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Geo-seismic characteristics of thin reservoir intervals in West Siberia: interpretation problems and their solutions

机译：西西伯利亚薄层储层的地震特征：解释问题及其解决方案

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The Cretaceous and Jurassic terrigenous section of the West Siberia basin is known from well data to consist of quasi-homogeneous thin layers with thickness ranging from 0.5 to 15 m. Lithologies vary from clays to sands, with many inter-midiate types of rock with different compaction and clay to sand ratios. Reflection coefficients are generally low (less than 0.1), and seismic multiples are not a severe problem. Only high velocity sparse thin (0.5-1.5m) coal beds and dense car-bonized sandstone ad some slight complications to the seismic wave field. Tectonic activity in the region has been very low and most seismic horizons can be treated as quasihorizontal. However, the porosity and permeability characteristics of the layers are very laterally variable. Even in a Cretaceous clinoform complex of Neocomina age and Jurassic faulted continental intervals, the lateral lithology shows more fickleness than the geometry of the layers. The situation is ideal for regional seismic stratigraphic interpretation, but not for the creation of models based on seismic data to improve field development or the identification of small structural/strati-graphic traps that at best are hardly visible on seismic sections. Many of the oil- and gas-saturated intervals of Cretaceous and Jurassic age are beyond seismic resolution, and most of the reflectors seen by interpreters are a result of the interference of numerous reflected waves. The main difficulty of seismic interpretation in the West Siberia region results from an inadequate regard for this thin layering of the geological strata.
机译：西西伯利亚盆地的白垩纪和侏罗纪陆相剖面从井资料中可以看出，它们由厚度在0.5至15 m范围内的准均质薄层组成。岩性从黏土到沙子不等，许多中等类型的岩石具有不同的压实度和黏土比。反射系数通常较低（小于0.1），地震倍数不是一个严重的问题。只有高速稀疏的薄煤层（0.5-1.5m）和致密的碳砂岩才使地震波场略有复杂化。该地区的构造活动非常低，大多数地震层位都可以视为准水平。然而，这些层的孔隙率和渗透率特性在横向上是非常可变的。即使在新近纪时代和侏罗纪断层大陆层的白垩纪倾斜形复合体中，横向岩性也比层的几何形状表现出更多的变浮性。对于区域地震地层解释来说，这种情况是理想的，但对于基于地震数据的模型创建来改善油田开发或识别最多在地震剖面上几乎看不到的小型结构/地层圈闭来说，则不是理想的选择。白垩纪和侏罗纪的许多石油和天然气饱和区间都超出了地震分辨率，解释员看到的大多数反射器都是众多反射波干涉的结果。西西伯利亚地区地震解释的主要困难是由于对地质地层的这种薄层没有足够的重视。

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