Formation of mid-deep strata with high radioactivity in the Tahe oil field and its application
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摘要: 塔河地区中深层是指中—下奥陶统内幕探明储量区计算油层底界附近的辅助层T751面到鹰山组T78面之间的层系，相当于地层划分的鹰上段下亚段和鹰下段。T751地震、测井追踪比较困难，通过大量统计发现，塔河中深层碳酸盐岩地层中普遍存在三套高放射性层段，而这些高放射性地层可能是很好的油气储层，因此在中深层储层评价中，自然伽马能谱测井是评价高放射性储层的一种有效技术手段，高放射性地层不仅可以作为区域地层对比的标志层，而且对于裂缝发育带和早期岩溶作用以及后期油气充注路径有很好的指示。Abstract: The mid-deep strata in the Tahe area cover the range from T751 to T78, that is, from the lower part of the upper Yingshan Formation to the lower Yingshan Formation from stratigraphic aspect. It is relatively difficult to track T751 with seismic and logging methods. Through a large number of statistic findings, three highly radioactive intervals were commonly found in the mid-deep formation in the Tahe oil field, with possible good reservoirs. Thus during the evaluation of mid-deep reservoirs, Natural Gamma Ray Spectrometry Logs is an effective technique to evaluate highly radioactive reservoirs. Highly radioactive formations not only can be a key horizon for regional formation comparison, but also a good indicator for fault belt, karstification and the path of oil and gas charging.
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Key words:
- high radioactivity /
- Yingshan Formation /
- reservoir evaluation /
- Tahe oil field
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