准噶尔盆地西北缘乌尔禾—夏子街地区侏罗系沉积相演化
发布时间：2018-08-04 13:53
【摘要】：侏罗系是准噶尔盆地油气勘探的主力层系之一,现已探明的以构造油气藏为主的乌夏地区油气勘探面积达2000km2。前人已对该地区进行了地质构造、地层层序、沉积相等方面的研究,但对储层岩石学特征和沉积学特征的研究不够系统,对沉积微相的精细研究较少。本文在前人研究的基础上,综合运用地震、钻井、测井、分析化验等资料,对乌夏地区侏罗系地层划分、物源方向、沉积特征、沉积相纵横向展布等进行系统性的研究,取得了以下成果和认识:①综合储层岩石组分、成分成熟度、结构成熟度、重矿物分布特征、地层厚度、砂砾岩厚度等特征对研究区目的层的物源方向进行分析,结果表明,该区侏罗系各组的物源具有良好的继承性,主要有两个方向的物源,一是研究区北部的哈拉阿拉特山,二是北东方向的和什特洛盖地区。②对研究区的岩性特征、沉积构造、粒度特征以及电性特征因素进行了分析,确定了各沉积相的相标志,做出了单井沉积相图。③结合区内单井沉积相图,确定该区侏罗系的沉积体系为冲积扇-辫状河-辫状河三角洲体系,其中:八道湾组发育河道、心滩、泛滥平原和辫状分支河道、陆上天然堤、沼泽微相;三工河组和西山窑组均发育河道、心滩、泛滥平原和辫状分支河道;头屯河组发育发育河道、泛滥平原和辫状分支河道;齐古组地层部分被剥蚀,发育辫状河(河道充填、心滩、泛滥平原)。④在湖盆演化背景下,编制了研究区侏罗系沉积相纵剖面图以及各小层的沉积相平面图,分析得出侏罗系沉积相演化规律:八道湾组沉积时期,盆地总体以发育辫状河-辫状河三角洲沉积为特征,气候潮湿,形成含煤的粗碎屑沉积。三工河组沉积初期,由于受西北缘扎伊尔山地层抬升影响,研究区主要发育辫状河河道亚相,沉积中后期,盆地经历了大规模的湖侵,凹陷中心以三角洲沉积为主,扎伊尔山物源形成巨大的辫状河三角洲沉积。西山窑组沉积时期,盆地西部整体隆升导致沉积缺失,靠近扎伊尔山一侧辫状河分布较广,湖泊范围仅分布于盆地凹陷中心;研究区山前向凹陷中心过渡地带仍然依托扎伊尔山的物源形成巨大的辫状河三角洲沉积,当时气候温湿,形成大面积的泛滥沼泽、滨湖沼泽、河流沼泽环境,成为煤层发育的极盛时期。头屯河组沉积时期,山前以辫状河沉积为特征,凹陷中心湖盆逐渐缩小,研究区内大面积沉积三角洲平原。齐古组沉积时期,盆地构造活动比较活跃,地层快速剥蚀、快速沉积,岩性以红色(暗红)沉积为主,气候干热;以发育辫状河相为特征,地层被大量剥蚀,地震剖面上显示为削蚀接触关系。
[Abstract]:Jurassic is one of the main strata of oil and gas exploration in Junggar Basin. Previous studies on the geological structure, stratigraphic sequence and sedimentary equivalence have been carried out in this area, but the petrological and sedimentary characteristics of the reservoir are not systematically studied, and the fine study of sedimentary microfacies is less. On the basis of previous studies, this paper makes a systematic study of Jurassic stratigraphic division, provenance direction, sedimentary characteristics, longitudinal and horizontal distribution of sedimentary facies in Wuxia area by synthetically using seismic, drilling, logging, analysis and laboratory data. Obtained the following results and understanding of the reservoir rock composition, composition maturity, structural maturity, heavy mineral distribution characteristics, formation thickness, sand gravel thickness and other characteristics of the target layer of the study area material source direction analysis, the results show that, The source of Jurassic groups in this area has good inheritance, and there are mainly two directions of provenance, one is the Arrate Mountain in the north of the study area, the other is the lithologic characteristics and sedimentary structure of the study area in the north-east direction and in the Stelokei area. The grain size characteristics and electrical characteristic factors are analyzed, the facies marks of each sedimentary facies are determined, and the single well sedimentary facies diagram .3 is made in combination with the single well sedimentary facies diagram in the area. The sedimentary system of Jurassic in this area is the alluvial fan-braided river delta system, in which the Badaowan formation has developed river channels, Xintan, flood plains and braided branch rivers, natural levees on land and marsh microfacies; The channel, Xintan, flood plain and braided branch channel are developed in Sangonghe formation and Xishanyao formation; the river channel, flood plain and braided branch channel are developed in Toutunhe formation; the strata in Qigu formation are partly denuded and braided river is developed. (4) in the background of lake basin evolution, the longitudinal profile of Jurassic sedimentary facies and the sedimentary facies plan of each layer in the study area were compiled, and the evolution law of Jurassic sedimentary facies was obtained: the sedimentary period of Badaowan formation, The basin is characterized by braided river-braided river delta deposits with humid climate and coarse clastic deposits containing coal. In the early sedimentary period of the Sangonghe formation, the braided river subfacies were mainly developed in the study area due to the uplift of the Zairian mountain strata in the northwestern margin. The basin experienced large-scale lake transgression in the middle and late stage of the sedimentary period, and the center of the depression was mainly delta sedimentation. The Zairian mountain source forms a huge braided river delta deposit. During the sedimentary period of Xishanyao formation, the whole uplift of the western part of the basin resulted in the lack of sediment, and the braided river near the side of the Zaire mountain was widely distributed, and the lake area was only distributed in the center of the basin depression. The transition zone from the front of the mountain to the center of the depression in the study area still relies on the provenance of the Zairian Mountains to form a huge braided river delta deposit. At that time, the climate was warm and humid, forming a large area of flood swamps, lakeside swamps, and river swamp environments. Become the peak period of coal seam development. In the sedimentary period of the Toutunhe formation, the braided river deposits are the characteristics in the front of the mountains, and the lake basin in the center of the depression gradually shrinks, and a large area of sedimentary delta plain is studied in the study area. During the sedimentary period of Qigu formation, the basin was active in tectonic activity, rapid denudation and rapid deposition of strata, the lithology of which was dominated by red (dark red) deposits, and the climate was dry and hot, characterized by the development of braided river facies, and the massive denudation of the strata. The seismic profile shows an erosion contact relationship.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P534.52
