本文選題：哈南地區(qū) + 阿爾善組三段�。� 參考：《西南石油大學》2017年碩士論文

【摘要】：二連盆地位于中國內(nèi)蒙古自治區(qū)的中北部,是我國陸上大型沉積盆地之一。哈南地區(qū)位于二連盆地阿南凹陷東部的阿爾善構造帶,阿爾善組油藏是哈南地區(qū)主力油藏之一,但是近幾年的勘探效果不理想。通過大量前人理論研究,認為哈南地區(qū)阿爾善組發(fā)育近岸水下扇沉積。近岸水下扇是斷陷湖盆陡坡帶較為典型的沉積體系,在我國東部地區(qū)取得了大量的油氣勘探突破,是重要的油氣儲集體。本論文的研究對近岸水下扇沉積體系研究具有較好的理論意義,對哈南地區(qū)進一步預測儲層分布和老油田的挖潛、增儲上產(chǎn)具有重要的實際意義。本文以哈南地區(qū)阿爾善組三段為研究對象,大量分析前人研究成果,在區(qū)域構造研究及地層研究的基礎上,開展研究區(qū)地層對比及沉積物源分析,通過沉積相標志研究,總結阿爾善組三段各沉積微相特征,分析沉積相的演化及分布規(guī)律,分析阿爾善組三段的沉積模式,得到以下結論:哈南地區(qū)位于內(nèi)蒙古二連盆地阿南凹陷內(nèi)。阿爾善組是哈南地區(qū)主力油藏之一。阿三段為典型的砂礫巖體沉積,地層發(fā)育受古隆起、潛山及斷層控制明顯,整體表現(xiàn)為“北厚南薄”,在善南洼槽和哈東洼槽哈局部地層厚度可達200m以上,哈南潛山和東部莎音烏蘇凸起有地層缺失。通過研究區(qū)內(nèi)成分成熟度、巖屑組分含量的變化情況及巖性分析認為,存在北部、東部和南部三個物源方向;結合碎屑顆粒結構分析以為,北部的蒙古林凸起和東部的莎音烏蘇凸起可能是主要物源區(qū),南部的蘇尼特隆起可能是次要物源區(qū)。哈南地區(qū)阿三段為近岸水下扇-湖泊沉積,近岸水下扇劃分為扇根、扇中和扇端亞相,扇根分為主水道和主水道間微相,扇中又分為辮狀水道、辮狀水道間和扇中前緣三個微相。近岸水下扇體主要發(fā)育在阿三段底部,向上扇體發(fā)育變差,逐漸演變?yōu)楹闯练e;扇體發(fā)育及沉積相帶展布,受湖泊邊緣斷裂凸起、潛山及洼槽控制明顯。湖盆邊緣斷裂、凸起邊緣發(fā)育扇根亞相,潛山附近發(fā)育扇中亞相,洼槽區(qū)域多為扇端及湖泊沉積。研究區(qū)東部莎音烏蘇凸起近岸水下扇發(fā)育較好,南部阿南斜坡發(fā)育一般,向哈南潛山-善南洼槽和哈東洼槽,逐漸過渡為湖泊沉積。近岸水下扇多發(fā)育在斷陷盆地中,以重力流、近源沉積為主要特征。盆地伸展應力作用下,形成斷陷湖盆,是近岸水下扇發(fā)育的構造環(huán)境。斷陷湖盆中,同生斷層形成的陡坡帶是近岸水下扇發(fā)育需要的古地貌條件。湖盆邊緣的古凸起,為扇體的發(fā)育提供了必備的沉積物質。盆地構造持續(xù)活躍、均勻沉降的湖侵時期,有利有大型水下扇體的發(fā)育。湖盆斷裂邊緣、潛山、洼槽等微地貌,控制了扇體內(nèi)部亞相(扇根、扇中、扇端)的發(fā)育和分布。扇根的主水道和扇中的辮狀河道砂礫巖體,是重要的油氣儲集體。
[Abstract]:Erlian basin is located in the north-central part of Inner Mongolia Autonomous region of China and is one of the large sedimentary basins on land in China. The Haman area is located in the Arshan structural belt in the eastern part of Anan depression in Erlian Basin. The Alshan formation reservoir is one of the main reservoirs in the Hannan area, but the exploration results in recent years are not satisfactory. Based on a large number of previous theoretical studies, it is considered that the Alshan formation developed nearshore subaqueous fan deposits. The near-shore underwater fan is a typical sedimentary system in the steep slope zone of the faulted lake basin. It has made a great deal of oil and gas exploration breakthroughs in the eastern part of China and is an important oil and gas reservoir. The research in this paper is of great theoretical significance to the study of near-shore underwater fan sedimentary system, and has important practical significance for further prediction of reservoir distribution, tapping potential of old oil fields and increasing reservoir and production in Hannan area. In this paper, taking the third member of the Alshan formation in the Haman area as the research object, a large number of previous research results are analyzed. On the basis of the regional structural research and stratigraphic research, the stratigraphic correlation and sediment source analysis are carried out in the study area, and the sedimentary facies markers are studied. The characteristics of each sedimentary microfacies of the third member of the Alshan formation are summarized, the evolution and distribution of the sedimentary facies are analyzed, and the sedimentary model of the third member of the Alshan formation is analyzed. The conclusions are as follows: the Haman area is located in the Anan sag of Erlian Basin, Inner Mongolia. Alshan formation is one of the main