利用声波测井估算裂缝型水合物储层水合物饱和度

发布时间：2018-06-20 17:32

本文选题：祁连山冻土区 + 裂缝　；参考：《石油地球物理勘探》2017年05期

【摘要】：水合物饱和度参数的准确计算对水合物资源量的评价至关重要。本文提出利用超声波测井资料与两端元层状介质模型相结合的方法,可有效评价祁连山冻土区钻孔地层的水合物饱和度变化特征,并在典型裂缝型水合物钻孔DKXX-19进行了应用。研究区钻孔地层裂缝内充填水合物体积分数的变化对纵、横波速度影响较大,而裂缝倾角的变化对纵、横波速度影响较小,可将利用两端元层状介质模型正演模拟得到的纵波相速度直接转换为纵波群速度;通过正演模拟识别出5个井段存在水合物;水合物赋存井段地层的水合物饱和度变化范围为14.1%~89.9%,平均值为69.4%,与现场观测结果接近。研究结果可为祁连山冻土区水合物地层测井评价和地震勘探提供理论依据和技术支撑。
[Abstract]:The accurate calculation of hydrate saturation parameters is very important to the evaluation of hydrate resource. In this paper, a method of combining ultrasonic logging data with two end element layered media model is proposed to effectively evaluate the variation characteristics of hydrate saturation of borehole formation in the frozen soil region of Qilian Mountain, and its application in typical fractured hydrate drilling DKXX-19 is also given. The variation of filling hydrate volume fraction in borehole formation has great influence on the longitudinal and shear wave velocities, while the variation of fracture dip angle has little effect on the longitudinal and shear wave velocities. The P-wave phase velocity obtained by the forward modeling of the layered media model with two ends element can be directly converted into the P-wave group velocity, and the hydrate in five well segments can be identified by the forward modeling. The variation range of hydrate saturation in the formation of gas hydrate formation is 14.1and 89.9, and the average value is 69.4, which is close to the field observation results. The results can provide theoretical basis and technical support for hydrate formation logging evaluation and seismic exploration in the frozen soil area of Qilian Mountain.
【作者单位】：东华理工大学放射性地质与勘探技术国防重点学科实验室;中国地质大学(北京)地下信息探测技术与仪器教育部重点实验室;中国地质调查局油气资源调查中心;
【分类号】：P618.13;P631.81

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