本文编号：2164091
[Abstract]:Jurassic is one of the main strata of oil and gas exploration in Junggar Basin. Previous studies on the geological structure, stratigraphic sequence and sedimentary equivalence have been carried out in this area, but the petrological and sedimentary characteristics of the reservoir are not systematically studied, and the fine study of sedimentary microfacies is less. On the basis of previous studies, this paper makes a systematic study of Jurassic stratigraphic division, provenance direction, sedimentary characteristics, longitudinal and horizontal distribution of sedimentary facies in Wuxia area by synthetically using seismic, drilling, logging, analysis and laboratory data. Obtained the following results and understanding of the reservoir rock composition, composition maturity, structural maturity, heavy mineral distribution characteristics, formation thickness, sand gravel thickness and other characteristics of the target layer of the study area material source direction analysis, the results show that, The source of Jurassic groups in this area has good inheritance, and there are mainly two directions of provenance, one is the Arrate Mountain in the north of the study area, the other is the lithologic characteristics and sedimentary structure of the study area in the north-east direction and in the Stelokei area. The grain size characteristics and electrical characteristic factors are analyzed, the facies marks of each sedimentary facies are determined, and the single well sedimentary facies diagram .3 is made in combination with the single well sedimentary facies diagram in the area. The sedimentary system of Jurassic in this area is the alluvial fan-braided river delta system, in which the Badaowan formation has developed river channels, Xintan, flood plains and braided branch rivers, natural levees on land and marsh microfacies; The channel, Xintan, flood plain and braided branch channel are developed in Sangonghe formation and Xishanyao formation; the river channel, flood plain and braided branch channel are developed in Toutunhe formation; the strata in Qigu formation are partly denuded and braided river is developed. (4) in the background of lake basin evolution, the longitudinal profile of Jurassic sedimentary facies and the sedimentary facies plan of each layer in the study area were compiled, and the evolution law of Jurassic sedimentary facies was obtained: the sedimentary period of Badaowan formation, The basin is characterized by braided river-braided river delta deposits with humid climate and coarse clastic deposits containing coal. In the early sedimentary period of the Sangonghe formation, the braided river subfacies were mainly developed in the study area due to the uplift of the Zairian mountain strata in the northwestern margin. The basin experienced large-scale lake transgression in the middle and late stage of the sedimentary period, and the center of the depression was mainly delta sedimentation. The Zairian mountain source forms a huge braided river delta deposit. During the sedimentary period of Xishanyao formation, the whole uplift of the western part of the basin resulted in the lack of sediment, and the braided river near the side of the Zaire mountain was widely distributed, and the lake area was only distributed in the center of the basin depression. The transition zone from the front of the mountain to the center of the depression in the study area still relies on the provenance of the Zairian Mountains to form a huge braided river delta deposit. At that time, the climate was warm and humid, forming a large area of flood swamps, lakeside swamps, and river swamp environments. Become the peak period of coal seam development. In the sedimentary period of the Toutunhe formation, the braided river deposits are the characteristics in the front of the mountains, and the lake basin in the center of the depression gradually shrinks, and a large area of sedimentary delta plain is studied in the study area. During the sedimentary period of Qigu formation, the basin was active in tectonic activity, rapid denudation and rapid deposition of strata, the lithology of which was dominated by red (dark red) deposits, and the climate was dry and hot, characterized by the development of braided river facies, and the massive denudation of the strata. The seismic profile shows an erosion contact relationship.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P534.52
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