薄储层识别与评价在伊拉克H油田的应用

发布时间：2018-04-14 07:01

本文选题：曲线重构 + 地震解释　；参考：《长江大学》2015年硕士论文

【摘要】：薄储层的预测工作一直都是研究的难点,也相应的发展出了多种储层预测的方法和技术。在众多的储层预测方法中,只有找到适合于本工区薄储层预测的方法和关键技术,才能有效地进行储层预测,进而解决岩性油气藏的评价问题。本次使用的关键技术主要有曲线重构技术和地震反演技术。伊拉克H油田目的层内的储层具有厚度较薄,多层系砂体发育和横向变化快的特点,造成了储层的识别和精细预测难度较大。在构造高部位失利的well-7使人们开始意识到本工区的地下地质情况比原先设想的要复杂的多,研究工区亟需借助地球物理手段来对地下的储层进行合理地预测和评价。本论文利用伊拉克H油田高分辨率地震资料,综合应用钻井、地震、测井、化验分析等资料对工区进行了层位解释与精细构造成图、储层预测、各小层砂体厚度及平面沉积相的研究,最终对有利目标进行了勘探部署。采用了如下技术手段进行研究。首先,对工区内采集的测井曲线进行标准化处理,消除采集时间和仪器单位不同所带来的误差,对声波曲线进行曲线重构,提高了声波对岩性的识别能力。其次,由己知的井位数据、地层模型作为约束条件,用稀疏脉冲反演方法生成波阻抗资料,构建了工区合理的阻抗分布趋势。针对常规反演分辨率不能识别砂泥岩薄互层的难题,应用随机模拟、随机反演技术,充分利用测井信息,突破地震频带带宽的限制,达到识别砂泥岩薄互层的目的。在地质统计学反演结果的基础上,建立起了各小层砂体厚度图和平面沉积相图,使我们对地下储层的分布情况有了一个更加直观的认识,也为最终的井位部署工作奠定了坚实的基础。分析认为H油田是一个在长轴背斜构造背景下形成的构造加岩性复合型油藏,储层主要以潮坪环境中的滩-坝为主,岩性为中-细粒砂岩。从砂体的分布情况来看,有利储集砂体主要分布在构造西北部和西南斜坡部位,NA层油藏具有“一砂一藏”的特征,构造高部位和西南斜坡部位的油气富集程度较高,是进行井位部署的有利位置。在构造解释成果的基础上,结合曲线重构技术和地震反演分析方法,预测储集砂体平面分布规律,进而开展沉积相的分析工作,寻找有利储集相带,最终分析本工区油气藏的分布规律,这不失为一种对薄储层的识别与评价比较合适的方法,其成果成为为钻探提供优选目标的有利依据。
[Abstract]:The prediction of thin reservoir is always a difficult point, and many reservoir prediction methods and techniques have been developed accordingly.Among the many reservoir prediction methods, only by finding the method and key technology suitable for the thin reservoir prediction in this area, can the reservoir prediction be carried out effectively and the evaluation problem of lithologic reservoirs be solved.The key techniques used in this paper are curve reconstruction and seismic inversion.The reservoir in the target layer of H oilfield in Iraq has the characteristics of thin thickness, rapid development of multi-layer sand body and rapid lateral change, which makes it difficult to identify and predict the reservoir.Because of the failure of well-7 in the high structural area, people begin to realize that the underground geological conditions in this area are much more complicated than originally thought. The research area needs to use geophysical means to reasonably predict and evaluate the underground reservoir.In this paper, using high-resolution seismic data of H oil field in Iraq, comprehensive application of drilling, seismic, logging, chemical analysis and other data to the work area for layer interpretation and fine structure mapping, reservoir prediction,The thickness and plane sedimentary facies of each small sand body are studied, and the favorable targets are finally explored and deployed.The following technical means are used to carry out the research.Firstly, the logging curves collected in the working area are standardized to eliminate the errors caused by different acquisition time and instrument units, and the acoustic curves are reconstructed to improve the recognition ability of acoustic waves to lithology.Secondly, based on known well location data and formation model as a constraint condition, the sparse pulse inversion method is used to generate wave impedance data, and a reasonable impedance distribution trend in the working area is constructed.In view of the difficult problem that the conventional inversion resolution can not identify the thin interbed of sand and mudstone, stochastic simulation and stochastic inversion technology are used to make full use of logging information to break through the limitation of seismic band bandwidth and to achieve the purpose of identifying thin interbed of sand and mudstone.On the basis of the result of geostatistics inversion, the thickness map and plane sedimentary facies diagram of each sub-layer sand body are established, which makes us have a more intuitive understanding of the distribution of underground reservoir.It also lays a solid foundation for the final well location deployment.It is considered that H oil field is a structural and lithologic complex reservoir formed in the background of long axis anticline. The reservoir mainly consists of beach and dam in tidal flat environment, and the lithology is medium to fine grain sandstone.According to the distribution of sand bodies, the favorable reservoir sand bodies are mainly distributed in the northwestern structure and southwest slope of the reservoir with the characteristics of "one sand and one reservoir", and the oil and gas enrichment degree of the high structural area and the southwest slope is relatively high.Is an advantageous location for well location deployment.On the basis of structural interpretation results, combined with curve reconstruction technique and seismic inversion analysis method, the plane distribution law of reservoir sand body is predicted, and the analysis of sedimentary facies is carried out to find favorable reservoir facies zone.Finally, the distribution of oil and gas reservoirs in this area is analyzed, which is a suitable method for the identification and evaluation of thin reservoirs.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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