四川盆地涪陵地区页岩裂缝测井定量识别

发布时间：2018-10-09 13:13

【摘要】：页岩气资源作为自生自储的非常规能源,页岩储层天然裂缝的发育情况不仅影响自身含气性,更对后期压裂改造效果有着直接影响。以四川盆地涪陵页岩气田五峰组—龙马溪组页岩储层宏观裂缝为主要研究对象,首先在探井岩心资料和电成像测井资料基础上,总结归纳了研究区页岩裂缝常规测井曲线响应特征,优选出能较好评价页岩储层裂缝的多种常规测井参数;然后通过分析电成像测井提供的裂缝信息,构建页岩裂缝定量计算模型;运用概率神经网络法,将探井的页岩裂缝定量计算结果与优选出的常规测井信息进行拟合,将拟合结果程序化,实现页岩裂缝的测井定量识别。通过探井页岩裂缝识别结果与该井电成像测井计算结果对比分析,认为该方法能较准确识别研究区页岩裂缝发育情况。研究区水平井页岩裂缝定量识别结果与页岩储层含气性和压裂施工参数的相关性研究,说明该方法能较好地评价页岩储层的含气性以及预测后期压裂改造效果。该研究对中国南方海相页岩气资源的进一步高效勘探开发有一定的参考意义。
[Abstract]:The development of natural fractures in shale reservoir not only affects the gas content of shale reservoir, but also has a direct impact on the effect of later fracturing reconstruction. Taking the macroscopic fractures of the shale reservoir of Wufeng formation and Longmaxi formation in Fuling Shale Gas Field in Sichuan Basin as the main research object, firstly, based on the core data of exploration wells and the data of electrical imaging logging, The response characteristics of conventional logging curves for shale fractures in the study area are summarized, and a variety of conventional logging parameters that can be used to evaluate shale reservoir fractures are selected, and the fracture information provided by electrical imaging logging is analyzed. The quantitative calculation model of shale fractures is constructed, and the quantitative calculation results of shale fractures in exploration wells are fitted with the selected conventional logging information by using probabilistic neural network method, and the fitting results are programmed to realize the logging quantitative identification of shale fractures. By comparing and analyzing the results of shale fracture identification and electrical imaging logging, it is concluded that this method can accurately identify the shale fracture development in the study area. The correlation between the quantitative recognition results of shale fractures in horizontal wells and the gas content of shale reservoirs and the parameters of fracturing operation shows that this method can better evaluate the gas-bearing characteristics of shale reservoirs and predict the effect of later fracturing reconstruction. This study has some reference significance for the exploration and development of marine shale gas resources in southern China.
【作者单位】：中国石化重庆涪陵页岩气勘探开发有限公司;
【基金】：国家科技重大专项“涪陵页岩气开发示范工程”(2016ZX05060)
【分类号】：P618.13;P631.81

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