基于八叉树的储层改造体积计算方法及工程应用

doi:10.13722/j.cnki.jrme.2018.1067

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摘要传统的采用规则几何体计算储层改造体积(SRV)往往具有较大误差。为此，提出一种基于八叉树的SRV计算方法，该方法可根据事件点密度生成不规则树状网格化结构，通过提取网格结构中的非空节点的体积来计算压裂改造的SRV。通过蒙特卡罗模拟计算和昆北油田的18口井的应用发现：该方法得到的不规则结构能够较好地包络事件点，有效去除未响应区域带来的计算误差；该方法根据事件点密度进行网格划分，充分考虑了事件点密度对SRV的影响，结果更符合工程认识。实例应用表明，对于较大规模的微地震数据，该方法具较高的计算效率，算得的SRV和油井改造后产液量变化趋势基本一致。相比较传统方法，该方法可为水力压裂施工提供更为可靠的评价指标。

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关键词 ：石油工程, 八叉树, 储层改造体积, 微地震监测, 水力压裂

Abstract：There exists a large error in conventional stimulated reservoir volume (SRV) calculation method which adopts relatively regular shapes to build 3D envelop. An integrated methodology that utilizes the octree method to generate irregular tree mesh structure according to the density of microseismic events was presented，in which the stimulated reservoir volume is obtained by summing up the volumes of non-empty nodes in the tree structure. The method was validated by analog events generated by Monte Carlo simulation and application of eighteen wells of Kunbei oilfield. It was found that the octree method can be used to envelop the event cloud perfectly and eliminate effectively enough the error of unresponsive zones during microseismic monitoring. The octree method fully considers the impact of event density on SRV calculation in different monitoring areas and determines hierarchies of tree structure according to local event density. Hence，the calculation result conforms to engineering knowledge. Engineering applications show that the method has a high computational efficiency for large scale microseismic data，and that the calculated SRVs are consisted with the daily liquid production of 18 wells in Kunbei oilfield. Compared with the conventional approach，the developed method provides a more reliable quantitative index for hydraulic fracturing evaluation.

Key words： petroleum engineering octree method stimulated reservoir volume(SRV) microseismic monitoring hydraulic fracturing

引用本文:

刘星1，2，金衍1，2，林伯韬1，2，林长庆3，谢琳3. 基于八叉树的储层改造体积计算方法及工程应用[J]. 岩石力学与工程学报, 2019, 38(5): 948-955.
LIU Xing1，2，JIN Yan1，2，LIN Botao1，2，LIN Changqing3，XIE Lin3. A calculation method of the stimulated reservoir volume based on octree and its engineering application. , 2019, 38(5): 948-955.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1067 或 http://www.rockmech.org/CN/Y2019/V38/I5/948

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