本文選題：灘壩砂體 + 層序地層�。� 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：本論文研究區(qū)為東營(yíng)凹陷博興洼陷重點(diǎn)區(qū)塊,研究層位為沙四上亞段。綜合研究區(qū)地層特征和構(gòu)造背景,以層序地層學(xué)、沉積學(xué)、測(cè)井地質(zhì)學(xué)、盆地模擬等理論為指導(dǎo),運(yùn)用巖心、測(cè)錄井、地震、分析測(cè)試資料,在單井層序劃分、連井層序?qū)Ρ鹊幕A(chǔ)上,建立全區(qū)層序地層格架,在層序地層格架內(nèi)對(duì)灘壩砂體進(jìn)行精細(xì)解剖,重點(diǎn)研究灘壩主力發(fā)育層位中不同類型砂體的垂向演化和平面展布特征,并通過(guò)綜合分析對(duì)控制砂體發(fā)育的主要參數(shù)進(jìn)行定量恢復(fù),從而進(jìn)行砂體分布的預(yù)測(cè)。主要成果與認(rèn)識(shí)如下:1、層序地層研究:應(yīng)用層序地層學(xué)原理和方法,將研究區(qū)沙四上亞段劃分為1個(gè)三級(jí)層序,由下至上包括低位域、湖侵域和高位域3個(gè)體系域。其中低位域精細(xì)劃分為3個(gè)準(zhǔn)層序組,呈進(jìn)積式疊加樣式;湖侵域包括2個(gè)準(zhǔn)層序組,呈退積式疊加樣式;高位域包括2個(gè)準(zhǔn)層序組,呈進(jìn)積/加積式疊加樣式。最終確定層序地層劃分方案,建立研究區(qū)的層序地層格架。2、砂體沉積特征研究:研究區(qū)沙四上亞段的沉積環(huán)境主要為濱淺湖,灘壩的沉積特征明顯。研究區(qū)沿岸發(fā)育礫質(zhì)灘壩,內(nèi)部受波浪影響較大,主要發(fā)育近岸壩砂及壩間灘砂沉積,由湖岸到湖盆內(nèi)部砂體分帶性明顯。通過(guò)巖心、測(cè)錄井資料、地震資料綜合分析,總結(jié)了不同類型的灘壩砂體在巖心、測(cè)錄井、地震上的主要特征。低位域沉積時(shí)期,基準(zhǔn)面下降,物源的供給充足,湖盆內(nèi)部灘壩砂體大量發(fā)育;湖侵域沉積時(shí)期,基準(zhǔn)面上升,物源供給范圍縮小,湖盆內(nèi)部砂體幾乎不發(fā)育;高位域沉積時(shí)期,基準(zhǔn)面緩慢上升到緩慢下降,相比湖侵域沉積時(shí)期物源供給范圍增大,湖盆內(nèi)部砂體零星分布。3、灘壩主控參數(shù)定量化:大規(guī)模灘壩的形成需要一定的物源供給、合適的古水深。同時(shí),古地貌影響湖盆中砂體的展布,風(fēng)力作為灘壩形成的原始動(dòng)力,對(duì)灘壩砂體的形成與分布也具有一定的控制作用。在層序劃分、砂體沉積特征分析的基礎(chǔ)上,選取灘壩重點(diǎn)發(fā)育時(shí)期,采用不同定量恢復(fù)方法對(duì)各主控參數(shù)進(jìn)行定量化。研究區(qū)的灘壩砂體受控于魯西隆起處的基巖,屬于基巖—灘壩沉積體系,南部金家緩坡帶為主要物源區(qū);針對(duì)灘壩砂體的特點(diǎn),利用浪成波痕法與壩砂厚度法結(jié)合定量研究區(qū)古水深,約2~9米,水體較淺,反映強(qiáng)水動(dòng)力條件,壩砂體發(fā)育的水深大于灘砂體發(fā)育的水深;古地貌整體坡度較小,呈現(xiàn)北低南高的地勢(shì),地層由南向北傾斜,北部發(fā)育次洼區(qū),是接受灘壩沉積的主要區(qū)域;通過(guò)計(jì)算古風(fēng)速對(duì)研究區(qū)古風(fēng)力進(jìn)行定量恢復(fù),確定低位域沉積時(shí)期風(fēng)級(jí)為5~7級(jí),該風(fēng)力中等,是形成灘壩薄互層砂體的理想條件。4、砂體分布預(yù)測(cè):綜合控制灘壩發(fā)育的主要參數(shù),實(shí)現(xiàn)研究區(qū)灘壩發(fā)育重點(diǎn)層位不同類型砂體分布范圍與發(fā)育規(guī)模的預(yù)測(cè)。
[Abstract]:The study area is the key block of Boxing sag in Dongying Sag, and the study horizon is the upper part of Sha 4. According to the theories of sequence stratigraphy, sedimentology, logging geology and basin simulation, the stratigraphic characteristics and tectonic background of the study area are synthetically studied, and the core, logging, seismic, analysis and test data are used to divide the sequence in a single well. On the basis of sequence correlation, the sequence stratigraphic framework of the whole area is established, and the fine anatomy of beach bar sand body is carried out in the sequence stratigraphic framework. The vertical evolution and plane distribution characteristics of different types of sand bodies in the main developed horizon of beach dam are studied emphatically. Through comprehensive analysis, the main parameters controlling the development of sand body are quantitatively restored, and the distribution of sand body is predicted. The main achievements and understandings are as follows: 1. Sequence stratigraphy: by using the principle and method of sequence stratigraphy, the upper submember of Sha 4 in the study area is divided into a third order sequence, which consists of three system tracts from the bottom to the top, including the lowstand domain, the lacustrine transgressive domain and the high level tract. The lowstand region is divided into three quasequence groups, which are precession superimposed; the lacustrine transgression area consists of two quasequence groups with retrogradation superposition style; and the high position domain consists of two quasequence groups, which are progradation / accretion superposition style. Finally, the sequence stratigraphic division scheme was determined, and the sequence stratigraphic framework of the study area was set up. The