【摘要】：鄂爾多斯盆地是我國最早發(fā)現(xiàn)油田的盆地之一,也是我國第二大含油氣盆地,油氣資源豐富。隨著鄂爾多斯盆地石油勘探不斷取得進(jìn)展,鉆探開發(fā)出大量新的出油井點,由此獲取的豐富資料為深入研究延長組長3提供可能,由此認(rèn)識到長3不僅是中生界主要的生油層,同時也是良好的儲層,具有形成有利自生自儲式油藏的條件,其深水區(qū)存在的濁積巖作為石油儲層,打破了深水區(qū)為油氣勘探禁區(qū)的觀念。采用標(biāo)志層-基準(zhǔn)面旋回轉(zhuǎn)換點綜合分層法,在長3小層精細(xì)劃分對比的基礎(chǔ)上分析該區(qū)構(gòu)造特征,研究表明該區(qū)發(fā)育的構(gòu)造對油氣控制作用不明顯。通過巖石類型、重礦物的特征、古河流方向并且結(jié)合前人的研究成果,認(rèn)為長3儲層的物源主要來自東北-西南部。同時在物源分析的基礎(chǔ)上對研究區(qū)長3時期沉積體系進(jìn)行了系統(tǒng)的研究,認(rèn)為長3儲層是曲流河三角洲沉積,有長33到長31歷史時期,三角洲面積逐漸減小,長31、長32、長33廣泛形成濁積巖,形成良好的儲層。在研究區(qū),應(yīng)用區(qū)內(nèi)鑄體薄片、電鏡掃描等各種分析測試資料發(fā)現(xiàn),儲層巖性以細(xì)粒長石砂巖為主,孔隙類型以粒間孔為主,總體上物性差,為特低孔低滲儲層,同時對比該地區(qū)孔隙度與滲透率的變化趨勢,可知孔隙度與滲透率具有較好的相關(guān)性。儲層宏觀和微觀非均質(zhì)性都較強,夾層頻率由長31到長33依次減小,平面圖上以塊狀局部地區(qū)分布。同時建立了研究區(qū)的儲層“四性關(guān)系”,對研究區(qū)的孔隙度、滲透率及含油飽和度進(jìn)行了重新認(rèn)識。進(jìn)而進(jìn)行儲層評價,將儲層劃分為五個等級,為之后的有利目標(biāo)區(qū)優(yōu)選提供依據(jù)。另外沉積環(huán)境及成巖作用是影響儲層物性的主要因素,廣泛發(fā)育的裂縫為油氣運移提供了良好的通道。研究認(rèn)為,物性較好的濁積水道砂體是油氣聚集的有利場所。同時,長3濁積巖緊鄰三角洲中心,具有良好的生、儲、蓋組合,在濁積水道微相砂體厚度大,結(jié)合生產(chǎn)、試油資料以及儲層綜合評價等方法優(yōu)選出多個有利目標(biāo)區(qū),并提出下一步油氣勘探的方向。
[Abstract]:The Ordos Basin is one of the earliest basins in China, and it is also the second largest oil-gas basin in China. With the development of the petroleum exploration in Erdos basin, a large number of new well points have been developed, and the abundant information obtained is provided by the extended group leader 3 in-depth study, and it is recognized that the long 3 is not only the main oil-bearing oil layer but also a good reservoir. The present invention has the condition of forming an advantageous self-storage reservoir, and the turbidite existing in the deep water zone is used as the petroleum reservoir, and the concept of the oil and gas exploration restricted zone in the deep water zone is broken. The structure characteristics of this area are analyzed on the basis of the fine division and comparison of the long 3 small layers by means of the combination of the mark layer and the reference plane cyclic conversion point. The results show that the structure of this area is not obvious to the control of oil and gas. By the rock type, the characteristics of the heavy minerals, the direction of the ancient rivers and the research results of the predecessors, it is considered that the source of the long 3 reservoir is mainly from the northeast and the south-west. At the same time, on the basis of the analysis of the material source, the study on the system of the three-period deposition system of the study area is carried out, and it is considered that the long 3 reservoir is the meandering river delta deposit, with a length of 33 to 31 years, the delta area is gradually reduced, and the long 31, the long 32 and the long 33 form the turbidite, To form a good reservoir. In the study area, various analysis and test data such as cast-body sheet and electron microscope scanning in the application area have been found. The reservoir lithology is dominated by fine-grained feldspar sandstone, and the pore type is dominated by intergranular pores, and the overall physical property is poor, which is a low-porosity and low-permeability reservoir. It is found that porosity and permeability have a good correlation with the change trend of porosity and permeability in the area. The macro-and micro-heterogeneity of the reservoir is strong, the frequency of the interlayer is reduced from 31 to 33 in sequence, and the plan is distributed in a block-shaped local area. At the same time, the reservoir "four-sex relationship" of the study area is established, and the porosity, permeability and oil saturation of the study area are re-recognized. Furthermore, the reservoir evaluation is carried out, and the reservoir is divided into five grades, and the favorable target area after the reservoir evaluation is preferably provided. In addition, the sedimentary environment and diagenesis are the main factors that affect the physical property of the reservoir, and the widely developed fracture provides a good channel for the migration of oil and gas. The study is that the turbidite channel sand body with better physical properties is a favorable place for oil and gas accumulation. At the same time, the long 3 turbidite is close to the center of the delta, and has a good combination of raw, reservoir and cover. In the method, a plurality of favorable target areas are preferably developed in the method of large thickness of the micro-phase sand body of the turbidite channel, combined with production, test oil data and comprehensive reservoir evaluation, and the direction of the next step of oil and gas exploration is proposed.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 王建民;鄂爾多斯盆地南部中生界長3油層油氣分布特征及油藏類型分析[J];礦物巖石;2000年04期

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本文編號：2435684