裂缝型储层五维地震有效压力参数预测

裂缝型储层是目前油气勘探开发的重要领域之一,有效压力预测在此类油气藏的开发中发挥着重要作用。有效压力可由有效压力参数计算得到,具有丰富方位及偏移距等信息的五维地震数据为裂缝型储层有效压力参数预测提供了基础资料。基于各向异性Gassmann方程和线性滑动理论,结合Smith有效压力参数函数和临界孔隙度模型,推导出由有效压力参数、流体体积模量和裂缝法向及切向裂缝弱度参数直接表征的正交各向异性(OA)介质纵波反射系数弱各向异性近似方程。在此基础上,提出了五维地震时频域分步反演方法,即在分步反演策略的基础上,综合利用时间域地震反演的抗噪性和频率域反演的高分辨率优势,提高预测精度。基于五维地震频率和振幅信息及岩石、测井和地质资料,实现了裂缝型储层有效压力参数及流体参数和裂缝法向及切向裂缝弱度参数的直接预测。模型测试和实际数据应用结果表明,反演结果与井上实际数值吻合程度较高,为裂缝型储层五维地震有效压力预测提供了一种可靠的方法。

空气幕技术在阻断矿井漏风中的应用

在通风系统改造过程中 ,应用“有效压力理论”充分利用闲置设备 ,自行设计制造了节能空气幕 ,既节省了空气幕的成品购置费用 ,又解决了系统的漏风问题。

应用自制空气幕阻断矿井漏风的现场实践

根据“有效压力理论”,充分利用闲置设备,自行设计制造了节能空气幕。既节约了设备费用,又解决了矿井通风系统的漏风问题。同时,不影响正常生产运输。

自制空气幕替代风门阻断井底车场漏风的实践

依据“有效压力理论”自行设计制造了节能空气幕。既节约了设备费用,又解决了矿井通风系统的漏风问题,同时又不影响行车运输。

矿用空气幕在矿井阻风中的应用

金岭铁矿在井下漏风点应用空气幕阻断漏风，为解决井下运输繁忙的巷道的漏风问题开辟了新的途径。

Evaluation of Effective Stresses and State Surfaces for Unsaturated Clayey Silt

Terzaghi had established soil mechanics as an academic scholarship due to the discovery of the principal of effective stress for saturated soils when he considered the consolidation theory of saturated clay. The reason of the existence of the effective stress is that soil particles and water are composited by incompressible solid and liquid. Although air is very compressible fluid, the principle of effective stress is also used in unsaturated soils in the resent developed numerical analyses. Schrefler＇s equation is most frequently used, but the effective stress is not verified by the experimental results. In this study, the equations for unsaturated soils proposed by Schrefler, Aitchison, Khalili and Khabbaz and Kohgo are compared with using the results of suction controlled consolidometer tests. As a result, the effective stress for unsaturated soils calculated by Schrefler＇s equation was average of them.