滨里海盆地东缘中石炭统台内滩分布预测及甄别: 以北特鲁瓦斜坡区为例

滨里海盆地东缘中石炭统KT-Ⅱ油组广泛发育开阔台地相的台内滩，台地内沉积环境开阔且稳定，地势平坦，台内滩往往呈孤立状漂浮在台地内的微地貌高地，故其分布规律难以预测。钻探实践表明，台内滩相是后期发生建设性成岩改造作用的基础，亦是形成优质储层的主控因素，对其分布进行预测至关重要。为了提高滩体预测准确率，立足于区域沉积演化分析，并逐步开展三维地震属性分析及高分辨率反演，充分结合地震资料的预测性和地质认识的规律性，通过总结相带地质规律对地震储层预测进行补充和甄别，做到地质和地球物理认识上的统一。研究结果表明，地震属性趋势控制下的统计学反演可以较准确地刻画小层级别的薄层滩体空间分布特征。结合沉积规律对预测滩体进行了筛选和分类，其中一类滩体7个，二类滩体4个，三类滩体3个，一类、二类滩体已有钻井证实，符合沉积规律，三类滩体与地质认识相悖，予以筛除。研究成果建立了该区隐蔽型滩体预测的完整技术体系，而且已见到实效，目前针对一类滩体的钻探成功率高达100%。 

Prediction and discrimination of the Middle Carboniferous inner platform shoal distribution at the eastern margin of Pre-Caspian Basin: Taking the North Truwa slope area as an example

The Middle Carboniferous KT-Ⅱoil formation in the eastern margin of the Pre-Caspian Basin is widely developed with open platform facies intra platform beach.The sedimentary environment is open and stable, and the terrain is flat.The intra platform beach often floats in isolated micro geomorphic Highlands in the platform, so its distribution is often difficult to predict.Drilling practice shows that the beach facies in the platform is the basis of constructive diagenesis in the later stage, and it is also the main controlling factor for the formation of high-quality reservoir, so it is very important to predict its distribution.In order to improve the accuracy of beach prediction, based on the analysis of regional sedimentary evolution, and gradually carry out three-dimensional seismic attribute analysis and high-resolution inversion, fully combined with the predictability of seismic data and the regularity of geological knowledge, through summing up the geological law of facies belt, the seismic reservoir prediction is supplemented and screened, so as to achieve the unity of geological and geophysical knowledge.The results show that the statistical inversion under the control of seismic attribute trend can accurately describe the spatial distribution characteristics of thin beach body at the level of small layer.According to the sedimentary law, the predicted beach bodies are screened and classified.Among them, there are 7 first-class beach bodies, 4 second-class beach bodies and 3 third-class beach bodies.The first- and second- class beach bodies have been confirmed by drilling, which are consistent with the sedimentary law.The third-class beach bodies are contrary to the geological understanding and should be screened out.The research results have established a complete technical system for the prediction of concealed beach bodies in this area, and have seen actual results.At present, the success rate of drilling for a class of beach bodies is as high as 100%.