基于模型的波阻抗反演在辽河地区的应用

发布时间：2018-02-10 05:38

本文关键词： 反演建模储层预测　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：二十一世纪以来,随着油气勘探技术不断的发展和创新,油气勘探的难度在逐渐提高,重点目标从构造油气藏等可以容易的发现的油气藏过渡到岩性、薄层等复杂油气藏。地震反演是其中一种很重要的勘探方法和手段、是储层预测的重要方法之一,是地质综合评价与解释的关键组成部分。在辽海滩海西部地区,随着勘探程度的逐步提高,勘探目标日趋势复杂。断陷盆地中砂质含量与纵波阻抗相关性较差,预测效果难以保证。由于受沉积相带控制的影响,砂质含量与纵波阻抗低频趋势则明显不一致,给地震反演建模带来了很多问题。地震反演建模的好坏直接影响最终的地震反演结果,随着埋藏深度的增加,波阻抗值必然增大,当砂泥岩地层深浅部位受压实程度不同时,同一套储层波阻抗值存在差异,因此断陷盆地地震反演建模与常规地震反演建模不同。本文在笔架岭地区拟采用无压实效应的砂岩百分含量进行反演建模,模型直接向反演结果补充砂岩百分含量的低频趋势,并且模型中频信息与纵波阻抗十分相似,保证反演结果正确收敛。最终反演结果可以直接当成砂岩百分含量。该方法应用于该地区后取得了较好的岩性反演效果。反演结果可以很好地与沉积相图,钻井岩性吻合,横向上可以准确地确定砂体分布及边界,纵向上可以区分常规地震剖面难以区分的砂体,对该地区的储层起到了很好的预测作用。区域二位于辽河油田雷家地区,本文以最新的地震数据为基础,通过对其细致的处理和分析,结合相关的钻探资料和数据,从而对有效储层进行了研究。具体的研究思路如下:通过对现有相关资料和数据的研究,从而对该碳酸盐岩的构造特征有了一个初步的了解。然后古地貌对于碳酸盐岩沉积作用的控制进行了研究,在此基础上,结合对地质统计学的使用,对其优质岩性进行了预测。本文还以叠前弹性参数为基准对储层的含油特征、岩石脆性等做出了详细的论证。通过对各向异性分方位角裂缝预测技术,对裂缝的分布状况进行了深入的分析,从而为优质储层识别提供了良好的帮助与支持。
[Abstract]:Since 21th century, with the continuous development and innovation of oil and gas exploration technology, the difficulty of oil and gas exploration has gradually increased. Seismic inversion is one of the most important exploration methods, one of the important methods of reservoir prediction, and a key component of geological comprehensive evaluation and interpretation. With the gradual improvement of exploration degree, the daily trend of exploration target is complicated. The correlation between sand content and P-wave impedance in faulted basin is poor, and the prediction effect is difficult to guarantee. The low frequency trend of sand content and P-wave impedance is obviously inconsistent, which brings a lot of problems to seismic inversion modeling. The quality of seismic inversion modeling directly affects the final seismic inversion results. With the increase of buried depth, the wave impedance is bound to increase. The wave impedance values of the same set of reservoir are different when the depth and shallow part of sand and mudstone strata are subjected to different compaction degrees. Therefore, seismic inversion modeling in faulted basin is different from conventional seismic inversion modeling. In this paper, the uncompacted sandstone percentage content is used for inversion modeling in Bijialing area, and the model directly complements the low frequency trend of sandstone percentage content to inversion results. And the intermediate frequency information of the model is very similar to the P-wave impedance. The inversion results can be regarded as sandstone percent content directly. The inversion results can be well matched with sedimentary facies diagram and drilling lithology after the method is applied in this area. Laterally, the distribution and boundary of sand bodies can be accurately determined, and the sand bodies which are difficult to distinguish between conventional seismic profiles can be distinguished longitudinally, which plays a good role in predicting the reservoir in this area. Region two is located in Lejia area of Liaohe Oilfield. This paper is based on the latest seismic data, through careful processing and analysis, combined with relevant drilling data and data, Thus, the effective reservoir is studied. The specific research ideas are as follows: through the study of existing relevant data and data, Then the paleogeomorphology controlling the sedimentary process of carbonate rock is studied, and on this basis, combined with the use of geostatistics, Based on the prestack elastic parameters, the oil bearing characteristics and rock brittleness of the reservoir are demonstrated in detail. The anisotropic azimuth fracture prediction technique is used to predict the fracture. The distribution of fractures is analyzed in depth, which provides good help and support for high quality reservoir identification.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13;P631.4

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