本文選題：讓53致密區(qū) + 巖石學(xué)特征��； 參考：《長(zhǎng)江大學(xué)》2015年碩士論文

【摘要】：讓53致密區(qū)位于松遼盆地南部中央坳陷區(qū)長(zhǎng)嶺凹陷中部,北東接兩井構(gòu)造、北西為乾215井區(qū),西南鄰乾安構(gòu)造,區(qū)域上為向西南傾的斜坡帶,是吉林油田致密油氣勘探開發(fā)的重點(diǎn)區(qū)域之一。研究區(qū)區(qū)域面積約260km2,共有52口井,目的層段為泉四段(K1q‘)的扶余油層。隨著油田勘探開發(fā)程度不斷加深,越來(lái)越多的地質(zhì)問(wèn)題諸如儲(chǔ)層特征不清、儲(chǔ)層主控因素不明等逐步暴露出來(lái)。針對(duì)研究區(qū)所存在的問(wèn)題,本文立足于沉積學(xué)、石油地質(zhì)學(xué)等基礎(chǔ)理論,以高精度層序地層學(xué)等為指導(dǎo),建立了精細(xì)的等時(shí)地層格架；依托于周圍密井區(qū)資料,從點(diǎn)-線-面深入研究?jī)?chǔ)層沉積微相特征,并運(yùn)用沉積體系分析等理論開展沉積微相平剖面分布特征及空間演化規(guī)律研究；在此基礎(chǔ)上,結(jié)合測(cè)井、鉆錄井、巖心樣品的分析測(cè)試數(shù)據(jù)等資料,從泉四段儲(chǔ)層巖石學(xué)特征、成巖作用、微觀孔隙結(jié)構(gòu)及儲(chǔ)層物性特征等方面展開研究,明確儲(chǔ)層特征,并運(yùn)用定性與定量方法對(duì)儲(chǔ)層進(jìn)行評(píng)價(jià),合理預(yù)測(cè)有利區(qū),為研究區(qū)有效儲(chǔ)層分布范圍落實(shí)及精細(xì)油藏評(píng)價(jià)提供理論依據(jù)。依據(jù)測(cè)井資料綜合解釋和巖心觀察,運(yùn)用高分辨率層序地層學(xué)與巖石地層學(xué)等理論,把握點(diǎn)-線-面三位一體的整體思路,從標(biāo)準(zhǔn)井出發(fā)開展小層劃分與對(duì)比工作,建立了研究區(qū)52口井目的層段內(nèi)的精細(xì)地層格架,即4個(gè)砂組13個(gè)小層的地層體系,為后續(xù)儲(chǔ)層的研究奠定了基礎(chǔ)。根據(jù)測(cè)井曲線特征、取心井的巖心觀察和粒度分析等,結(jié)合區(qū)域沉積背景,借助于周圍密井區(qū)資料,開展沉積相研究,結(jié)果表明研究區(qū)總體為辮狀河三角洲沉積體系,其物源主要來(lái)自于西南的通榆-�？邓�,并受東南部懷德-長(zhǎng)春水系弱影響。在這個(gè)沉積體系里主要發(fā)育三角洲平原和三角洲前緣兩個(gè)亞相,三角洲平原亞相又以分流河道、分流間灣、漫溢砂和決口扇等微相發(fā)育為主,三角洲前緣亞相則主要發(fā)育水下分流間灣、水下分流河道、席狀砂和河口壩等微相。Ⅳ砂組為高能遠(yuǎn)岸三角洲平原,III砂組發(fā)育低能遠(yuǎn)岸三角洲平原,II砂組發(fā)育近岸三角洲平原,I砂組則為三角洲前緣。依據(jù)研究區(qū)普通薄片、鑄體薄片、掃描電鏡等分析化驗(yàn)資料,從成分和結(jié)構(gòu)兩方面研究?jī)?chǔ)層巖石學(xué)特征,同時(shí)對(duì)儲(chǔ)層成巖作用進(jìn)行了深入細(xì)致的分析。結(jié)果表明,研究區(qū)泉四段砂巖主要為長(zhǎng)石砂巖、長(zhǎng)石質(zhì)巖屑砂巖和巖屑質(zhì)長(zhǎng)石砂巖,分選中等-好,顆粒接觸關(guān)系以線接觸為主,磨圓主要為次棱角狀；儲(chǔ)層填隙物中雜基成分主要是泥質(zhì)及泥晶灰質(zhì)；膠結(jié)物普遍發(fā)育,主要有：方解石、自生石英、長(zhǎng)石加大等,膠結(jié)類型以孔隙式膠結(jié)為主。研究區(qū)泉四段儲(chǔ)層整體處于中成巖A階段,經(jīng)歷了一系列的成巖作用,其中壓實(shí)作用、膠結(jié)作用、交代作用均降低砂巖儲(chǔ)集體的原生孔隙,導(dǎo)致物性變差；而溶蝕作用雖利于次生孔隙的生成,但溶蝕程度較弱,不足以改善儲(chǔ)層物性。通過(guò)分析鑄體薄片、普通薄片和掃描電鏡等資料顯示研究區(qū)孔隙類型為原生粒間剩余孔、粒間溶孔、長(zhǎng)石溶孔、巖屑溶孔、鑄�？�、微裂隙等六種,其中原生粒間剩余孔發(fā)育較少,以粒間溶孔為主�？紫督M合類型主要為粒間溶孔一粒內(nèi)溶孔。喉道類型有孔隙縮小型喉道、片狀或彎片狀喉道和微喉道三類,主要發(fā)育彎片狀喉道和微喉道兩種類型。根據(jù)壓汞資料,在對(duì)孔隙結(jié)構(gòu)參數(shù)分布情況和毛管壓力曲線特征的分析基礎(chǔ)上,將研究區(qū)孔隙結(jié)構(gòu)分為四類：Ⅰ類為低孔細(xì)喉,為較好有效儲(chǔ)層；Ⅱ類為低-特低孔微細(xì)喉,為一般有效儲(chǔ)層；Ⅲ類為特低孔微細(xì)喉,經(jīng)改造可以形成工業(yè)油流；Ⅳ類為特低-超低孔微細(xì)喉,基本為無(wú)效儲(chǔ)層。研究區(qū)儲(chǔ)層孔隙結(jié)構(gòu)復(fù)雜,中值半徑偏小,排驅(qū)壓力相對(duì)較高,退汞效率低,最大進(jìn)汞飽和度高,多偏略粗歪度,儲(chǔ)油性能相對(duì)較好,但巖石總孔隙度中有效孔隙度較低,儲(chǔ)層滲流能力差。通過(guò)研究表明：研究區(qū)泉四段儲(chǔ)層整體孔隙度以低孔-特低孔為主,滲透率以超低滲為主；研究區(qū)儲(chǔ)層的顆粒組份、沉積(微相)和膠結(jié)物類型為儲(chǔ)層物性的主控因素；早期充分壓實(shí)作用和中期巖屑等顆粒普遍黏土化、硅化成巖,很大程度降低了原生孔隙；后期碳酸鹽膠結(jié)物的孔隙式膠結(jié)進(jìn)一步阻塞孔隙及孔隙間的連通,降低儲(chǔ)層物性；溶蝕作用雖有利于次生孔隙發(fā)育,但強(qiáng)度較弱,意義不大,儲(chǔ)層總體致密化。針對(duì)儲(chǔ)層的綜合性能,選用巖性(粒度、成分、泥質(zhì)含量)、物性(孔隙度、滲透率)、孔隙結(jié)構(gòu)(孔喉中值半徑、排驅(qū)壓力)、成巖相、含油性(含油飽和度)、有效厚度及試油日產(chǎn)等參數(shù)作為儲(chǔ)層綜合評(píng)價(jià)的特征參數(shù),對(duì)研究區(qū)儲(chǔ)層進(jìn)行綜合評(píng)價(jià),并分為一類、二類、三類、四類。研究區(qū)目的層以四類儲(chǔ)層為主,占34.21%,三類儲(chǔ)層次之,占30.14%,一類、二類儲(chǔ)層所占比例相近,分別為17.68%、17.97%。其中,Ⅱ、Ⅲ砂組儲(chǔ)層綜合類型最好,I砂組次之,Ⅳ砂組儲(chǔ)層綜合類型最差；一類儲(chǔ)層綜合類型在Ⅲ砂組最為發(fā)育,所占比例為19.10%；二類儲(chǔ)層綜合類型在Ⅲ砂組最為發(fā)育,所占比例為22.47%；三類儲(chǔ)層綜合類型在Ⅰ砂組最為發(fā)育,所占比例為31.78%；四類儲(chǔ)層綜合類型在Ⅳ砂組最為發(fā)育,所占比例為43.24%。綜合沉積相特征、油氣成藏規(guī)律及儲(chǔ)層綜合評(píng)價(jià)結(jié)果對(duì)研究區(qū)進(jìn)行有利勘探區(qū)篩選,將儲(chǔ)層有利區(qū)分為一、二、三類：其中一類最優(yōu),二類次之,三類一般。
