發(fā)布時(shí)間：2018-04-25 18:25

  本文選題：頁巖氣 + 儲(chǔ)層特征�。� 參考：《地學(xué)前緣》2017年06期

【摘要】：依據(jù)礦物學(xué)、有機(jī)地球化學(xué)、孔隙結(jié)構(gòu)、甲烷吸附性、巖石力學(xué)性質(zhì)、裂縫發(fā)育特征和保存條件等方面的資料,對研究區(qū)下寒武統(tǒng)牛蹄塘組頁巖儲(chǔ)層發(fā)育特征進(jìn)行了系統(tǒng)研究。結(jié)果表明,牛蹄塘組頁巖具有較高的有機(jī)質(zhì)豐度、脆性礦物含量、熱演化程度和甲烷吸附能力。與北美主要產(chǎn)氣頁巖及龍馬溪組頁巖相比,牛蹄塘組頁巖以Ⅰ型有機(jī)質(zhì)為主,有機(jī)孔發(fā)育規(guī)模較小,孔徑多小于5nm,甲烷吸附/脫附能力強(qiáng)。礦物粒間與粒內(nèi)孔縫是牛蹄塘組頁巖儲(chǔ)集空間與滲流通道的主要來源,高TOC含量伴隨的高石英(剛性礦物)含量有利于微觀孔縫的發(fā)育、保存及游離氣的富集。牛蹄塘組宏觀裂縫以構(gòu)造縫為主,其次為層間縫,微觀上主要為層間、粒間和粒內(nèi)縫;方解石與石英等裂縫充填物內(nèi)部發(fā)育開啟的次級(jí)微裂縫、解理和溶蝕孔隙,滑脫縫與壓扭/張扭性裂縫面糜棱化礦物粒間孔縫發(fā)育,增加了充填裂縫的有效性。在良好保存條件下,裂縫的發(fā)育對牛蹄塘組頁巖含氣性與滲透性均具有貢獻(xiàn),而對滲透性的改善是其最主要貢獻(xiàn)。當(dāng)TOC含量低于6.5%,TOC含量與孔隙度、總孔體積、脆性、蘭氏壓力、裂縫密度和游離氣含量等儲(chǔ)層參數(shù)具有正相關(guān)關(guān)系;當(dāng)TOC含量大于6.5%時(shí),正相關(guān)關(guān)系逐漸變?yōu)樨?fù)相關(guān)。有機(jī)質(zhì)類型、含量、成熟度及成巖作用對頁巖儲(chǔ)層宏觀(脆性、裂縫發(fā)育程度)與微觀(孔隙類型、孔隙結(jié)構(gòu)、甲烷吸附性)性質(zhì)均有重要影響。
[Abstract]:Based on the data of mineralogy, organic geochemistry, pore structure, methane adsorption, rock mechanical properties, fracture development characteristics and preservation conditions, the development characteristics of the shale reservoir in the lower Cambrian of the lower Cambrian group are systematically studied. The results show that the shale has high organic abundance and brittle mineral content in the shales of the lower Cambrian formation. Compared with the main gas shale and the long Ma Creek shales in North America, the shale of the cattle hoof pond group is mainly composed of type I organic matter, the organic pore is smaller, the pore size is less than 5nm, and the methane adsorption / desorption ability is strong. The intergranular and intragranular pore seams are the main source of the shale reservoir space and the seepage channel in the cattle hoof pond. Source, the content of Gao Shiying (rigid mineral) accompanied by high TOC content is beneficial to the development, preservation and accumulation of free gas in micropores. The macro cracks in the cattle hoof pond group are mainly structural seams, followed by interlayer seams, and the microcosmic mainly interlayer, intergranular and intragranular seams, and secondary microcracks and cleavage opened in the internal development of calcite and quartz fissures. In good preservation conditions, the development of the fracture has contributed to the gas and permeability of the shales of the cattle hoof and pond, and the improvement of permeability is the main contribution to the permeability. When the content of TOC is below 6.5% and TOC content, It has a positive correlation with porosity, total pore volume, brittleness, Langerhans pressure, fracture density and free gas content. When the TOC content is more than 6.5%, the positive correlation gradually becomes negative correlation. The types, content, maturity and diagenesis of the organic matter are the macro (brittle, fracture development) and microcosmic (pore type, pore) of shale. The properties of gap structure and methane adsorption have important influence.

【作者單位】： 中國石油化工股份有限公司石油勘探開發(fā)研究院;頁巖油氣富集機(jī)理與有效開發(fā)國家重點(diǎn)實(shí)驗(yàn)室;中國石油大學(xué)(北京)地球科學(xué)學(xué)院;中國國儲(chǔ)能源化工集團(tuán)股份公司;中國地質(zhì)大學(xué)(北京)能源學(xué)院;重慶科技學(xué)院復(fù)雜油氣田勘探開發(fā)重慶市重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(41202103) 國家青年科學(xué)基金項(xiàng)目(41402118) 國家科技重大專項(xiàng)(2017ZX05036002-001)
【分類號(hào)】：P534.41;P618.13
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本文編號(hào)：1802450