| 用“伞式解构”方法剖析致密储层微观各向异性 |
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| 引用本文： | 杜书恒,庞姗,柴光胜,汪贺,师永民.用“伞式解构”方法剖析致密储层微观各向异性[J].地球科学,2020,45(1):276-284. |
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| 作者姓名： | 杜书恒 庞姗 柴光胜 汪贺 师永民 |
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| 作者单位： | 1.中国科学院力学研究所非线性力学国家重点实验室, 北京 100190 |
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| 基金项目： | 国家自然科学基金项目41902132中国科学院油气资源研究重点实验室开放基金项目KLOR2018-6 |
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| 摘 要： | 致密油气储层作为非常规油气储层的重要类型，具有孔隙尺度小，微观非均质性强等显著特征.目前在大幅提高资源动用率方面仍面临重大理论挑战，探索潜力广阔.本研究利用“伞式解构”方法定量解析了中国鄂尔多斯盆地陆相致密砂岩储层孔隙和矿物的微观各向异性特征.实例研究显示，八向伞式切片微观孔喉发育存在显著的微观各向异性，各向填隙物发育特征差异明显，随着取样角度的变化，呈现连续非稳态分布.八向伞式切片分形维数是孔隙率、渗透率和孔喉发育概率的良好表征.研究可为揭示致密储层储渗机理及“甜点”分布规律，指导致密油气有效开发提供重要的理论支撑与实践依据.
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| 关 键 词： | 伞式解构 微观各向异性 致密储层 表征 孔隙 石油地质 |
| 收稿时间： | 2018-10-26 |
Quantitative Analysis on the Microscopic Anisotropy Characteristics of Pore and Mineral in Tight Reservoir by "Umbrella Deconstruction" Method |
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| Abstract: | As an important type of unconventional reservoirs, tight oil and gas reservoirs are characterized by small pore scale and obvious micro-heterogeneity. The exploration potential is vast despite the major theoretical challenges in greatly improving the recovery rate of resources. In this study, the micro anisotropic characteristics of pores and minerals in continental tight sandstone reservoirs in Ordos basin, China, are quantitatively analyzed by means of "umbrella deconstruction". The case study shows that there is a significant micro anisotropy in the micro pore-throat development in eight directions, and the development characteristics of the anisotropic filler are obviously different. With the change of sampling angle, the micro pores show continuously unsteady distribution. The fractal dimension could characterize the porosity, permeability and pore-throat development probability. The study can provide important theoretical support and practical basis for revealing the mechanism of tight reservoir permeability, "sweet spot" distribution and guiding the effective development of tight oil and gas. |
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