[Abstract]:The 53 dense area is located in the central Changling depression in the southern central depression of the Songliao Basin, the north east of the two well structure, the west to the dry 215 well, the southwest adjacent to the Qian an structure and the south-west slope zone, which is one of the key areas in the exploration and development of the dense oil and gas in the Jilin oilfield. The area of the study area is about 260km2, with a total of 52 wells. The target section is the target zone. The Fuyu oil layer of the four section of the spring (K1q). With the deepened exploration and development of the oilfield, more and more geological problems such as reservoir characteristics are not clear, and the main controlling factors of the reservoir are gradually exposed. In view of the problems existing in the study area, this paper is based on the basic theory of sedimentology, petroleum geology and so on, with high precision sequence stratigraphy, etc. A fine isochronous stratigraphic framework is set up. Based on the data of the surrounding well area, the characteristics of the sedimentary microfacies of the reservoir are deeply studied from the point to line surface, and the characteristics of the flat profile distribution and the spatial evolution of the sedimentary microfacies are carried out by the theory of sedimentary system analysis. On this basis, the analysis and testing of the samples of the logging, drilling and core are combined with the theory of logging. Data such as data, such as petrological characteristics, diagenesis, micropore structure and physical properties of reservoir in the four section of the spring, clarify the reservoir characteristics, and use qualitative and quantitative methods to evaluate the reservoir, reasonably predict the favorable area, and provide a theoretical basis for the implementation of the effective reservoir distribution and the fine reservoir evaluation in the study area. Based on the comprehensive interpretation of well logging data and core observation, using the theory of high resolution sequence stratigraphy and rock stratigraphy, the whole idea of the trinity of point line and surface is grasped, the small layer division and contrast work is carried out from the standard well, and the fine stratigraphic framework within the target layer of the 52 wells in the study area is established, that is, the land of the 13 small layers of the 4 sand groups. The layer system has laid the foundation for the study of the subsequent reservoir. According to the characteristics of the logging curve, the core observation and grain size analysis of the core well, combined with the sedimentary background of the region, the sedimentary facies study is carried out with the aid of the data of the surrounding well area. The results show that the study area is generally a braided river delta depositional system, and its source is mainly from the Tongyu in the