苏德尔特地区兴安岭油层精细地震解释及储层预测研究

发布时间：2018-08-08 19:11

【摘要】：苏德尔特地区位于贝西和贝中生油洼槽之间,是在布达特地层古隆起的基础上发育的受断裂控制的继承性“凹中隆”构造,具有很大的勘探潜力。现有的成藏认识已不能满足和指导勘探工作,必须充分利用已有资料结合最新动态资料开展精细成藏研究。研究区目的层为侏罗系兴安岭地层,属于断陷期地层,构造复杂。本文以层序地层学为指导,充分结合钻井、测井和地震资料,进行精细地层划分对比,建立地层格架。基于井震结合思想,以合成地震记录为桥梁,采用相干体、三维可视化等技术手段完成苏德尔特地区X0、XI、XII、XIII、XIV、BI顶面六个反射界面的精细层位和断层解释,通过建立高精度空变速度场完成构造图的制作,进行了苏德尔特地区构造特征分析。开展全区曲线敏感性分析,选取对本区储层敏感的测井曲线,根据测井曲线的不同频率尺度能反映不同沉积特征的特点,开展苏德尔特地区拟波阻抗重构反演,完成了重点油层XI和XII储层预测研究,完成了26小层砂岩预测厚度分布图,后验井砂岩预测厚度符合率为76.7%,储层预测效果较好。综合岩心、录井、测井等资料,结合研究区沉积背景和地震反演研究成果,确定该区沉积相类型,建立测井相模式,进行单井相和连井相分析,开展兴安岭重点储层XI和XII各小层沉积相研究,完成26个小层沉积微相特征研究。从烃源岩评价、储层特征、油气运移和油水分布特征等方面,开展了研究区成藏条件研究,总结了研究区的油藏类型和主控因素,确定了研究区兴安岭地层的成藏模式。以构造、反演、沉积和成藏研究成果为基础,根据储层发育特征及油气富集规律,优选出重点有利区,在此基础上,完成目标井位部署。通过对苏德尔特地区的精细地震解释和储层预测研究,取得如下认识:苏德尔特地区兴安岭地层构造形态呈南北分带、东西分块的构造格局,断裂发育密集,构造复杂,主干断裂对油气的运聚具有明显的控制作用。中央隆起区储层最为发育,砂岩具有厚度大、层数多、各层分布差异大的特征。苏德尔特地区兴安岭地层沉积过程中总体上表现为水进特征,油层组内部湖水进退频繁,物源主要来自北部、东部以及南部隆起区,沉积微相类型为水下分流河道、河道间、河口坝、席状砂、前缘席状砂、浊积和湖相沉积。该区成藏主控因素为储层条件、油源断层以及油源断层、局部构造和砂体之间的匹配关系,成藏模式包括油气沿砂体和油源断层近距离运移成藏、沿不整合面侧向运移至油源断层高部位的远距离成藏和多源供烃沿不整合面、砂体及油源断层运聚成藏。
[Abstract]:The Sirte area is located between the Besi and Beizhong oil generating troughs, and is a inherited fault-controlled "depression" structure developed on the basis of the paleouplift of the Bud 茅 te formation, which has great potential for exploration. The existing understanding of reservoir formation can not satisfy and guide exploration work, so it is necessary to make full use of the existing data and combine the latest dynamic data to carry out fine reservoir formation research. The target layer of the study area is the Jurassic Xinganling formation, which belongs to the faulted strata and is complicated in structure. Guided by sequence stratigraphy, this paper combines drilling, logging and seismic data to carry out fine stratigraphic division and correlation and to establish stratigraphic framework. Based on the idea of combining well and earthquake, using synthetic seismogram as bridge, using coherent volume, 3D visualization and other techniques, the fine horizon and fault interpretation of six reflection interfaces on the top surface of X0XINXIIINXIIINXIIIXIVA BI in the Sirte area are completed. The structural characteristics of the Sirte area are analyzed by establishing the high precision velocity field of the spatial variable to complete the construction map. The sensitivity analysis of the whole area curve is carried out, and the logging curves sensitive to the reservoir in this area are selected. According to the characteristics of the different frequency scales of the logging curves, the pseudo wave impedance reconstruction inversion in the Sirte area is carried out according to the characteristics of the different sedimentary characteristics of the logging curves. The prediction of XI and XII reservoirs in key reservoirs has been completed, and the predicted thickness distribution map of 26 small layers sandstone has been completed. The coincidence rate of prediction thickness of post-test sandstone is 76.7, and the reservoir prediction effect is better. Based on the core, logging and logging data, combined with the sedimentary background and seismic inversion results in the study area, the types of sedimentary facies in the study area were determined, the logging facies model was established, and the single well facies and continuous well facies were analyzed. The sedimentary facies of Xi and XII layers in Xinganling key reservoirs were studied, and the sedimentary microfacies characteristics of 26 layers were studied. From the aspects of source rock evaluation, reservoir characteristics, hydrocarbon migration and oil-water distribution, the study of reservoir forming conditions in the study area is carried out, and the reservoir types and main controlling factors in the study area are summarized, and the reservoir forming model of Xinganling formation in the study area is determined. Based on the research results of structure inversion sedimentation and reservoir formation the key favorable areas are selected according to the reservoir development characteristics and the law of oil and gas enrichment. On this basis the target well location deployment is completed. Through the study of fine seismic interpretation and reservoir prediction in the Sirte area, the following conclusions have been obtained: the stratigraphic structure of Xinganling in the Sirte area is divided into the north and the south, the tectonic pattern of the east-west block is divided, the faults are densely developed and the structure is complex. The main fault has obvious controlling effect on oil and gas migration and accumulation. The reservoir in the central uplift area is the most developed, and the sandstone has the characteristics of large thickness, more layers and great difference in distribution of each layer. The sedimentary process of Xinganling formation in the Sirte area is characterized by water flow in general, the lake water in the reservoir group is frequent, and the provenance mainly comes from the northern, eastern and southern uplift areas. The sedimentary microfacies type is subaqueous distributary channel and interchannel, and the sedimentary microfacies are subaqueous distributary channel and interchannel. Estuary dam, sheet sand, front sheet sand, turbidite and lacustrine deposit. The main factors of reservoir formation in this area are reservoir condition, oil source fault and oil source fault, matching relation between local structure and sand body. Long distance accumulation and accumulation of multi-source hydrocarbon supply along unconformity surface, sand body and oil source fault.
【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;P631.4

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