【作者】 袁娜；

【导师】 薛海涛； 梁秀丽；

【作者基本信息】 东北石油大学 ， 地质工程， 2012， 硕士

【摘要】 萨北开发区过渡带位于大庆长垣萨尔图背斜构造的东北部，构造趋势西南高东北低，发育的萨、葡油层属同一水动力系统，断层较少。随着油层埋藏逐渐加深，过渡带地区的一条带到四条带，葡II组、葡I组、萨III组、萨II组油层逐渐进入油水同层，砂岩、有效厚度逐渐减小。该区块于1989年投入开发，采用斜线性注水井网，边缘井均为采出井，目前已进入特高含水开发阶段，措施挖潜难度和储量接替压力越来越大，同时由于多年注水开发，过渡带四条带外边缘油水分布发生改变，现有的地质认识已不能满足油田开发的需要。本论文的研究思路是以萨北开发区构造背景为基础，综合分析和合理利用地质资料、测井资料、地震剖面，建立一套真实可信的储层地震地质层位模型，划分地层层序，并利用地震属性和蚂蚁体追踪技术对工区内构造和微幅构造进行精细解释，分析微幅构造和小断层对油水分布的影响；在层序单元划分和界面特征研究的基础上，通过密井网控制下的小层——微相对比剖面，研究沉积微相和砂体的几何形态和分布规律；利用地层切片和地震属性分析技术，按照“单井—剖面—平面”的顺序，勾画出砂体的平面分布范围，利用密井网测井资料对砂体进行精细解剖，研究砂体的接触关系及连通状况。在以上研究基础上，分析萨北开发区过渡带地区的成藏条件和油水分布情况，为油田后期开发调整提供技术依据。论文经过研究取得以下主要成果：1、通过大量的分析研究，在区域性湖泛面、三级层序界面、体系域界面、四级层序界面的约束下，建立了研究区高精度的等时对比格架，识别出萨零组油层9个五级层序构造界面。2、通过井-震结合进行了精细构造研究，编制了四级、五级层序界面构造图，揭示了研究区的构造、微幅构造特征。指出研究区位于由北转向东倾的转折带翼部，为一地层变陡带，形成向北东方向凸出的微幅鼻状构造。3、应用各种属性、蚂蚁体算法，追踪了小断层，揭示小断裂的分布规律。研究区的小断层大部分在常规方法下不易识别，发育较少，多呈北西向展布。这些断层可形成小型的断背斜构造，对成藏具有一定的影响。4、通过大量单井、连井高精度层序格架和沉积相分析，识别出河流三角洲和浊积体系，划分了分流河道、水下分流河道、河口坝、前缘席状砂坝、远端坝、决口水道和决口三角洲、浊积水道、席状浊积扇朵（上叠扇）等沉积微相类型，揭示了各小层沉积相的平面分布和演化。应用地震属性及反演等方法开展了浊积沉积相和砂分散体系的研究，对过渡带的浊积储层发育模式和分布规律进行深入探讨并进行了预测，揭示了浊积体系的沉积微相和砂体的分布规律。5、通过对该区成藏条件和有利相带的研究，基本阐明了油水界面的分布特征，并提出和预测了潜在的构造-地层圈闭的分布，认为过渡带应发育有砂岩上倾尖灭和砂岩油气藏。更多还原

【Abstract】 Sabei transition area is situated in northeast of Saertu arch structure of Daqing oilfieldand structural surface is tend to be higher in the southwest and lower in the northeast. The oillayer, Sertu and Putaohua, belong to the same hydrodynamic system and faults are lessdeveloped in this area. As reservoir depth increases, oil layers in Portuguese I group, II group,Sa III group and II group turn into oil-water layers gradually with decreases in sandstone andeffective thickness. This block is put into development in1989, using slash injection wellpattern with edge wells as production wells. Now the block is entered into ultra-high water cutdevelopment stage, difficulty in potential tapping and reserve replacement increases gradually.At the same time, years of water flooding development has caused changes in oil-waterdistribution of outer edges of the fourth belt in transition area, thus the existing geologicalunderstanding is not competent for oilfield development.The research is based on the tectonic background of Sabei development area, usingcomprehensive analysis and rational utilization of geological data, well logging data andseismic profile to establish a set of credible reservoir seismic-geology horizon model, carryout stratigraphic division; proceed fine interpretation on region structure and micro-structureusing seismic attributes and ant tracking technology; analyze the influences of micro-structureand small faults on oil-water distribution; based on sequence division and interfacecharacteristics, carry out researches on sedimentary microfacies and sand body geometry anddistribution through sublayer-microfacies contrast profiles under the dense well patterncontrol; block out sand body distribution range in plane by using formation sections andseismic attributes analysis technology in accordance with the sequence of " singlewell-section-plane "; take fine interpretation of sand body, including contact relation andconnectivity status by using dense well pattern logging data. Based on above study, reservoirformation conditions and oil-water distribution in transition zones of Sabei development areais analyzed and the achievements can provide technical basis for later oilfield developmentand adjustment.Main achievements of the research:1. Established high-precision isochronous correlation framework of study area andidentified9tectonic interfaces of the fifth-order sequence of Saling reservoir under therestraints of regional flooding surface, third-sequence surface, system domain surface,fourth-order and fifth-order sequence surfaces. 2. Carried out fine construction through well-seismic correlation, generalized interfacestructure map of fourth-order and fifth-order sequence, revealed structure and micro-structurecharacteristics of study area. Recognized the study area is located in the wing of transitionzone, which bended from north to east. The transition zone is a layer of steep belt with aconfiguration of micro-nosing structure protruding to northeast.3. Proceed small faults tracking and revealed their distribution characteristics by usingvarious attributes and ant algorithm. These small fractures are less developed, mostly innorth-west direction and difficult to identify in conventional methods. These faults can formsmall faulted anticline, which has certain effects on reservoir formation.4. Identified river delta system and turbidite system, divided sedimentary microfaciessuch as distributary channel, underwater distributary channel, mouth bar, frontal sheet sanddam, dam, distal crevasse channel and crevasse delta, turbidite channels, mat form turbiditefan flower (superimposed fan), revealed sedimentary facies distribution in plane and evolutionin each layer. With the application of seismic attributes and inversion, turbidite sedimentaryfacies and sand body distribution system has been studied, carried out in-depth study andprediction on development mode and distribution rules of turbidite reservoir in transition area,and described distribution characteristics of sedimentary microfacies and sand body in theturbidite system.5. Clarified oil-water interfaces distribution through study on reservoir conditions andprofitable facies, and predicted potential structural-stratigraphic trap distribution. It isconsidered that sandstone up dip pitchout and sandstone reservoirs are developed in thetransition area.更多还原