primary porosity

The influences of diagenesis on the reservoir physical properties are mainly the change of porosity and permeability. Compaction and cementation of the reservoir rocks makes the primary pores and permeability decreased quickly, which is the main causes of the poor physical properties;

成岩作用对储集物性的影响主要表现在孔隙度和渗透率的变化，其中压实作用和胶结作用使储层原生孔隙迅速减少、渗透率降低，使得储集物性变差；

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The type of pore is mainly vuggy porosity, and primary intergranular pores, relatively undeveloped, is as the second place among the reservoir pores.

孔隙类型主要为各种溶蚀孔，其次为原生粒间孔。

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The results showed that the graphite deposited during the period of primary and eutectic crystal helped to reduce the contract of liquid state and solidification, to improve the tendency of shrinkage cavity and porosity.

实验结果表明，初晶、共晶期间析出的石墨有助于减少液态收缩与凝固收缩，改善耐热球墨可锻铸铁形成缩孔缩松的倾向。

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The calculation method of primary wave and second wave speed were studied when the oil saturation and effective pressure of unconsolidated sandstone reservoir with high porosity in X Oilfield changed.

研究了X油田高孔低胶结砂岩储层在含油饱和度和压力变化时纵、横波速度计算方法，并将计算数据与实际测井资料进行了对比。

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