贝尔凹陷大磨拐河组沉积相作用及其对油气的控制作用研究

发布时间：2018-01-21 22:02

  本文关键词： 大磨拐河组 沉积相 油气富集 油气控制作用 贝尔凹陷　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以海拉尔盆地贝尔湖坳陷贝尔凹陷大磨拐河组为研究对象,在仔细研读相关文献,并参考已有研究成果的基础上,利用地球物理学、储层地质学、石油地质学、沉积岩石学等相关学科知识理论,通过对所取得的分析化验资料、相关岩心样品观察描述记录和测井资料等的综合分析利用,对研究区地层及目的层段的沉积相类型、砂体展布特征、油气成藏要素、主控因素进行了分析研究,最后在上述工作的基础上综合考虑各种因素分析了沉积相对油气的控制作用。贝尔凹陷大一段沉积期湖泊分布范围广阔,以湖相沉积为主,三角洲沉积范围较小;至大二段沉积期湖泊面积缩小,三角洲沉积发育规模变大。通过综合考虑沉积岩颜色、沉积构造、及测井相标志等沉积相标志,结合单井相及联井相分析认为研究区主要发育三角洲相和湖相两种相类型,曲流河三角洲前缘、前曲流河三角洲、曲流河三角洲平原、滨浅湖、半深湖—深湖五个亚相,河口坝、远砂坝、席状砂、水下分流河道、分流河道、分流间湾、水下分流间湾、重力流、深湖泥、前三角洲泥十个微相。在对沉积微相进行分析的基础上,参考前人研究成果,结合从现场取得的大量数据对该区油气成藏要素及主控因素进行了分析,对油气来源、运移通道、成藏模式等进行了研究。分析认为大磨拐河组油气主要来源于南屯组和大一段地层、储层主要为大二段砂砾岩、伊敏组一段为盖层;油气运移通道主要为不整合面及断裂,生储盖组合为下生上储式;有效烃源岩的分布区控制了油气的分布,油气通过短距离运移在生烃中心附近聚集,而沉积微相通过控制着有利储层的展布对油气的聚集产生影响。不同沉积微相发育不同的沉积物,湖相下发育暗色泥岩因富含有机质在合适的环境下会成为烃源岩层,其孔渗性极低的特性也为其成为有效的盖层提供了可能;三角洲相发育的砂体因其较好的孔渗性而成为油气储集的有利场所,沉积相通过影响烃源岩层和储层的分布控制油气的富集,研究区目的层段油气主要分布在水下分流河道砂体中。
[Abstract]:This paper takes the Damoguahe formation of Beihu depression in Hailaer Basin as the research object. On the basis of carefully studying the relevant documents and referring to the existing research results, geophysics and reservoir geology are used in this paper. Petroleum geology, sedimentary petrology and other related disciplines knowledge theory, through the analysis of the obtained laboratory data, related core sample observation and description records and logging data comprehensive analysis and utilization. The types of sedimentary facies, the distribution characteristics of sand bodies, the oil and gas accumulation elements and the main controlling factors in the stratigraphic and target strata in the study area are analyzed and studied. Finally, on the basis of the above work, the controlling effect of sedimentary relative oil and gas is analyzed synthetically considering various factors. The lake distribution of the large first member of Beier sag is wide, with lacustrine sedimentary as the main factor. The delta sedimentary range is small; The lacustrine area shrinks and the delta depositional scale becomes larger during the depositional period of the second stage. The sedimentary facies marks, such as the color of sedimentary rocks, sedimentary structures, and logging facies markers, are considered synthetically. Combined with single well facies and combined well facies analysis, it is concluded that there are two types of facies in the study area: delta facies and lacustrine facies, meandering river delta front, pre-meandering river delta, meandering river delta plain and shallow shore lake. Half-deep lacustry-deep lake five subfacies, estuarine dam, far sand dam, sheet sand, underwater distributary channel, distributary channel, distributary bay, underwater distributary bay, gravity flow, deep lake mud. Ten microfacies of pre-delta mud. Based on the analysis of sedimentary microfacies and referring to the previous research results, combined with a large number of data obtained from the field, the oil and gas reservoir forming elements and main controlling factors in this area are analyzed. The oil and gas source, migration channel and reservoir forming model are studied. It is considered that the oil and gas of the Damoguahe formation are mainly from Nantun formation and the first member of the first member of the formation, the reservoir is mainly sandstone of the second member, and the first member of the Yimin formation is the caprock. The hydrocarbon migration channel is mainly unconformity surface and fault, and the assemblage of source, reservoir and caprock is lower generation and upper reservoir type. The distribution area of effective source rocks controls the distribution of oil and gas, which accumulates near the center of hydrocarbon generation through short distance migration. Sedimentary microfacies affect hydrocarbon accumulation by controlling the distribution of favorable reservoirs. Different sedimentary microfacies develop different sediments. The dark mudstone developed under the lake facies will become the source rock of hydrocarbon in the suitable environment because of its rich organic matter, and the extremely low porosity and permeability also provide the possibility for it to become an effective caprock. The sand body developed by delta facies is a favorable place for oil and gas reservoir because of its good porosity and permeability. Sedimentary facies control the accumulation of oil and gas by influencing the distribution of source rock and reservoir. The oil and gas of the target formation in the study area are mainly distributed in the underwater distributary channel sand body.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
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本文编号：1452649