多尺度多场应力耦合致密砂岩体积改造裂缝评价模型研究

项目名称： 多尺度多场应力耦合致密砂岩体积改造裂缝评价模型研究

项目编号： No.51504042

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 肖阳

作者单位： 成都理工大学

项目金额： 21万元

中文摘要： 致密砂岩储层体积改造，生产压裂过程中热流固耦合的应力扰动和孔隙裂缝空间的多尺度性，决定了致密砂岩储层裂缝的复杂性和多样性，如何正确识别和预测压后裂缝形态及复杂程度，对于压后分析和产能预测显得尤为重要。本课题在针对压裂的地应力场拟合基础上，建立更真实的地质力学模型，综合考虑多级裂缝动态起裂作用，建立热流固耦合应力场模型，对压裂施工曲线进行精细分析和解释，运用停泵压力注入\降压分析和G函数特征研究，对比微地震解释成果识别改造后裂缝形态和复杂程度，最后综合地质力学模型等效剖面和施工工艺参数，建立起多尺度多场应力耦合的复杂裂缝评价模型，为致密砂岩储层的高效开发提供理论支撑。

中文关键词： 致密砂岩储层；体积改造；多尺度；多场应力耦合；裂缝评价模型

英文摘要： Due to the stress disturbance which caused by thermal-hydraulic-mechanical (THM) coupling in hydraulic fracturing and multi-scale of pore and fracture, fractures in SRV tight sandstone would be complex and diversity. The methods of identify and predict fracture geometry is of great significance for post-fracture analysis and production forecasting. Real geological mechanical model would be set up based on the in-situ stress field fitting, and thermal-hydraulic-mechanical (THM) coupling in-situ stress field would be established considering multistage dynamic fracture splitting. Analyzing and interpreting of fracturing operation curve by studying pump pressure injection \ step-down and G function characteristic. Identifying geometry and complexity of fractures by comparing the micro seismic interpretation results. Finally, a multi-scale stress coupled multi-field complex fracture evaluation model would be established by combining geological mechanics model with construction technology parameters, which to provide theoretical support for the efficient development of tight sandstone reservoir.

英文关键词： tight sandstone reservoir;SRV;multi-scale;multi- field stress coupling; fracture evaluation model