sedimentary characteristics of sand body were studied. The sedimentary environment of the upper member of Sha 4 in the study area was mainly shoreside shallow lake, and the sedimentary characteristics of beach and dam were obvious. In the study area, there are gravelly beach dams developed along the coast of the study area, and the inner banks are influenced by the waves, mainly the inshore bar sand and the interdam beach sand deposits, and the zonation of sand bodies from the lake shore to the interior of the lake basin is obvious. Through comprehensive analysis of core, logging data and seismic data, the main characteristics of different types of sand bodies in core, logging and seismic are summarized. During the period of low level sedimentation, the datum level decreased, the supply of provenance was sufficient, and the sandbody of beach and dam developed in the lake basin, and in the period of lake transgression, the datum level increased, the supply range of material source decreased, and the sand body inside lake basin was almost undeveloped. In the period of high level sedimentation, the datum level rose slowly to a slow decrease, and the supply range of provenance increased compared with the period of lake transgression. The sand bodies in the lake basin are distributed sporadically, and the main control parameters of the beach dam are quantified: the formation of the large scale beach dam needs a certain supply of material sources and an appropriate ancient water depth. At the same time, the paleogeomorphology affects the distribution of sand bodies in the lake basin, and the wind force, as the original driving force of beach dam formation, also controls the formation and distribution of beach and dam sand bodies. On the basis of sequence division and analysis of sedimentary characteristics of sand bodies, different quantitative restoration methods are used to quantify the main control parameters in the key development period of beach and dam. The beach bar sand body in the study area is controlled by the bedrock in the western Luxi uplift, which belongs to the bedrock beach dam sedimentary system, and the Jinjia gentle slope belt in the south is the main source area, in view of the characteristics of the beach bar sand body, The ancient water depth of the area is about 2 ~ 9 meters, which reflects the strong hydrodynamic condition. The water depth of the dam sand body is larger than that of the beach sand body, and the overall slope of the paleogeomorphology is smaller, and the water depth of the dam sand body is larger than that of the beach sand body. It is the main area of receiving beach and dam sedimentation, the paleo-wind speed is calculated and the paleo-wind force in the study area is quantitatively restored, and the wind grade of low-lying area is determined to be 5 ~ 7 grade by calculating paleo-wind speed, and the formation is inclined from the south to the north, and the sub-depression area is developed in the north, which is the main area where the paleo-wind force is recovered. The wind is moderate, and it is the ideal condition for forming the thin interbedded sand body of beach and dam. The sand body distribution is predicted: the main parameters of the development of beach and dam are controlled synthetically, and the distribution range and development scale of different types of sand bodies in key layers of beach and dam development in the study area are forecasted.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【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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