕縫為次要的儲集空間,對儲層物性的改善貢獻(xiàn)不大。綜合已發(fā)現(xiàn)的油層及油氣顯示情況、古地貌特征、沉積相分布特征、有效白云巖厚度、儲層發(fā)育特征等,對研究區(qū)新下Ⅱ油組碳酸鹽巖儲層分布進(jìn)行預(yù)測。由新一區(qū)和新二區(qū)所為圍成的“C”字形區(qū)域內(nèi),處于構(gòu)造相對高部位,為三套含油層段中有效白云巖儲層疊合部位,為研究區(qū)有利儲層分布區(qū)帶；此外,由橋2井、新61井和西2井所圍成的一橢圓形區(qū)域內(nèi)和預(yù)測的有利區(qū)帶具有十分相似的地震屬性特征、沉積背景和構(gòu)造背景,可能成為有利儲層分布的遠(yuǎn)景區(qū)。
[Abstract]:Half of the world's oil and gas resources are stored in carbonate rocks, which makes the study of lacustrine carbonate rocks in the continental oil and gas basins more and more important. Therefore, it is of great significance to carry out the study of lacustrine carbonate deposits, reservoir characteristics and favorable reservoir distribution prediction for the guidance of oil and gas exploration. Based on the detailed investigation of the research results, guided by the basic theory of carbonate sedimentology, reservoir geology and petroleum geology, logging geology, mathematical statistics and so on, it makes full use of the data of drilling, core, logging, seismic and organic and inorganic geochemical characteristics analysis to the lake facies white of the new lower oil group in the south of the Qianjiang depression. A series of problems such as formation characteristics, reservoir characteristics and favorable reservoir distribution prediction have been systematically studied. Through the microscopic identification of rock samples in the study area and X diffraction analysis, it is believed that the research area mainly develops muddy dolomite, debris crystalline dolomite, muddy dolomite, dolomite mudstone, mudstone, gypsum mudstone and mudstone. Seven types of lithology, such as siltstone. By analyzing the depth of core depth in the core, the logging response characteristics of different types of lithology are analyzed and analyzed. Considering the accuracy of lithology identification and the identification of the main reservoir sections, the seven types of lithology are merged into four lithologies, such as dolomite, mudstone, mudstone and siltstone. On this basis, the Fisher discriminant analysis method is used to establish the logging identification model of different types of lithology, and the distribution and change law of the dolomite reservoir in the whole area is clarified. The new lower II oil group in the new valley area of the study area is divided into a kind of shallow lake facies, and the shallow lake facies is further divided into three subfacies, the lake flat, the shallow lake sand dam and the limited depression. The middle Lake flat can be divided into two microfacies of mud flat and Yunping, and the limited depressions can be divided into two types of microfacies in muddy and cloud lying areas, among which, Yunping microphase and cloud surface microfacies are the main microfacies types of dolomite development in the study area: Yunping microphase is mainly developed in the high position of potential facies in the inland area of the industrial area, and its internal storage and distribution relationship Well, the dolomite reservoir has good physical property, which is beneficial to the flow of oil and gas in the interior, and is the microfacies type of favorable reservoir development in the study area. The cloud low-lying micro facies are mainly formed in the low-lying areas, the internal reservoir distribution is poor, the dolomite monolayer thickness is large, the physical property is poor, the internal heterogeneity is strong, and it is not good for the internal flow of oil and gas. As a microfacies type of favorable reservoir development in the study area, according to the comprehensive analysis of sedimentary characteristics, it is clear that the development of lacustrine carbonate rocks in the study area is mainly controlled by three factors, which are main source, palaeogomorphic and lake level rise and fall. The study of reservoir characteristics shows that the carbonate reservoir of the new lower oil group in the study area is medium pore and ultra-low permeability reservoir, carbon The reservoir property of the acid salt rock reservoir is from good to bad. The sedimentary facies is the main controlling factor of the physical property of the reservoir. The intergranular pore in secondary pores is the main storage space in the study area, the primary micropore, the large pore space, the mold hole and the dissolution seam are the secondary storage space. There is little contribution to the improvement of reservoir physical properties. The distribution of carbonate reservoir in the new lower oil group in the study area is predicted by comprehensive discovery of oil and gas display, palaeogomorphic features, sedimentary facies distribution characteristics, effective dolomite thickness and reservoir development characteristics, and in the "C" shaped area enclosed by the new one and the new two areas. The relative high part of the structure is three sets of effective dolomite reservoir overlaps in the oil-bearing strata, which is a favorable reservoir distribution zone in the study area. In addition, it has very similar seismic attribute features in an elliptical area surrounded by well the 2 well, the new 61 well and the west 2 well, and the sedimentary background and tectonic setting may be favorable. A remote area of reservoir distribution.

【學(xué)位授予單位】：長江大學(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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