本文關(guān)鍵詞： 孔隙 微裂縫 高煤級煤巖 壓汞 最終采收率　出處：《礦物巖石》2017年01期 　論文類型：期刊論文

【摘要】：基于沁水盆地東北部和順煤層氣區(qū)塊高煤級煙煤儲層的物性、壓汞及掃描電鏡資料,對該煤層氣儲層的孔隙結(jié)構(gòu)特征進(jìn)行分析。該煤儲層RO值分布在1.8~2.5,為貧煤,其鏡質(zhì)組含量主要分布在62%~80%,平均約為70.02%;惰質(zhì)組含量主要分布在10%~25%,平均約為18.48%;V/I(鏡質(zhì)組/惰質(zhì)組)值主要分布在2~30之間。所研究煤儲層中的有效空間系統(tǒng)以孔隙和微裂縫為主,建立了同時考慮孔隙和微裂縫的高煤級煤巖階段入汞及退汞過程曲線模型。入汞曲線模型與煤巖滲透率具有較好的匹配關(guān)系,在分析煤巖孔隙系統(tǒng)連通性方面比退汞曲線模型更為可靠。微裂縫相對發(fā)育的煤巖滲透率較高,排采初期往往具有較高產(chǎn)能,但其產(chǎn)能遞減相對較快,最終會有相當(dāng)一部分天然氣滯留于地層中而無法被開采,因此最終采收率相對較低。微裂縫欠發(fā)育的煤樣滲透率較低,開發(fā)初期產(chǎn)能較低,但其生產(chǎn)周期卻相對較長,最終采收率相對較高。因此,對于國內(nèi)部分地區(qū)微裂縫發(fā)育情況相對較差的煤儲層而言,初產(chǎn)能力可能相對偏低。但從長遠(yuǎn)來看,由于其最終采收率更高,生產(chǎn)周期較長,最終累積產(chǎn)氣量也會更大。該認(rèn)識可以為煤層氣排采開發(fā)方案的合理制定提供參考。
[Abstract]:Based on the physical properties, mercury injection and scanning electron microscope data of high-grade bituminous coal reservoirs in the northeastern Qinshui Basin and the coalbed methane block of Shun. The pore structure characteristics of the coalbed methane reservoir are analyzed. The RO value of the coal reservoir is 1.8% 2.5, which is lean coal. The vitrinite content of the reservoir is mainly distributed in 62% ~ 80%. The average value is about 70.02; The content of inertinite is mainly distributed in 10 and 25, with an average of 18.48; The values of vitrinite / inertinite (vitrinite / inertinite) are mainly distributed in the range of 20.The effective space system in the studied coal reservoir is dominated by pores and micro-fractures. The mercury and mercury removal process curve model of high coal rank coal is established, which considers both pores and micro fractures. The mercury injection curve model has a good matching relationship with coal and rock permeability. It is more reliable to analyze the connectivity of pore system of coal and rock than the model of mercury removal curve. The permeability of coal and rock with relatively developed micro-fractures is higher, and the productivity of coal and rock is usually high in the early stage of discharging mining, but the productivity decline is relatively fast. In the end, a considerable part of natural gas will remain in the formation and can not be exploited, so the final recovery factor is relatively low. The permeability of coal samples with underdeveloped micro-fractures is lower, and the initial production capacity is lower. However, the production cycle is relatively long and the final recovery is relatively high. Therefore, for coal reservoirs with relatively poor development of micro-fractures in some areas of China, the initial production capacity may be relatively low, but in the long run. As the final recovery is higher and the production cycle is longer, the final cumulative gas production will also be greater. This understanding can provide a reference for the rational formulation of the development plan of coal bed methane (CBM) exhaust production.
【作者單位】： 北京奧能恒業(yè)能源技術(shù)有限公司;華北油田公司勘探開發(fā)研究院;浙江油田分公司地質(zhì)與工藝研究院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41372139,41072098) 國家科技重大專項(xiàng)專題(2011ZX05018-001-002,2011ZX05009-002-205,2011ZX05033-004)
【分類號】：TE319
【正文快照】： p苝，

本文編號：1465099