四重介质油藏渗流模型与试井曲线

发布时间：2018-03-27 20:26

本文选题：碳酸盐岩　切入点：大裂缝　出处：《岩性油气藏》2016年01期

【摘要】：在发育缝洞型四重介质的碳酸盐岩油藏中,其大裂缝和微裂缝的渗流机理不同,以往建立的常规多重介质试井模型不能适应四重介质油藏试井解释需求。因此,基于基质、微裂缝、溶蚀孔洞和大裂缝组成的四重介质,建立物理和数学模型,并利用Laplace变换、Stehfest数值反演等方法进行求解,得到实空间解,进而绘制试井曲线。分析表明:四重介质油藏压力导数曲线的过渡段将出现3个"凹子",其深浅以及出现时间的早晚受弹性储容比和窜流系数的共同影响;弹性储容比影响"凹子"的宽度和深度,窜流系数影响"凹子"出现的时间,同时对"凹子"的深度和宽度也有一定的影响;决定四重介质油藏试井曲线特征的参数较多,曲线对参数的变化比较灵敏;含有微裂缝和大裂缝的缝洞型碳酸盐岩油藏,更适合用四重介质试井模型进行解释。
[Abstract]:The percolation mechanism of large fractures and microfractures in carbonate reservoirs with fracture-cavity type quadruple media is different, so the conventional multi-medium well test model established in the past can not meet the needs of well test interpretation in quadruple medium reservoirs. The physical and mathematical models are established in a quadruple medium composed of microcracks, dissolved holes and large fractures. The real space solutions are obtained by using the Laplace transform Stehfest numerical inversion method. The analysis shows that there will be three recesses in the transition section of the pressure derivative curve of the quadruple medium reservoir, and the depth and the occurrence time will be affected by the elastic storage capacity ratio and the channeling coefficient. The elastic storage volume ratio affects the width and depth of the concave, the channeling coefficient affects the time of the occurrence of the concave, at the same time, the depth and width of the concave are also affected to a certain extent, and the parameters determining the characteristics of the well test curve are many. The curves are sensitive to the variation of parameters, and the fractured and large fracture carbonate reservoirs are more suitable for interpretation with the well test model of quadruple medium.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;中国石油大庆油田有限责任公司试油试采分公司地质大队;
【基金】：国家自然科学青年基金项目“缝洞型碳酸盐岩多段压裂水平井压力动态研究”(编号:51304164) 高等学校博士学科点专项科研基金新教师类资助课题“页岩气多段压裂水平井缝网渗流井底压力动态研究”(编号:20135121120001)联合资助
【分类号】：TE312

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