深部泥巖滲透率測(cè)試方法及數(shù)據(jù)適用性分析
發(fā)布時(shí)間:2019-05-28 01:48
【摘要】:針對(duì)深部地層同一種泥巖,先后采用常規(guī)滲透測(cè)試、變圍壓滲透測(cè)試和三軸壓縮下瞬態(tài)法3種方法開(kāi)展?jié)B透率的測(cè)試研究。試驗(yàn)發(fā)現(xiàn),3種方法下泥巖的滲透率差別極大,其中常規(guī)滲透測(cè)試所得的滲透率高出后兩種方法 3~5個(gè)數(shù)量級(jí);變圍壓法在圍壓大于5 MPa后與三軸壓縮下的瞬態(tài)法所測(cè)得的滲透率值較為接近;瞬態(tài)法下泥巖滲透率隨偏應(yīng)力增加而緩慢降低,偏應(yīng)力高達(dá)30 MPa時(shí)仍未出現(xiàn)擴(kuò)容現(xiàn)象。測(cè)試顯示泥巖的滲透率具有強(qiáng)烈的壓力敏感性,其內(nèi)在原因是較高圍壓下裂隙閉合、孔隙壓緊、孔喉連通性減小,進(jìn)而導(dǎo)致滲透率下降,而制樣、烘干處理等對(duì)滲透率也有一定影響;谠囼(yàn)結(jié)果與泥巖所處實(shí)際地層應(yīng)力狀態(tài),提出可采用變圍壓法開(kāi)展油氣儲(chǔ)集層的蓋層的滲透率及其演化規(guī)律研究,而三軸壓縮下瞬態(tài)法則更適用于能源儲(chǔ)庫(kù)蓋層及核廢料處置室圍巖的滲透規(guī)律研究;常規(guī)滲透方法所得數(shù)據(jù)的應(yīng)用則須商榷。研究結(jié)論對(duì)研究深部泥巖的滲透特性和密封性能有一定參考價(jià)值。
[Abstract]:Three methods, conventional permeability test, variable confining pressure permeability test and transient method under triaxial compression, are used to test the permeability of the same mudstone in deep strata. It is found that the permeability of mudstone under the three methods is very different, among which the permeability of the conventional permeability test is 3 鈮,
本文編號(hào):2486625
[Abstract]:Three methods, conventional permeability test, variable confining pressure permeability test and transient method under triaxial compression, are used to test the permeability of the same mudstone in deep strata. It is found that the permeability of mudstone under the three methods is very different, among which the permeability of the conventional permeability test is 3 鈮,
本文編號(hào):2486625
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