超临界二氧化碳与页岩相互作用机制

doi:10.11743/ogg20240420

Abstract

Abstract:

Understanding the mechanism and pattern of interactions between supercritical carbon dioxide （SC-CO₂） and shale is crucial to the exploitation of shale oil and gas. However， there is a lack of studies on the changes in shale wettability， porosity， and permeability after SC-CO₂ injection into shale reservoirs. In this study， the changes of mineral composition and microstructures of shales are quantitatively characterized before and after SC-CO₂ soaking under different soaking time， pressure and fluid type， while taking the shales in the Longmaxi area in the Sichuan Basin. Analyses and tests of the total organic carbon （TOC） content， mineral composition， surface morphology， and low-pressure N₂ and CO₂ adsorption of shales are conducted， and the impacts of SC-CO₂ on shale porosity， permeability， and wettability are explored. The results indicate that an increase in the soaking time and pressure leads to a decrease in the contents of clay and carbonate minerals （i.e.， calcite and dolomite）， while an increase in the quartz content results in a significant decrease in the organic matter content in shales. The scanning electron microscopy （SEM） images reveal that the changes in the microscopic pore structures of shales are jointly affected by extraction， dissolution， and adsorption-induced swelling and， on the other hand， further alter shale porosity and permeability. Additionally， the variation in shale permeability is influenced by the contents of clay minerals， carbonate minerals， and organic matter. The shale wettability also changes after soaking in SC-CO₂. Specifically， as the soaking time and pressure increase， the shale-water contact angle enlarges， with the shale transitioning from strong hydrophilic to weak and moderate hydrophilic type.

Key words: dissolution, extraction, permeability, wettability, supercritical carbon dioxide （SC-CO₂）, shale, Sichuan Basin

CLC Number:

TE122.2

Yibo LI, Yaowang CHEN, Jinzhou ZHAO, Zhiqiang WANG, Bing WEI, Kadet Valeriy. Interaction mechanism between supercritical carbon dioxide and shale[J]. Oil & Gas Geology, 2024, 45(4): 1180-1194.

Figures/Tables 21

Table 1

Table 2

Requirements for the specifications of core samples used in experiments"

岩样规格	测试内容	制样要求
颗粒	总有机碳含量（TOC）	100～120目
	矿物成分	200目
	微观孔隙结构	40～60目
$ϕ$ 25 mm×3 mm圆柱片	表面形貌、润湿性	两端平整光滑，无掉落粉末
$ϕ$ 25 mm×30 mm圆柱体	孔隙度、渗透率	两端平整光滑，无裂纹

Table 2

Table 3

Fig.1

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Fig. 18

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矿物组分含量/%						TOC/%	孔隙度/%	渗透率/（10^-3 μm²）
黏土矿物	石英	方解石	白云石	斜长石	黄铁矿	TOC/%	孔隙度/%	渗透率/（10^-3 μm²）
17.9	31.8	31.7	12.1	3.1	3.4	4.53	0.53	6.82×10^-4

实验分组	实验条件
实验分组	温度/℃	压力/MPa	时间/d	水
压力组	40	8，16，20，24	7	无
时间组	40	16	7，14，21，28	无
水分组	40	16	7	有

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Interaction mechanism between supercritical carbon dioxide and shale

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