页岩气“双甜点”参数测井评价方法
Logging evaluation of “double sweet spot” in shale gas reservoirs
- 2022年43卷第4期 页码:1005-1012
收稿:2022-01-05,
修回:2022-05-01,
纸质出版:2022-08-01
DOI: 10.11743/ogg20220420
移动端阅览
收稿:2022-01-05,
修回:2022-05-01,
纸质出版:2022-08-01
移动端阅览
页岩气储层的地质与工程“双甜点”评价常困于3点:① 含气饱和度计算精度低,定量评价方法还不成熟;② 可压裂性评价方法虽多,但操作困难,局限性大;③地质与工程评价弱关联,一体化融合不充分。针对上述难点,开展了3方面探索:① 根据含气原理,基于测井曲线与含气敏感关系的次序重构,建立了表征地质“甜点”的含气丰度曲线;② 根据脆性指数、岩石力学参数及地应力差异系数与压裂的相关性,提出表征工程“甜点”的综合可压指数;③ 根据生产数据,基于测试层产能分级,建立了表征地质-工程一体化的评价图版。本研究提高了页岩气层的定性判别和可压性评价精度,地质-工程一体化评价图版能准确区分高、中、低产气层及干层,并被生产测试及产出剖面所验证。实践表明,该技术在四川盆地及其周缘深、浅层具有良好通用性和可靠性,推广应用前景广阔。
Evaluation of “double sweet spot” in shale gas reservoirs, i.e. shale gas sweet spot that are both geologically and engineeringly feasible, is challenging due to insufficient accuracy of gas saturation calculation, limitations of fracability assessment methods (though quite a few), and inadequate integration between the geological and engineering assessments. In view of these, a gas abundance curve representing the geological “sweet spot” is established to tackle the accuracy problem through a sequential reconstruction of the sensitivity relationship between logging curves and gas bearing property based on gas bearing principles. A comprehensive fracability index representing the engineering “sweet spot” is developed to enhance the usability of the fracability assessment methods based on the correlation of rock brittleness index, mechanic parameters and in-situ stress difference coefficients to fracturing. And a geology-engineering evaluation chart is also proposed to better integrate the two aspects based on the production data and productivity classification of layers tested. This study improves the accuracy of qualitative identification and fracability assessment of shale gas sweet spots. The chart has been proven to be effective in recognizing high- medium- and low-potential gas pay zones as well as dry layers. Practices show that the technology is applicable and reliable in assessing shallow/deep layers in the Sichuan Basin and its periphery.
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