本文選題：川西北地區(qū) + 棲霞組—茅口組�。� 參考：《西南石油大學(xué)》2017年碩士論文

【摘要】：在充分調(diào)研前人研究成果的基礎(chǔ)上,通過(guò)觀察四川盆地川西北地區(qū)棲霞組—茅口組的多條重點(diǎn)野外剖面,分析和整理多口單井的鉆錄測(cè)井及分析化驗(yàn)資料,結(jié)合區(qū)域構(gòu)造背景和巖相古地理概況,對(duì)研究區(qū)目的層段的地層特征、沉積相類型與特征以及儲(chǔ)層特征展開(kāi)了研究。地層研究方面,本文依據(jù)出露地層的顏色、厚度、產(chǎn)狀、沉積構(gòu)造、接觸關(guān)系、沉積旋回及古生物等宏觀標(biāo)志,總結(jié)了棲霞組—茅口組各層段的野外露頭特征;結(jié)合已有鉆井電測(cè)曲線反映出來(lái)的巖電關(guān)系,明確了目的層段內(nèi)重要的地質(zhì)界線特征,繼而對(duì)研究區(qū)內(nèi)目的層段的地層厚度特征、縱橫向及平面展布規(guī)律做了研究。沉積相研究方面,在充分認(rèn)識(shí)了研究區(qū)及其鄰區(qū)的沉積背景后,根據(jù)豐富的沉積相標(biāo)志,本文將川西北地區(qū)棲霞組—茅口組的沉積模式歸納為了具有臺(tái)地邊緣的緩坡型臺(tái)地模式,總結(jié)了臺(tái)地邊緣、淺緩坡、深緩坡、斜坡～盆地4類亞相各自的沉積特征。在對(duì)典型剖面和鉆井做了縱橫向上的沉積相劃分后,針對(duì)儲(chǔ)層段最為發(fā)育的棲二段、茅三段研究了平面上的相帶展布規(guī)律,最終認(rèn)為古地貌、古構(gòu)造、同期海平面升降等因素共同影響了沉積相的演化與展布。為了將有關(guān)川西北地區(qū)棲霞組—茅口組沉積相的認(rèn)識(shí)與生產(chǎn)實(shí)際相聯(lián)系,本文對(duì)研究區(qū)目的層沉積相與儲(chǔ)層之間的關(guān)系展開(kāi)了進(jìn)一步的剖析。在對(duì)儲(chǔ)層的儲(chǔ)集巖類型、儲(chǔ)滲空間類型、儲(chǔ)層物性特征和縱橫向分布規(guī)律有了了解后,通過(guò)分析和對(duì)比不同沉積相帶中的儲(chǔ)層發(fā)育特征,發(fā)現(xiàn):研究區(qū)西部地勢(shì)高的臺(tái)地邊緣相以顆粒灘沉積為主,又以處于微地貌高地的灘核最易受暴露,利于后期溶蝕作用及白云化作用的改造,形成的“砂糖狀”晶粒白云巖為區(qū)內(nèi)最優(yōu)質(zhì)的孔隙型儲(chǔ)層;相鄰的微地貌較低地(如灘翼)則儲(chǔ)集性能欠佳。而研究區(qū)東部低地勢(shì)的緩坡相帶中以低能沉積為主,基本不具儲(chǔ)集性;僅零星分布在局部地貌高地的點(diǎn)灘或點(diǎn)礁能受到后期成巖作用的微弱改造,儲(chǔ)集性能雖差,但在后期構(gòu)造運(yùn)動(dòng)影響下可能形成非均性較強(qiáng)的裂縫—孔隙型儲(chǔ)層。所以,本文認(rèn)為:沉積微地貌控制著沉積相帶的巖性組成和后期成巖作用的進(jìn)行,繼而控制了儲(chǔ)層的分布和物性特征。
[Abstract]:On the basis of full investigation of previous research results, by observing several key field sections of Qixia formation and Maokou formation in northwestern Sichuan Basin, the drilling logging and laboratory data of many single wells are analyzed and arranged.Combined with regional tectonic background and lithofacies paleogeography, the stratigraphic characteristics, sedimentary facies types and characteristics and reservoir characteristics of the target formation in the study area are studied.In stratigraphic research, the characteristics of outcrop in the field of Qixia formation and Maokou formation are summarized according to the macroscopic markers of the outcrop, such as color, thickness, occurrence, sedimentary structure, contact relation, sedimentary cycle and paleontology.Combined with the relationship between rock and electricity reflected by the electric logging curves of drilling wells, the important geological boundary characteristics in the target zone are defined, and the characteristics of formation thickness, longitudinal and horizontal distribution and plane distribution of the target interval in the study area are studied.In the aspect of sedimentary facies research, after fully understanding the sedimentary background of the study area and its adjacent areas, according to the rich sedimentary facies marks,In this paper, the sedimentary models of Qixia formation and Maokou formation in northwestern Sichuan are summarized as the gentle slope platform model with platform margin, and the sedimentary characteristics of platform margin, shallow gentle slope, deep gentle slope and slope ~ basin are summarized.After dividing typical sections and drilling sections vertically and horizontally, aiming at the most developed member of the reservoir, the third member of Mao studies the distribution of facies belt on the plane, and finally concludes that paleogeomorphology, paleotectonics, paleotectonics, paleogeomorphology, paleotectonics,The evolution and distribution of sedimentary facies are influenced by sea level fluctuation and other factors.In order to relate the understanding of the sedimentary facies of Qixia formation to Maokou formation in northwestern Sichuan with the actual production, the relationship between the sedimentary facies and the reservoir of the target layer in the study area has been further analyzed in this paper.After understanding the reservoir rock types, reservoir permeability space types, reservoir physical properties and vertical and horizontal distribution, the reservoir development characteristics in different sedimentary facies zones are analyzed and compared.It is found that the high terrace margin facies in the western part of the study area are dominated by granular beach deposits, and the beach nuclei located in the microgeomorphological highlands are the most vulnerable to exposure, which is conducive to the alteration of late dissolution and dolomitization.The "granulated" grain dolomite is the best porous reservoir in the area, while the adjacent microgeomorphological low ground (such as the beach wing) has poor reservoir performance.In the east of the study area, the gentle slope facies belt of low terrain is dominated by low energy deposition, which is basically not reservoir, and only scattered in the local geomorphologic highlands can be changed weakly by late diagenesis, and the reservoir performance is poor.However, under the influence of late tectonic movement, fractured and porous reservoirs with strong heterogeneity may be formed.Therefore, the sedimentary microgeomorphology controls the lithologic composition and late diagenesis of the sedimentary facies zone, and then controls the distribution and physical characteristics of the reservoir.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.13

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本文編號(hào)：1767879