孤东油田东营组低阻油层成因分析

孤东油田东营组发育低阻油层 ,因其低阻油层是电阻增大率偏低的一类油层 ,在油层解释工作中经常被遗漏。根据孤东油田东营组油层的低阻成因机制 ,结合不同类型低阻油层的具体特征 ,对造成该区低阻油层的原因进行了分析。结果表明 ,孤东油田油层水矿化度高 ,构造平缓 ,油藏动力小 ,油层含水饱和度偏高 ,多套油水系统以及原油性质存在的差异 ,这些是造成油层低阻的主要原因。同时还认为 ,对低阻油层的解释工作要从成因角度考虑 ,重视薄层和测井曲线特征异常的层段 ,从而开发出低阻油层的潜在储量 ,以保证油区增储上产。

Genetic analysis on low-resistive formation of Dongying Formation in Gudong Oilfield

Low-resistive formation has a small ratio of oil to waterbed. There developed plenty of low-resistive formations in Dongying Formation of Gudong Oilfield. According to the characteristics of the different types of low-resistive formation, the genesis mechanism of the low-resistive formation in Dongying Formation of Gudong Oilfield was analyzed. The results show that the high-salinity formation water is the most important factor to cause low resistivity, and the small structure amplitude, high irritable water saturation, complex oil-water system, different characteristics of crude oil in variable oil-water systems are the other main factors for low resistive reservoirs. In the exploration of low-resistive formation, the thin layer and the layers with abnormal features of the logs should be paid more attention. It is an important way to explore the low-resistive formations for raising the output and reserves of hydrocarbon.