高渗透砂岩储层时变特征的数值模拟:以高迁南部地区为例

IF 1.2 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Geofluids Pub Date : 2024-04-01 DOI:10.1155/2024/4886286
Hui Xu, Guofeng Cheng, Nannan Liu, Lizhi Wang, Zhenghuai Guo, Xiang Wang, Xiangji Dou, Juan Li, Shangping Chen, Xing Shi
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引用次数: 0

摘要

在平均孔隙度为 30%、平均渗透率为 μm2 的高前南部地区长期水淹过程中,油、水、岩石之间的流固作用对孔隙结构产生了很大影响。它导致储层参数随着时间的延长而发生变化。本文采用电子显微镜扫描、注汞、X 射线衍射、物理性质和油水相对渗透率曲线等方法,研究了高压水淹后高渗透砂岩的粘土矿物含量、孔喉结构、孔隙度、渗透率和相对渗透率曲线的变化。结果表明,蒙脱石、高岭石等粘土矿物在长期水浸后发生溶解、水化和迁移,导致细砂岩和中砂岩中粘土矿物含量降低,孔喉半径增大,位移压力、中位压力和分离系数降低。油水相对渗透率曲线饱和等渗点明显右移,亲水性明显增强,孔隙度和渗透率得到有效改善,但细砂岩中存在小于 2 μm 的孔喉堵塞现象。此外,本文还建立了注水量、渗透率、不可还原水饱和度、剩余油饱和度、油水相对渗透率曲线系数方程,并结合水淹前的油井数据建立了初始渗透率模型。采用水淹过程中开发井的测井解释结果作为验证数据,渗透率相对误差远低于一般要求的渗透率误差在一个数量级内小于 30%,验证了该方法的合理性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Simulation of Time-Varying Characteristics in a High-Permeability Sandstone Reservoir: A Case of Gaoqian Southern Area

In the process of long-term water flooding in the Gaoqian Southern Area with an average porosity of 30% and an average permeability of 1333.5 × 10−3μm2, the fluid-solid interaction among oil, water, and rock has a great influence on the pore structure. It has resulted in changes in reservoir parameters with the extension of time. This paper used electron microscopy scanning, mercury injection, X-ray diffraction, physical properties, and oil-water relative permeability curves to study the variation of clay mineral content, pore throat structure, porosity, permeability, and relative permeability curves of high-permeability sandstone after high-pressure water flooding. The results showed that clay minerals such as montmorillonite and kaolinite were dissolved, hydrated, and migrated after long-term water flooding, which resulted in the decrease of clay mineral content in fine sandstone and medium sandstone, the increase of pore throat radius, and the decrease of displacement pressure, median pressure, and separation coefficient. The saturation of the isotonic point of the oil-water relative permeability curve was obviously shifted to the right, the hydrophilicity was significantly enhanced, and the porosity and permeability were effectively improved, but there was a blockage of the throat less than 2 μm in the fine sandstone. In addition, this paper established the equations of water injection, permeability, irreducible water saturation, residual oil saturation, and oil-water relative permeability curve coefficient and establishes the initial permeability model with the well data before water flooding. The logging interpretation results of development wells in the process of water flooding as verification data were used, and the relative error of permeability far lower than the general requirement of permeability error within an order of magnitude was less than 30%, which verified the rationality of the method.

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来源期刊
Geofluids
Geofluids 地学-地球化学与地球物理
CiteScore
2.80
自引率
17.60%
发文量
835
期刊介绍: Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.
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