| 长石粒内孔流体充注规律及分形特征:以鄂尔多斯盆地延长组致密砂岩储层为例 |
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| 引用本文： | 杜书恒,师永民,关平.长石粒内孔流体充注规律及分形特征:以鄂尔多斯盆地延长组致密砂岩储层为例[J].地球科学,2019,44(12):4252-4263. |
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| 作者姓名： | 杜书恒 师永民 关平 |
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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 |
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| 摘 要： | 鄂尔多斯盆地延长组致密砂岩储层长石含量较高且脆性破裂发育广泛，目前对该类储层长石粒内孔流体充注规律及分形特征等了解仍然十分匮乏.综合铸体薄片、场发射扫描电镜、图像处理、分形维数计算等手段，提出"粒内充注"概念并对延长组储层长石粒内孔开展了微观充注过程定量模拟，指出长石粒内孔相对于粒间孔的特殊性.从时间上将粒内充注过程划分为前期非稳态充注和后期稳态充注两大阶段，转折点为充注关键时刻.依据充注速率值分布特点，将长石粒内孔某一时刻发生充注的所有空间位置划分为高速充注区、中速充注区、低速充注区三大充注区域，并建立了粒内充注波及系数幂函数变化曲线，厘清了流动轨迹分形维数的物理意义.研究成果可为鄂尔多斯盆地延长组储层油气成藏过程恢复提供较为重要的启示.
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| 关 键 词： | 鄂尔多斯盆地 长石 粒内孔 粒内充注 分形 石油地质 |
| 收稿时间： | 2017-10-16 |
Fluid Filling Rule in Intra-Granular Pores of Feldspar and Fractal Characteristics: A Case Study on Yanchang Formation Tight Sandstone Reservoir in Ordos Basin |
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| Abstract: | The tight sandstone reservoir of Yanchang Formation in Ordos basin has a high content of feldspar and a wide range of brittle fractures. At present, there is still a lack of understanding of the fluid filling rule in intra-granular pores of feldspar and the fractal characteristics. In this study, the concept of "fluid filling in intra-granular pores" of feldspar is proposed by means of casting thin section, field emission scanning electron microscope, image processing and fractal dimension calculation. The micro filling process of feldspar in Yanchang Formation reservoir is simulated quantitatively, and the specialty of the intra-granular pores in feldspar compared with inter-granular pores is pointed out. According to time, the filling process could be divided into two stages, one is unsteady filling in the early stage and the other is steady filling in the later stage. According to the distribution characteristics of filling rate value, all the filling space in the inner-granular pores of feldspar could be divided into three filling areas:high-speed filling area, medium speed filling area and low-speed filling area, and the power function curve of the sweep efficiency is established and the physical significance of the fractal dimension of the flow path is also clarified. The conclusion could provide important enlightenment for the recovery of reservoir forming process of Yanchang Formation in Ordos basin. |
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