基于应力-应变曲线形态的致密气储层脆性研究

doi:10.3969/j.issn.1673-8926.2017.03.015

岩性油气藏 ›› 2017, Vol. 29 ›› Issue (3): 126–131.doi: 10.3969/j.issn.1673-8926.2017.03.015

基于应力-应变曲线形态的致密气储层脆性研究

张杰¹, 张超谟^1,2, 张占松^1,2, 张冲^1,2, 聂昕^1,2

1. 长江大学地球物理与石油资源学院, 武汉 430100;
2. 长江大学油气资源与勘探技术教育部重点实验室, 湖北荆州 434023

收稿日期:2016-12-13 修回日期:2017-02-09 出版日期:2017-05-21 发布日期:2017-05-21
第一作者:张杰(1992-),男,长江大学在读硕士研究生,研究方向为地球物理测井综合解释。地址:(430100)湖北省武汉市蔡甸区大学路特一号长江大学武汉校区。Email:iamshuimuchanggong@163.com。
基金资助:
国家杰出青年科学基金项目“致密气储层岩石导电机理研究及饱和度评价”（编号：41404084）和湖北省自然科学青年基金项目“基于等效岩石单元模型的渗透率测井评价方法研究”（编号：2013CFB396）联合资助

Brittleness of tight gas reservoirs based on stress-strain curves

ZHANG Jie¹, ZHANG Chaomo^1,2, ZHANG Zhansong^1,2, ZHANG Chong^1,2, NIE Xin^1,2

1. Geophysics and Oil Resource Institute, Yangtze University, Wuhan 430100, China;
2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Jingzhou 434023, Hubei, China

Received:2016-12-13 Revised:2017-02-09 Online:2017-05-21 Published:2017-05-21

摘要/Abstract

摘要： 岩石的脆性研究对致密气的勘探开发具有重要意义。储层岩石脆性越高，压裂后裂缝越发育，产能越高。以鄂尔多斯盆地东北部二叠系致密气储层为研究对象，通过研究脆性岩石的单轴压裂起裂机制，以单轴压裂曲线的起裂点和峰值点的应力与应变为基础，结合多种脆性计算公式，建立了新的脆性指数计算模型。研究表明：利用新模型计算的脆性指数与基于静态岩石力学参数计算的脆性指数具有很明显的函数关系，可以有效表征研究区岩石的脆性；基于单轴抗压实验的压裂效果，利用新建立的脆性指数和初裂点指数可以有效地建立储层的压裂效果划分标准。该研究成果丰富了储层脆性计算的方法，建立了新的脆性评价标准。

关键词: 岩石物理相-流动单元, 特低渗透油藏, 优质储层, 测井响应特征, 定量评价

Abstract: The brittleness of rocks is one of the most important parameters in tight gas exploration and development. The higher the reservoir rock brittleness is, the more fracturing fracture develops, and the higher the production capacity will be. A variety of brittleness calculation formulas were used to establish a new calculation model of brittleness index of the Permian tight gas reservoir in northeastern Ordos Basin by researching the uniaxial compression crack mechanism of brittle rock, and the stress and strain of the first crack point and the peak under uniaxial compression. The results show that the brittleness index calculated by the new model can characterize the brittleness of the rocks effectively, because it has obvious function relationship with the brittleness calculated by static rock mechanics parameters in the experiments. Based on the fracturing effect in uniaxial compressive experiments, the new brittleness index and the initial crack point index could be used to establish the standard of reservoir fracturing effect. This result enriches the reservoir brittleness calculation method, and sets a new standard of brittleness evaluation.

Key words: petrophysical facies-flow unit, ultra-low permeability reservoir, high quality reservoirs, logging response characteristics, quantitative evaluation

中图分类号:

TU45

张杰, 张超谟, 张占松, 张冲, 聂昕. 基于应力-应变曲线形态的致密气储层脆性研究[J]. 岩性油气藏, 2017, 29(3): 126–131.

ZHANG Jie, ZHANG Chaomo, ZHANG Zhansong, ZHANG Chong, NIE Xin. Brittleness of tight gas reservoirs based on stress-strain curves[J]. Lithologic Reservoirs, 2017, 29(3): 126–131.

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基于应力-应变曲线形态的致密气储层脆性研究

Brittleness of tight gas reservoirs based on stress-strain curves

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