覆压

孔隙度、渗透率与净覆压的规律研究和应用

The research and application of permeability , porosity and net overburden pressure laws

结果表明：油层孔隙度、渗透率与净覆压的关系以一元二次方程最为密切；

The research shows that the relationship between formation porosity , permeability and net overburden pressure is closely related to univariate quadratic equation ;

孔隙度与净覆压间按指数规律拟合时，代表的物理意义更为明确，既能满足精度的要求，又能自动得出岩石的压缩系数。NET技术思想和基于。

When porosity matches net overburden pressure with exponent relationship , the presented physical significance is clearer , the accuracy requirement can be met and the compressibility of rocks can gained automatically .

与常规岩心分析结果相比，油藏条件下（净覆压大于20MPa）孔隙度约减小3%～10%，渗透率约减小12%～70%。

Compared with the results of conventional core analysis , under reservoir conditions ( net overburden pressure > 20MPa ), porosity decreases about 3 % to 10 % , permeability increases about 12 % to 70 % .

低渗透储层岩石覆压实验变形特征分析

The deformation characteristics of low permeability reservoir rocks under confining pressure

气藏的成藏类型有：①低覆压准散失型常压气藏；

They are low overlain pressure para lost pools with normal pressure ;

全自动覆压孔渗联测系统设计

The design of the full - automatic core system

中覆压富（满）集型常压气藏；

Middle overlain pressured abundant ( full ) gas pools with normal pressure ;

地表油页岩由于覆压减小等影响，页理张开、孔隙增加、密度减小。

The oil shale on the surface show opening foliation , abundant pore volume and low density because of less overburden pressure .

结果表明：净覆压对储层的孔隙度、渗透率和岩石压缩系数具有明显的影响，对储层岩石孔隙结构影响较小；

The results show that net burden pressure has obvious influence on porosity , permeability and rock compacting factor with little effect on pore configuration .

结果表明，随机覆压下，储层物性随围压的增加呈单调圆滑下降的趋势；

As a result , the tendency of curves is humdrum decrease with the random stress increasing while there are some steps under the controlled stress .

渤海渤中34-1、渤中28-2等油田（主要含油层为疏松砂岩）储量评价中采用了覆压条件下岩石电阻率测量结果。

For BZ34-1 and BZ28-2 oilfields where the main oil reservoirs are unconsolidated sand , the rock resistivity data measured under overburden pressure is used in reserves evaluation .

通过在香四气藏岩心实验的基础上，建立了该气藏孔隙度覆压校正模型。该方法测定的孔隙度与传统方法相当，可以用于储量计算。

On the basis of core experiment from Xiang-4 gas pool , the model of this pool porosity corrected by overburden pressure is founded , this method of measuring porosity corresponding to the traditional one may be used in reserves calculation .

上覆超压带对下伏油气藏具有良好的封闭保存作用；

The overlying super-high pressure zone acts as good seal to underlying hydrocarbon accumulation ;

岩组分析说明，NE向断裂具有早期逆冲推覆，主压应力属NW&SE向应力系统；

Dynamic features show that the NE-trending faults thrusted at the early stage and their main stress belongs to NW SE stress system , but at the later stage they were normal faults and the main stress orientation changed to SSE NNW or SN trending .

远程覆岩卸压变形及其渗透性研究

Deformation and permeability characteristics caused by pressure-relief of long-distance strata

真空排水联合覆水预压裂缝成因分析及防治

Causes Analysis and Prevention of Cracks in Compounding Method of Vacuum Drainage and Water Preloading

高瓦斯综采面顶板覆岩卸压抽放瓦斯试验研究

Methane drainage experimental research for the stress-relief roof stratum of working face of high gas coal seam

上覆远程卸压岩体移动特性与瓦斯抽采技术

Gas extraction techniques and movement properties of long distance and pressure relief rock mass upon exploited coal seam

地面钻井抽放上覆远距离卸压煤层气试验研究

Study on Drainage of Relieved Methane from Overlying Coal Seam Far Away from the Protective Seam by Surface Well

根据储层中上覆岩石围压变化，通过室内试验表述了其对渗透率伤害。

Based on the change of stress from upside rock in the reservoir , the damage to permeability is illustrated by the lab experiment .

分析了上覆岩层来压规律对煤炭开采过程中的安全影响，以此为在采空区下安全采煤防止上覆岩层裂隙水的侵入提供有效的理论和实践上的依据。

Analyse the safety influence of the law of overlying strata pressure to the coal exploitation , so provide the effective bases of the theory and practice for the safety mining coal under close quarters goal , and prevent the cranny water of overlying strata inrushing .

采用FLAC2D有限元数值模拟和现场实测的方法，对下保护层开采引起覆岩的卸压变形进行了研究和分析。

This paper analyzed and studied the deformation of overburden stratum by FLAC2D finite element numerical simulation and colliery on the test .

通过数值模拟和相似模拟实验相结合的研究方法，得出采动覆岩的卸压范围及煤岩碎胀系数分布特征；

Based on the research methods of connecting the numerical simulation with the model experiment , the zone of relieved pressure and the distribution feature of coal expansion factor in mining overlying stratum are obtained .