摘要:
渤海油田近些年来在中深层储层的勘探开发中发现了一定数量的低阻油层,不少此类油层经试油证实有较高的产能,一些油田低阻油层所占储量比重达到了60%以上,为提高低阻层的识别效果,迫切需要对低阻油层的成因和识别方法进行总结。在总结其他油田类似储层评价经验的基础上,以测井、录井、岩心实验分析及DST测试等资料为依据,分析了渤海地区常见低阻油层的测井响应特征及对应的识别方法。研究结果表明:孔隙结构复杂、高矿化度泥浆侵入、地层水矿化度变化等是形成渤海地区中深层低阻油层的主要原因,采用常规测井技术、录井技术和核磁共振、阵列声波等技术组合可以较好地进行低阻油层的识别。
关键词:
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渤海油田
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中深层
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低阻油层
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成因
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识别
Abstract:
Many low-resistivity oil reservoirs have been found in the medium-deep buried strata of the Bohai oil field recently. Most of them have high production after DST. In some of them, the reserve of low-resistivity reservoir may be above sixty percent. It is indeed an urgent need to find out the causes and evaluation method for this kind of reservoirs. Upon the evaluation experiences from other fields, we studied in this paper the origin of the low-resistivity oil reservoir in the medium-deep strata, and the methods to identify them from others. The results show that complex pore structure, high salinity water invasion, and change in water salinity are the main causes for the formation of low-resistivity oil reservoirs. The methods, which may effectively identify the low-resistivity oil reservoir, are also discussed, such as the combination of conventional well logging technique, mud logging technique and some new well logging techniques like NMR logging and array acoustic logging. The combination is proven effective.
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