發(fā)布時(shí)間：2018-02-08 20:09

  本文關(guān)鍵詞： 硬脆性頁巖 龍馬溪組頁巖 水化作用 自吸吸水率 物理化學(xué)作用 力學(xué)作用　出處：《西南石油大學(xué)學(xué)報(bào)(自然科學(xué)版)》2016年03期 　論文類型：期刊論文

【摘要】：硬脆性頁巖水化對(duì)頁巖氣開發(fā)井壁穩(wěn)定有重要的影響,為此,對(duì)龍馬溪組硬脆性頁巖進(jìn)行水化實(shí)驗(yàn)研究,包括礦物組成、微觀結(jié)構(gòu)、水化應(yīng)力、自吸吸水率及巖芯浸泡等方面實(shí)驗(yàn)研究,探討分析了硬脆性頁巖水化過程與機(jī)理。研究結(jié)果表明,頁巖黏土礦物以伊利石為主,黏土礦物呈片狀且定向排列,層理和微裂紋發(fā)育,為水化提供作用空間和流動(dòng)通道;頁巖水化應(yīng)力和自吸吸水率隨浸泡時(shí)間增加而先上升后趨于穩(wěn)定,頁巖組構(gòu)對(duì)上升速率或幅度有重要影響;浸泡過程中,巖樣表面主要形成平行層里面的裂縫,隨著浸泡時(shí)間增加,巖樣保持完整性或水化剝落成碎塊,頁巖組構(gòu)和膠結(jié)程度對(duì)頁巖水化程度有重要影響;頁巖水化是物理化學(xué)作用和力學(xué)作用相互耦合結(jié)果,前者使巖石斷裂韌性下降,后者使Ⅰ型裂紋應(yīng)力強(qiáng)度因子增大,當(dāng)應(yīng)力強(qiáng)度因子大于巖石斷裂韌性時(shí),裂紋將擴(kuò)展或增寬,逐漸形成宏觀裂紋,可進(jìn)一步擴(kuò)展成裂縫。
[Abstract]:The hydration of hard brittle shale has an important effect on the stability of shale gas development wellbore. Therefore, the hydration experiments of hard brittle shale in Longmaxi formation are carried out, including mineral composition, microstructure, hydration stress, etc. In this paper, the hydration process and mechanism of hard brittle shale are discussed and analyzed. The results show that the shale clay is dominated by Illite, and the clay mineral is in the form of sheet and directional arrangement. Bedding and microcrack development provide space and flow channel for hydration, hydration stress and self-suction water absorption of shale increase first and then stabilize with the increase of soaking time, shale fabric has an important effect on the rising rate or amplitude. The fracture in parallel layer is mainly formed on the surface of rock sample. With the increase of soaking time, the rock sample remains intact or hydrated and spalling to pieces, and shale fabric and cementation degree have important influence on shale hydration degree. Shale hydration is the coupling result of physicochemical action and mechanical action. The former makes the fracture toughness of rock decrease, while the latter makes the stress intensity factor of mode I crack increase. When the stress intensity factor is larger than the fracture toughness of rock, the crack will expand or widen. A macroscopic crack is gradually formed, which can be further expanded into a crack.
【作者單位】： "油氣藏地質(zhì)及開發(fā)工程"國(guó)家重點(diǎn)實(shí)驗(yàn)室·西南石油大學(xué);西南石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金聯(lián)合基金重點(diǎn)項(xiàng)目(U1262209);國(guó)家自然科學(xué)基金(51274172)
【分類號(hào)】：TE21

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