本文選題：鄂爾多斯盆地　切入點：延7油層組　出處：《長江大學》2017年碩士論文　論文類型：學位論文

【摘要】：鄂爾多斯盆地位于中國中西部地區(qū),是一個多旋回復合型盆地,蘊藏著十分充足的油氣資源,為中國第二大沉積盆地。本文研究地區(qū)為鄂爾多斯盆地演武地區(qū),研究區(qū)位于鄂爾多斯盆地的西南部,其構(gòu)造上位于伊陜斜坡西側(cè)的南端并處于天環(huán)坳陷的南部,構(gòu)造形態(tài)整體上表現(xiàn)為東西高,南北低的地勢,構(gòu)造較為簡單,局部地區(qū)發(fā)育多個近東西向的低幅鼻狀構(gòu)造和穹隆構(gòu)造,斷層不發(fā)育,基底無大型的隆起,繼承性發(fā)育特征明顯。近些年來對鄂爾多斯盆地西南部地區(qū)的勘探開發(fā),發(fā)現(xiàn)該地區(qū)侏羅系延安組具有較為可觀的油氣資源�，F(xiàn)在基于對侏羅系試采井區(qū)井點的研究和認識上,對于演武地區(qū)的總體認識還比較薄弱,演武支河谷兩側(cè)地層劃分與對比還需要進行精細比對,延安組的砂體在橫縱向上的變化規(guī)律還需要細致刻畫,對于儲集層和油藏的參數(shù)特征的研究還有待進一步深化。伴隨著油氣需求的劇增,供應壓力逐漸增加,但隨著勘探進程的不斷深入,勘探難度越來越大。此次論文研究較為全面的研究了演武地區(qū)侏羅系延安組延7油層組的地層分布特征、沉積體系特征、沉積微相類型、砂體形態(tài)展布以及儲層特征,為后期進一步研究工區(qū)成藏主控因素和分析油氣富集規(guī)律建立堅實的理論基礎。本文以鄂爾多斯盆地演武支河谷地區(qū)侏羅系延安組延7油層組為研究對象,系統(tǒng)運用地質(zhì)學理論基礎,以巖心資料、測錄井資料、部分鉆井資料為依托,并進行薄片、粒度、掃描電鏡、微量元素等多項分析化驗測試,對研究區(qū)延7油層組進行綜合性研究。運用標志層法、地層等厚法、沉積旋回法等理論,對沿7油層組進行精細地層劃分與對比,詳細分析了延7油層組地層分布關系、地層厚度以及巖電關系等規(guī)律,項目中通過地層研究建立了演武支河谷地區(qū)前侏羅系古地貌模型;根據(jù)巖心觀察、測錄井資料以及分析化驗資料,對延7油層組進行了沉積體系劃分、沉積微相識別、砂體平面展布以及儲層特征的研究。本次論文對研究區(qū)內(nèi)470口井進行小層的劃分與對比,建立了20條地層對比剖面,其中順物源方向5條,垂直物源方向6條。對比結(jié)果表明,研究區(qū)地層連續(xù)性較好,地層厚度穩(wěn)定,延7油層組頂部煤層發(fā)育,穩(wěn)定發(fā)育1-2套厚度約為10m左右的煤層,底部同樣發(fā)育較穩(wěn)定的煤層。根據(jù)旋回特征和地層等厚原則可將延7油層組劃分為延71段和延72段,延71段厚度約為15-25m延72段厚度約為20-35m。研究區(qū)延7油層組為河流三角洲沉積體系,本文觀點認為該地區(qū)辮狀河三角洲沉積體系,主要為三角洲平原亞相,發(fā)育有分流河道、河間洼地、天然堤、沼澤等沉積微相,建立了延7油層組沉積期沉積模式。延7油層組沉積期主要以分流河道中的砂體沉積為主,砂體呈條帶狀分布,順物源方向由南西-北東向延伸。砂體巖性較粗,以細砂巖、粗-中砂巖為主,發(fā)育有槽狀交錯層理、板狀交錯層理、塊狀層理。研究表明演武支河谷地區(qū)延7油層組為低-中滲透儲層,孔隙結(jié)構(gòu)以中-粗喉為主,總體物性較好,巖性主要以巖屑質(zhì)長石砂巖為主,其次是長石質(zhì)巖屑砂巖,其中石英總量為62.59%,長石總量為19.66%,巖屑總量為17.75%。延7油層組平均孔隙度為14.55%,平均滲透率為23.12×10-3μm2。物性由上至下呈遞減的變化趨勢。
[Abstract]:Erdos basin is located in the central and western regions China, is a multi cycle composite basin, there are abundant oil and gas resources, as Chinese second sedimentary basin. This study area for Erdos basin in the study area is located in the Ordos Yanwu area, the southwest part of the basin, its structure is located on the west side of the southern Yishan slope and in the days of the ring the southern part of the depression, structure of the overall performance of things, North and south is low, the structure is relatively simple, the development of a nearly East-West low amplitude nose structure and dome structure in local area, the faults are not developed, no large basement uplift, developed distinctive characteristics. In recent years of exploration and development in Southwest China part of Erdos basin, found the Jurassic Yanan group has considerable oil and gas resources. Based on the present study and understanding of the Jurassic testing well well point area, for demonstration The overall area is still relatively weak, Yanwu Branch Valley on both sides of the stratigraphic division and comparison also requires fine alignment, the sand body of Yanan group in the horizontal and vertical changes require detailed characterization, for the study of characteristics of reservoir and reservoir to be further deepened. Along with the oil and gas supply demand growth. The pressure gradually increased, but with the deepening of the process of exploration, exploration is more and more difficult. This paper researched Yanwu area Jurassic Yanan group delay 