海相页岩储层水岩作用及其对开发效果的 影响研究进展
Research progress on water-rock interactions of marine shale reservoir and its influence on development effect
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- 引用格式:
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穆英,胡志明,邹才能.海相页岩储层水岩作用及其对开发效果的 影响研究进展[J].天然气与石油,2023,41(3):64-73.doi:10.3969/j.issn.1006-5539.2023.03.010
MU Ying, HU Zhiming, ZOU Caineng.Research progress on water-rock interactions of marine shale reservoir and its influence on development effect[J].Natural Gas and Oil,2023,41(3):64-73.doi:10.3969/j.issn.1006-5539.2023.03.010
- DOI:
- 10.3969/j.issn.1006-5539.2023.03.010
- 作者:
- 穆英1,2,3 胡志明1 邹才能1
MU Ying1,2,3, HU Zhiming1, ZOU Caineng1
- 作者单位:
- 1. 中国石油勘探开发研究院, 北京 100083; 2. 中国科学院大学, 北京 100049; 3. 中国科学院渗流流体力学研究所, 河北 廊坊 065007
1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China; 2. University of Chinese Academy of Sciences, Beijing, 100049, China; 3. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei, 065007, China
- 关键词:
- 海相页岩;水岩作用;储层特征;竞争吸附;气水两相流动;开发效果
Marine shale; Water-rock interactions; Reservoir characteristics; Competitive adsorption; Gas-water two-phase flow; Development effect
- 摘要:
水平钻井、水力压裂过程中伴随工作液滞留,水岩作用改变海相页岩储层特征与页岩气井开发效果,明确水岩作用机理及其对页岩气赋存和运移的影响,是指导页岩气生产开发的基础。现有研究表明,矿物组成、孔隙结构、流体性质和彼此之间的相互作用是影响页岩吸水的主要因素,水分子侵占孔隙表面的甲烷吸附位,引发气水置换作用,提高孔隙流体压力并降低储层含气性。水岩作用导致矿物膨胀、脱落,储层力学特征和物性参数改变,产生大量次生孔缝,这些次生改造为流体运移提供了更多的渗流通道,改善了储层的渗流能力,但是孔隙水和矿物颗粒堵塞部分孔缝,导致储层气相渗透率降低。针对现有研究认识与不足,建议对以下方面开展进一步研究:1)精细划分并定量分析页岩孔隙中的水;2)明确气水竞争吸附机理及其对页岩含气性的影响;3)分析水岩作用对页岩孔缝特征与矿物组分的影响;4)探究水岩作用对储层含水特征及开发效果的影响规律。
During horizontal drilling and hydraulic fracturing, with the retention of working fluid, water-rock interactions change the characteristics of marine shale reservoirs and the development effect of shale gas wells. Clarifying the mechanism of water-rock interactions and its influence on the occurrence and migration of shale gas is the basis for guiding shale gas production and development. Existing studies have shown that mineral composition, pore structure, fluid properties, and their interactions are the major factors affecting shale water absorption. Water molecules occupy methane adsorption sites on pore surface, leading to gas-water replacement effect, increasing pore fluid pressure and reducing reservoir gas content. Water-rock interactions lead to mineral expansion and shedding, changes in reservoir mechanical characteristics and physical parameters, and produce numerous secondary pores and fractures. These secondary transformations provided more percolation channels for fluid migration and improved the percolation capacity of the reservoir, but pore water and mineral particles blocked some pores and fractures, resulting in lower gas permeability of the reservoir. In view of the existing research understanding and shortcomings, it is suggested to carry out further research in the following aspects:1) Perform fine division and quantitative analysis of water in shale pores; 2) Clarify the mechanism of gas-water competitive adsorption and its influence on shale gas content; 3) Analyze the influence of water-rock interaction on the pore-fracture characteristics and mineral composition of shale; 4) Explore the influence of water-rock interaction on reservoir water-bearing characteristics and development effects.