southwest. Baokang water system is affected by the weak influence of the huild Changchun water system in the southeast. In this depositional system, the delta plain and the delta front are mainly developed in two subfacies. The delta plain subfacies mainly consists of distributary channel, inter distributary Bay, overflow sand and crevasse fan, while the delta front subfacies mainly develops underwater distributary Bay and subaqueous subdivision. III sand group developed low energy and far shore delta plain, II sand group developed near shore delta plain, and I sand group was a delta front. According to the analysis of ordinary thin slices, cast thin slices and scanning electron microscope, the two aspects of composition and structure were studied. The reservoir petrological characteristics and reservoir diagenesis are analyzed in detail. The results show that the sandstone in the four section of the spring of the study area is mainly feldspar sandstone, feldspar sandstone and lithic feldspar sandstone, and the separation of sandstone and lithic feldspar sandstone is medium good, the contact relation of the particles is mainly line contact, the grinding circle is mainly the sub angle angle, and the clutter in the reservoir filling material is complex. Mainly mud and muddy gray matter, the cementation is widely developed, mainly: calcite, authigenic quartz, feldspar and so on, and the cementation type is mainly porous cementation. The reservoir of the four section of the study area is in the A stage of the middle diagenesis, and experienced a series of diagenesis, in which the compaction, cementation and metasomatism reduce the sandstone reservoir. The primary porosity leads to the deterioration of the physical property, while the dissolution is beneficial to the formation of secondary pores, but the degree of corrosion is weak, and it is not enough to improve the physical properties of the reservoir. By analyzing the casting thin slices, ordinary thin slices and scanning electron microscopy, the pore types of the study area are primary intergranular residual pores, intergranular dissolution pores, rock dissolution pores, mold holes, micro casting holes, and micro pores. There are six kinds of fissure, among which the primary intergranular residual pores are less developed and intergranular pore is the main type. The main type of pore combination is intergranular dissolution pore. There are three types of laryngeal tract types: pore narrow throat, flaky or curved larynx and microlarynx, which mainly develop two types of curved larynx and microlarynx. On the basis of the analysis of the distribution of parameters and the characteristics of the capillary pressure curve, the pore structure of the study area is divided into four types: the type I is a low pore fine throat and a better effective reservoir; the second class is a low ultra low pore microlarynx, which is a general effective reservoir; class III is a ultra-low pore throat, and the industrial oil flow can be formed by transformation; type IV is ultra low and ultra-low pore. In the study area, the