But it will fail to recognize the gas bearing bed buried deeper by the two methods as its porosity log feature is not obvious, especially when density porosity is lower than neutron porosity.
但是，对埋藏较深的气层而言，由于其孔隙度曲线特征并不明显，故用常规方法识别十分困难，特别是当密度孔隙低于中子孔隙度时，上述两方法识别气层均失败。
The porosity and permeability of coal-bearing strata have important influence to the exhaust and mining of coal bed gas, but the production of coal bed gas is precondition of its richen.
煤系地层孔隙性和渗透率对煤层气的抽放、排采具有重要影响，但煤层气的生成却是其富集的先决条件。
Experiments showed decreased porosity of the filter bed along the filtering direction.
试验发现，短纤维束滤料滤层的孔隙率沿过滤方向由大到小，为变孔隙滤层。
The anolyte ow rate was measured with a rotameter, which gave a velocity of the electrolyte in the packed bed of around 0.2 m s1, taking the porosity into account.
那个阳极低利率是衡量一个浮子，这了速度电解质中的填料床的围绕0.2米一，要考虑的孔隙度到。
Due to deep reservoir bed, Anpeng Oilfield is a typical sand oil and gas reservoir with high temperature, high pressure, low porosity and poor permeability.
安棚油田储层埋藏深，属于典型的高温高压特低孔特低渗裂缝砂岩油气藏。
The turbulence coefficient and permeability is re lated with the grain size, sphericity and roughness of the proppant, and the porosity of the proppant-filling bed, and the experimental conditions.
紊流系数和渗透率与支撑剂粒度、球度、圆度、支撑剂充填层孔隙度和实验条件等有关。
The shell limestone is thin bed, compact and anisotropism, so the reservoir is of low porosity, low permeability and pore fracture character.
介壳灰岩层薄、致密、非均质性强，属低孔、低渗孔隙—裂缝性储层。
Nuclear magnetic logging is a high technology and only by which the free fluid porosity of an oil-bearing bed can be measured directly.
核磁测井是当代唯一能够直接测量油层自由流体孔隙度的高技术。
The coal bed has a low mechanical strength and porosity in comparison with the normal oil and gas formation, so it is easy to collapse and easy to be polluted.
煤层与一般油气层相比，机械强度低，孔隙度低，所以易坍塌、易污染。
The coal bed has a low mechanical strength and porosity in comparison with the normal oil and gas formation, so it is easy to collapse and easy to be polluted.
煤层与一般油气层相比，机械强度低，孔隙度低，所以易坍塌、易污染。
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