本文選題：保靖地區(qū) + 海相頁(yè)巖�。� 參考：《中國(guó)石油勘探》2017年04期

【摘要】：頁(yè)巖吸附氣量是含氣性評(píng)價(jià)和資源潛力預(yù)測(cè)的關(guān)鍵參數(shù),保靖地區(qū)志留系龍馬溪組海相頁(yè)巖熱演化程度高,頁(yè)巖吸附氣量尚未查明,成為亟待研究的關(guān)鍵問(wèn)題。采集研究區(qū)BY-1井龍馬溪組頁(yè)巖巖心樣品12個(gè),開(kāi)展了頁(yè)巖TOC、熱成熟度(R_o)、X射線衍射、場(chǎng)發(fā)射掃描電鏡、低壓液氮吸附和高壓甲烷等溫吸附等分析測(cè)試。結(jié)果表明,研究區(qū)海相頁(yè)巖有機(jī)質(zhì)豐度高,TOC范圍是0.57%~2.16%;熱演化程度高,R_o的范圍為2.86%~3.76%;礦物組分中石英含量為33.7%~73.9%,斜長(zhǎng)石含量為0.7%~16.9%,黏土礦物含量為15.8%~54.4%;頁(yè)巖中納米級(jí)孔隙發(fā)育,以粒間孔和有機(jī)質(zhì)孔為主;低壓液氮吸附實(shí)驗(yàn)結(jié)果展示頁(yè)巖孔徑分布范圍寬,以2~50nm的中孔為主;高壓等溫吸附實(shí)驗(yàn)揭示保靖地區(qū)龍馬溪組頁(yè)巖的吸附氣量較高,為0.82~3.56m3/t,平均為1.93m3/t。保靖地區(qū)頁(yè)巖吸附氣量主要受到有機(jī)質(zhì)豐度和中孔、微孔比表面積的控制,龍馬溪組頁(yè)巖有機(jī)質(zhì)處于高成熟階段,有機(jī)質(zhì)熱演化產(chǎn)生大量的微孔和中孔,二者比表面積較大,為頁(yè)巖氣吸附提供了較大的空間,頁(yè)巖的吸附氣量大。
[Abstract]:Shale adsorptive gas capacity is a key parameter for gas bearing evaluation and resource potential prediction. The thermal evolution of marine shale of Silurian Longmaxi formation in Baojing area is high and the amount of shale adsorbed gas has not been determined. Twelve samples of shale cores from Longmaxi formation in BY-1 well were collected and analyzed by means of TOC, thermal maturity (Ro) X ray diffraction, field emission scanning electron microscopy, low pressure liquid nitrogen adsorption and high pressure methane isotherm adsorption. The results show that the TOC range of marine shale organic matter abundance is 0.57 ~ 2.16; the range of high thermal evolution is 2.86 ~ 3.76; the quartz content of mineral component is 33.773.9%, the plagioclase content is 0.7 ~ 16.9, and the clay content is 15.88 ~ 54.4; the nanometer pore is developed in shale, and the content of plagioclase is 15.84.4. The results of low pressure liquid nitrogen adsorption experiments show that the pore size distribution of shale is wide, and that of 2~50nm is the main pore. The high pressure isothermal adsorption experiment shows that the gas adsorption capacity of Longmaxi formation shale in Baojing area is relatively high, which is 0.82m3.56m3 / t, with an average of 1.93m3t. The amount of gas adsorbed by shale in Baojing area is mainly controlled by the abundance of organic matter and the specific surface area of mesopore and micropore. The organic matter of Longmaxi formation is in the high mature stage, and the thermal evolution of organic matter produces a large number of micropores and mesoporous areas. It provides a large space for the adsorption of shale gas, and the amount of gas adsorbed by shale is large.
【作者單位】： 神華地質(zhì)勘查有限責(zé)任公司;中國(guó)石油大學(xué)(北京)非常規(guī)天然氣研究院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目“頁(yè)巖非均質(zhì)性和微—納米孔喉結(jié)構(gòu)對(duì)含氣性的控制機(jī)理編號(hào)”(41472112)
【分類號(hào)】：P618.13

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