7 reservoir strata distribution, sedimentary characteristics, sedimentary microfacies, sand body distribution and reservoir characteristics, for the later further research into the work area the main control factors of reservoir and analysis of oil and gas enrichment law to establish a solid theoretical foundation. In this paper, Erdos basin Valley Branch Yanwu Yan 7 oil-bearing formation of Jurassic system in Yanan as research object, The system used geology theory, with core data, logging data, drilling data as the basis, and sheet size, scanning electron microscope, trace elements and other analysis laboratory tests, comprehensive study of Yan 7 reservoir group. The use of the logo layer, the thickness of strata, sedimentary cycle theory etc. and the fine stratigraphic classification and correlation along the 7 formation, a detailed analysis of the Yan 7 oil-bearing strata, strata thickness and rock electricity relation law, through the formation of a valley before Yanwu Jurassic palaeogeomorphology model project; according to the core observation, logging data and analysis data of the Yan 7 oil-bearing was divided into sedimentary system, sedimentary facies identification, Study on sand body distribution and reservoir characteristics. This paper dividing and comparing the small layer on the 470 wells in the study area, set up 20 Profile comparison, which source direction along vertical direction of source 5, 6. The comparison results show that the strata in the study area has good continuity, thickness of the strata is stable, the Yan 7 oil-bearing top coal development, stable development of 1-2 sets of thickness is about 10m of the coal seam is also relatively stable. According to the development of the bottom cycle the characteristics and principle of the thickness of strata can be divided into Yin Yan 7 reservoir group 71 and Yan 72, Yan 71 section thickness of about 15-25m thickness of about 72 Yan Yan 7 reservoir group 20-35m. study area for River delta depositional system, this view is that the Braided River Delta sedimentary system in the area, mainly for delta plain subfacies developed distributary channel, natural levee, interchannl-depression, swamp sedimentary microfacies, sedimentary model is established. 7 formation sedimentary period. The Yan 7 oil-bearing sedimentary sandbody mainly in the distributary channel, sand body was strip shape, smooth material The source direction from SW-NE direction. Lithologic coarse to fine sandstone, coarse sandstone in development, trough cross bedding, tabular cross bedding, massive bedding. Research shows that the Branch Valley Yanwu Yan 7 reservoir group in low permeability reservoir, the pore structure mainly consists of - throat, overall good physical property and lithology mainly lithic feldspar sandstone, followed by feldspathic lithic sandstone, quartz feldspar which amount to 62.59%, a total of 19.66%, the total 17.75%. of cuttings Yan 7 oil-bearing average porosity is 14.55% and the average permeability is the change trend of 23.12 * 10-3 m2. were decreasing from top to bottom.

【學位授予單位】：長江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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