CAJ | 학술논문

基于高精度显微CT技术，采用多孔介质三维逾渗理论，计算不同温度下油页岩试件(φ0.82 mm×7 mm)真实三维数字 CT岩芯的逾渗概率。逾渗概率的大小实质上反映多孔介质内部最大连通孔隙团的分布程度，可对多孔介质的连通性进行直观、准确地判定，避免因为统计对渗透性无贡献的“小级别死端孔隙”而造成对多孔介质渗透性优劣的误判。当温度达到300℃～400℃，油页岩孔隙率为8%～12%时，逾渗概率开始快速增长，最大孔隙团已完全连通三维数字CT岩芯的上、下两端，证明油页岩内部发生逾渗转变，逾渗阈值应处于8%～12%范围内。研究表明：随着温度的上升，当油页岩孔隙率低于8%时，孔隙连通团的连通性很差，相互隔离，导致流体难于渗透；而当孔隙率高于12%时，孔隙连通团的连通性很好，渗流通道变得十分通畅，更易于油气的产出和高温流体的注入。该较低的逾渗阈值范围大大降低了油页岩开发、利用的难度，为实现大规模油页岩原位注热开发提供有力的技术支撑。
기우고정도현미CT기술，채용다공개질삼유유삼이론，계산불동온도하유혈암시건(φ0.82 mm×7 mm)진실삼유수자 CT암심적유삼개솔。유삼개솔적대소실질상반영다공개질내부최대련통공극단적분포정도，가대다공개질적련통성진행직관、준학지판정，피면인위통계대삼투성무공헌적“소급별사단공극”이조성대다공개질삼투성우렬적오판。당온도체도300℃～400℃，유혈암공극솔위8%～12%시，유삼개솔개시쾌속증장，최대공극단이완전련통삼유수자CT암심적상、하량단，증명유혈암내부발생유삼전변，유삼역치응처우8%～12%범위내。연구표명：수착온도적상승，당유혈암공극솔저우8%시，공극련통단적련통성흔차，상호격리，도치류체난우삼투；이당공극솔고우12%시，공극련통단적련통성흔호，삼류통도변득십분통창，경역우유기적산출화고온류체적주입。해교저적유삼역치범위대대강저료유혈암개발、이용적난도，위실현대규모유혈암원위주열개발제공유력적기술지탱。
The percolation probabilities of the actual oil shale sample of the size of φ0.82 mm×7mm at different temperatures were calculated according to the data from the three-dimensional micro-CT using the three-dimensional percolation theory for porous media. The values of the percolation probability reflected the distribution of the largest groups of connected pores and the degree of the connectivity of the porous media, which avoided the influence of the smaller pore group on the judging of the permeability of porous media. When the temperature was in the ranges of 300 ℃ to 400 ℃ and the porosity of the oil shale was 8%-12%,the percolation probability increased quickly. The largest group of pores connected completely the two ends of up and down of the three-dimensional rock core. The percolation transition occurred with the percolation threshold value in the range of 8%-12%for the oil shale. The percolation of the fluid was found to be difficult when the porosity was smaller than 8%. When the porosity was larger than 12%,pore connectivity was good for output and input of the oil gas.