pore structure of the study area is complex, the middle value radius is small, the displacement pressure is relatively high, the efficiency of the mercury withdrawal is low, the maximum mercury saturation is high, the oil performance is relatively good, but the effective porosity is low in the total porosity of the rock, and the reservoir seepage ability is poor. Through the study, the study area spring four The overall porosity of the reservoir is dominated by low porosity and ultra-low porosity, and the permeability is dominated by ultra low permeability. The grain components of the reservoir, the sedimentary (micro phase) and the cementation are the main controlling factors of the reservoir physical property; the early full compaction and the medium cuttings are generally clay and silicon formed rock, which greatly reduces the primary pore; later carbon. The pore type cementation of the acid salt cements further obstructs the connectivity between pores and pores and reduces the physical property of the reservoirs. Although the dissolution is beneficial to the development of secondary pores, the strength is weak, and the significance of the reservoir is not significant, and the reservoir is generally densified. In accordance with the comprehensive properties of the reservoir, the lithology (particle size, composition, mud content), physical property (porosity, permeability) and pore junction are selected. Structure (pore throat median radius, displacement pressure), petrographic facies, oil-bearing (oil saturation), effective thickness and oil test daily production parameters as the characteristic parameters of reservoir comprehensive evaluation, comprehensive evaluation of reservoir reservoirs, and divided into one class, two types, three types, four types. The target layer of the research area is dominated by four types of reservoirs, three types of reservoir, accounting for 30.. The 14%, one class, two types of reservoirs are similar, respectively 17.68%, 17.97%., respectively, II, II, III sand formation of the best comprehensive type of reservoir, I sand group, the worst reservoir type, the most comprehensive type of reservoir in the third sand group, the proportion of 19.10%; the two type of reservoir comprehensive type in the third sand group is the most developed, accounting for 22 of the proportion. .47%; the three types of reservoir comprehensive types are the most developed in the I sand group, and the proportion is 31.78%. The four type of reservoir comprehensive type is the most developed in the IV sand group, and the proportion is the 43.24%. comprehensive sedimentary facies. The oil and gas accumulation law and the comprehensive evaluation result of the reservoir are screened in the favorable exploration area, and the reservoir is divided into one, two, and three types. One of the best, the two and the three is general.
【學(xué)位授予單位】：長(zhǎng)江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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相關(guān)期刊論文 前8條

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本文編號(hào)：1909778