reservoirs in Hanan area. The third member is a typical sandy and gravelly rock mass, the strata are developed by paleouplift, the buried hill and fault are controlled obviously, and the whole is "thick in the north and thin in the south". The thickness of the local strata in Shannanwa trough and Hadongwa trough can be more than 200 m. Hanan buried hill and the eastern Shayin Usu uplift have a lack of strata. Based on the analysis of composition maturity, variation of cuttings content and lithology in the study area, it is concluded that there are three sources in the north, east and south, combining with the analysis of clastic grain structure, The Mongolia forest uplift in the north and the Shayinusu uplift in the east may be the main provenances, and the Sunita uplift in the south may be the secondary provenance. The A3 member of the Hanan area is a near-shore subaqueous fan-lake deposit, and the nearshore underwater fan is divided into fan roots, fan and fan end subfacies, the fan root is divided into the microfacies between the main waterway and the main watercourse, and the fan is divided into braided channels. There are three microfacies between the braided waterways and the front edge of the middle fan. The subaqueous fan body mainly developed at the bottom of the A3 member, and the upper fan body became worse and gradually evolved into lacustrine deposit, and the fan body development and sedimentary facies distribution were obviously controlled by the lacustrine edge fault protruding, buried hill and depression trough. The lacustrine margin is faulted, the uplift margin develops fan root subfacies, and the subfacies of fan near buried hill is developed. The depression area is mostly fan end and lacustrine deposit. In the eastern part of the study area, the nearshore subaqueous fan of the Shayinwusu uplift is well developed, and the southern Anan slope is generally developed, which is gradually transitioned to lacustrine deposit from the Hannan buried hill to the Shananwa trough and the Hadongwa trough. Offshore subaqueous fans are mostly developed in faulted basins, characterized by gravity flow and near-source deposition. The faulted lacustrine basin was formed under the action of extensional stress in the basin, which is the tectonic environment for the development of subaqueous fan in the nearshore. The steep slope zone formed by syngenic faults is the paleogeomorphic condition needed for the development of subaqueous fans in the near shore in the faulted lacustrine basin. The paleoprotuberance at the edge of the lake basin provides the necessary sedimentary material for the development of the fan body. The active and uniform subsidence of the basin during the period of lake transgression is favorable for the development of large underwater fan bodies. The development and distribution of subfacies (fan root, fan in fan and fan end) are controlled by microgeomorphology of lacustrine fault margin, buried hill, depression trough and so on. The main channel of fan root and the braided channel sandy gravel rock in fan are important oil and gas reservoirs.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.13

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