巴音都兰凹陷北洼槽阿尔善组、腾格尔组构造及沉积相研究

发布时间：2018-06-01 04:53

本文选题：巴音都兰凹陷北洼槽 + 构造解释　；参考：《西南石油大学》2015年硕士论文

【摘要】：本论文利用构造地质分析理论、地球物理学并结合沉积学方法,充分利用了测井、录井、岩心和三维地震资料以及油田试油数据等资料,对二连盆地巴音都兰凹陷北洼槽腾格尔组、阿尔善组的构造特征和沉积相进行了研究。研究区地层划分为阿尔善组、腾一下亚段、腾一上亚段和腾二下亚段四个层段。首先利用声波时差测井资料制作合成地震记录进行层位标定,随后采用相干体、水平时间切片等技术,进行三维构造解释。经过时深转换,将各目的层位顶底界面的等T0图转化为深度构造图,并分析了其构造特征。经分析这些断层大致可分为两组：一组是主干断层,其具有发育时间长、断距大、延伸远的特点,此类断层延伸方向多为北偏东；另一组为近东西向延伸的小断层,主要作用是将断阶带或者斜坡进一步复杂化,从而形成一系列的断块、断鼻构造,为油气的聚集提供了有利场所。阿尔善组时期构造活动剧烈,发育多条近南北向大断层,凹陷沿北西向拉张断陷,形成东南断、西北超的单断箕状盆地。到腾一段时期断陷活动有所减弱,表现为断拗型。腾二段时期边界断裂形成的沉降活动明显减弱,凹陷表现为整体沉降的特征,为坳陷型沉积,沉积范围明显扩大,地层厚度横向变化变小。构造格局由北高南低型逐步演变为南高北低型,此时工区南部隆起特征已初见雏形,形成一总体向北倾缓的低幅单斜构造。在沉积相研究中,结合区域地质背景、钻井资料、测井资料、岩心照片和三维地震资料,对巴音都兰凹陷北洼槽的目的层进行沉积相的研究,认为该区主要发育湖泊相、扇三角洲相和近岸水下扇相,并对各类亚相至微相进行了详细的描述。在单井相划分和连井相对比的基础之上,用地震相作为约束条件来确定各类沉积相的展布范围。经分析,阿尔善组东西两侧主要发育扇三角洲；腾一下亚段期由于湖平面的快速上升主要发育滨浅湖相和半深湖相。腾一上亚段湖平面相对下降,物源充足,在陡岸带发育近岸水下扇相,而缓坡带扇三角洲相发育。到腾二下亚段时,湖盆进一步萎缩,扇体逐渐向湖中心进积。利用以上构造和沉积相的研究成果,结合本区的试油资料,从油藏的成藏规律出发,预测有利区带,部署了2口建议井位。
[Abstract]:Based on the theory of tectonic geology analysis, geophysics and sedimentology, this paper makes full use of well logging, core and 3D seismic data and oil field test data. The structural characteristics and sedimentary facies of the Tengger formation and Alshan formation in the northern depression of Bayindolan depression in Erlian Basin were studied. The stratigraphy of the study area is divided into four layers: Arshan formation, Teng Xia submember, Tengyi upper submember and Tengerxia submember. First, synthetic seismic records are made from sonic time difference logging data for horizon calibration, and then three dimensional structural interpretation is carried out by using coherent volume and horizontal time slice techniques. Through time-depth conversion, the iso-T _ 0 map of the top-to-bottom interface of each target layer is transformed into a depth structural map, and its structural characteristics are analyzed. These faults can be roughly divided into two groups: one is the main fault, which has the characteristics of long development time, large fault distance and long extension, the extension direction of these faults is mostly from the north to the east, and the other group is the small fault extending near the east to the west. The main role is to further complicate the fault terrace or slope, thus forming a series of fault blocks, fault nose structure, which provides a favorable place for oil and gas accumulation. During the period of Alshan formation, the tectonic activity was intense, and many faults were formed in the north and south direction, and the depression extended along the NW direction, forming a single faulted dustpan basin with southeast fault and northwest Chao. During the period of Teng period, the activity of fault depression was weakened, showing the type of fault depression. The subsidence activity formed by boundary faults in the period of the second member of Teng formation is obviously weakened, and the depression is characterized by the integral subsidence, which is depression-type deposition, the sedimentary range is obviously expanded, and the lateral variation of stratum thickness becomes smaller. The tectonic pattern evolved from the north high to the south low to the south high and the north low, at this time, the southern uplift of the working area had taken the embryonic form and formed a low-amplitude monoclinal structure with a general northward dip. In the study of sedimentary facies, combined with regional geological background, drilling data, logging data, core photographs and three dimensional seismic data, the sedimentary facies of the northern depression of Bayindolan depression are studied. It is considered that the lacustrine facies are mainly developed in this area. Fan delta facies and nearshore underwater fan facies are described in detail. On the basis of single well facies division and contiguous well correlation seismic facies are used as constraint conditions to determine the distribution range of various sedimentary facies. According to the analysis, fan deltas are mainly developed on the east and west sides of the Alshan formation, and the shallow and semi-deep lacustrine facies are mainly developed in the stage of uplift due to the rapid rise of the lake level. The lake level of the upper segment of Tengyi is relatively lower and the provenance is abundant. The subaqueous fan facies is developed in the steep bank zone and the fan delta facies is developed in the gentle slope zone. The lake basin shrinks further and the fan body gradually accumulates toward the center of the lake. Based on the research results of the above structures and sedimentary facies and combined with the oil test data in this area, the favorable zones are predicted from the reservoir formation law, and two suggested well locations are deployed.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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