Bibliographic Details
| Title: |
海相页岩储层水岩作用及其对开发效果的 影响研究进展. (Chinese) |
| Alternate Title: |
Research progress on water-rock interactions of marine shale reservoir and its influence on development effect. (English) |
| Authors: |
穆英, 胡志明, 邹才能 |
| Source: |
Natural Gas & Oil; 2023, Vol. 41 Issue 3, p64-73, 10p |
| Abstract (English): |
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. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
水平鉆井、水力壓裂過程中伴隨工作液滯留, 水巖作用改變海相頁巖儲層特征與頁巖氣井開發效果, 明確水巖作用機理及其對頁巖氣賦存和運移的影響, 是指導頁巖氣生產開發的基礎. 現有研究表明, 礦物組成、孔隙結構、流體性質和彼此之間的相互作用是影響頁巖吸水的主要因素, 水分子侵占孔隙表面的甲烷吸附位, 引發氣水置換作用, 提高孔隙流體壓力并降低儲層含氣性. 水巖作用導致礦物膨脹、脫落, 儲層力學特征和物性參數改變, 產生大量次生孔縫, 這些次生改造為流體運移提供了更多的滲流通道, 改善了儲層的滲流能力, 但是孔隙水和礦物顆粒堵塞部分孔縫, 導致儲層氣相滲透率降低. 針對現有研究認識與不足, 建議對以下方面開展進一步研究: 1)精細劃分并定量分析頁巖孔隙中的水; 2)明確氣水競爭吸附機理及其對頁巖含氣性的影響; 3)分析水巖作用對頁巖孔縫特征與礦物組分的影響; 4)探究水巖作用對儲層含水特征及開發效果的影響規律. [ABSTRACT FROM AUTHOR] |
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