Organization
Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Limited, Tianjin 300459, China
摘要
低阻油层的成因和类型复杂多样，测井响应特征难以与水层进行区分，深入分析低阻油层成因并采用有效的方法识别低阻油层具有重要意义。依据岩心与测井资料，从构造作用、沉积环境、成岩机理等宏观方面，以及束缚水饱和度、黏土附加导电性、地层水矿化度等微观方面入手，对形成低阻油层的影响因素进行了全面分析，得出了高束缚水饱和度是导致低阻油层形成的主要原因。将岩心、测井资料、试油试采结果相结合，总结形成了适合油田评价的邻近水层对比法、束缚水饱和度对比法的定量识别模式，以及横向对比法、交会图识别法和辅助识别法的定性识别模式，利用定量和定性评价技术对渤海旅大A油田低阻油层进行识别。研究结果表明，该方法识别精度达到90%以上，并且成功应用于该油田的生产挖潜实践中，新增低阻探明石油地质储量近400×104 m3，对类似油田低阻油层的挖潜具有很好的指导意义。
Abstract
With the complex and various causes and types of low resistivity reservoir, the logging response characteristics are difficult to be distinguished from water layer, therefore, analysis of the causes and the use of effective method to identify low resistivity reservoir are important. Based on core and logging data, factors affecting the formation of low resistivity reservoir are analyzed by tectonic, sedimentary environment, mechanism of rock, irreducible water saturation, additional conductivity of clay, formation water salinity. The conclusion is that the high irreducible water saturation is the main cause of low resistivity reservoir formation. Combined with the core data, logging data and oil test results, the quantitative identification model of adjacent water layer, irreducible water saturation contrast method and the qualitative identification model of transverse contrast, cross-plot recognition, auxiliary identification method are summarized. The quantitative and qualitative evaluation techniques are used to identify low resistivity reservoir in Bohai LD-A Oilfield. The result shows that these methods have high recognition accuracy in the oilfield, increasing nearly 4 million cubic meters of the low resistance proven oil reserves, and are good guides to develop the similar low resistivity reservoirs.
论文详情