【摘要】：從七十年代起,重力流勘探就在勘探領(lǐng)域占有重要的一席之地。但目前我國(guó)對(duì)重力流沉積研究并非非常成熟,很多理論與實(shí)際勘探問(wèn)題仍在工作的進(jìn)行中逐步發(fā)現(xiàn)并完善,基于巖心、測(cè)井、分析化驗(yàn)和地震等資料的綜合分析,結(jié)合國(guó)內(nèi)外深水重力流研究的最新進(jìn)展,本次研究以松遼盆地他拉哈西-英臺(tái)地區(qū)青山口組為主要研究對(duì)象,對(duì)大型坳陷湖盆重力流的沉積特征、識(shí)別標(biāo)志、分布規(guī)律和勘探潛力進(jìn)行了系統(tǒng)研究。本文對(duì)他拉哈西-英臺(tái)地區(qū)青山口組三、四級(jí)層序進(jìn)行了識(shí)別與劃分,主要識(shí)別出沖刷面底部、壩體頂部、泥巖基值轉(zhuǎn)換點(diǎn)、最大湖泛面四種層序界面,并將研究區(qū)域青山口組劃分為3個(gè)長(zhǎng)期旋回和12個(gè)中期旋回,以此基礎(chǔ)上建立了四級(jí)層序地層格架。研究區(qū)青山口組的古底形恢復(fù)得出了青一段到青三段平均坡度為0.2°~0.5°,重力流主要形成并控制于坡折帶。多級(jí)地貌不但控制著重力流的形成并且還控制了重力流的形式,多級(jí)坡折帶易形成子母扇,大型低洼地貌控制疊置扇的形成,斷坑地貌發(fā)育斷坑重力流體,并且多級(jí)地貌形成的重力流形式在地震反射上均有相對(duì)應(yīng)的不同反射特征。文章詳細(xì)對(duì)研究區(qū)主要發(fā)育的四種重力流形式進(jìn)行了沉積特征、識(shí)別標(biāo)志、分布規(guī)律和外部形態(tài)的描述與對(duì)比,其中對(duì)最主體的砂質(zhì)碎屑流做了粒度分析與C-M圖分析,顯示出了其牽引流與重力流特征兼?zhèn)涞亩?地震上將重力流砂體厚度與砂地比、合成記錄對(duì)應(yīng)起來(lái),通過(guò)地震屬性切片分析得出砂地比變化對(duì)地震反射特征的重要影響。重力流砂體由于其搬運(yùn)方式、沉積超壓環(huán)境和有機(jī)酸的溶蝕作用的影響,其儲(chǔ)層物性具有很好的優(yōu)勢(shì),我們對(duì)研究區(qū)的勘探潛力分析發(fā)現(xiàn)圈閉217個(gè),單個(gè)圈閉面積約0.3-15 Km2,總面積達(dá)161.5Km2,勘探潛力十分可觀。文章觀點(diǎn)與研究成果為陸相湖盆深水重力流沉積理論做出一定貢獻(xiàn),并在大慶未來(lái)勘探部署中有一定實(shí)際意義。
[Abstract]:Since the 1970 s, gravity flow exploration has played an important role in the exploration field. However, at present, the study of gravity flow deposition in China is not very mature, and many theoretical and practical exploration problems are still being discovered and perfected step by step, based on the comprehensive analysis of core, logging, analytical laboratory and seismic data, etc. Combined with the latest development of deep water gravity flow research at home and abroad, the Qingshankou formation in Tahashi and Yingtai area of Songliao Basin is taken as the main research object, and the sedimentary characteristics of gravity flow in large depression lake basin are identified. The distribution law and exploration potential are systematically studied. In this paper, the third and fourth order sequences of Qingshankou formation in Tharahas-Yingtai area are identified and divided. The four sequence interfaces are mainly identified: the bottom of scour surface, the top of dam body, the transition point of mudstone base value, the maximum lake pan-surface. The Qingshankou formation is divided into 3 long term cycles and 12 middle cycles, based on which the fourth order stratigraphic framework is established. The average slope of the Qingshankou formation is 0.2 擄~ 0.5 擄, and the gravity flow is mainly formed and controlled in the slope break zone. The multilevel geomorphology not only controls the formation of gravity flow but also controls the form of gravity flow. The multilevel slope break zone is easy to form subparent fan, and the large low-lying geomorphology controls the formation of superimposed fan, and the fault pit geomorphology develops crater gravity fluid. And the gravity flow forms formed by multilevel geomorphology have different reflection characteristics in seismic reflection. The paper describes and compares the sedimentary characteristics, identification marks, distribution rules and external forms of the four main gravity flow forms in the study area. Among them, the grain-size analysis and C-M analysis of the most main sand clastic flow are carried out. It is shown that the characteristics of traction flow and gravity flow are both duality, and that the thickness of gravity flow sand body and the ratio of sand to ground are corresponding to the synthetic records, and the important influence of the change of sand to ground ratio on seismic reflection characteristics is obtained through seismic attribute slice analysis. Due to the influence of its transport mode, sedimentary overpressure environment and dissolution of organic acid, the gravity flow sand body has a good advantage in reservoir properties. We have found 217 traps by analyzing the exploration potential of the study area. The area of a single trap is about 0.3-15 Km2, with a total area of 161.5 km ~ 2, and the potential for exploration is considerable. The views and results of this paper contribute to the theory of deep-water gravity flow deposition in continental lacustrine basin and are of practical significance in the future exploration and deployment of Daqing.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P631.1;P618.13

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