流纹岩类火山岩储层物性特征研究

火山岩油气藏储层岩石类型特殊、孔隙结构复杂,在开发过程中其储层物性将会对采出程度产生一定的影响,利用火山岩气田升深2-1井的流纹岩岩心、测井资料,通过对流纹岩岩石物性参数随净上覆岩层压力变化的实验研究,对实验结果进行处理分析,得出了一些有益的结论:该流纹岩岩石孔隙度随净上覆岩层压力呈多项式(三项式)函数变化关系、渗透率与净上覆岩层压力之间的关系满足幂指数关系、储层岩石的压缩系数与净上覆岩层压力之间的关系满足指数关系、岩石密度和孔隙度之间具有很好的线性关系。从而更进一步认识了该流纹岩储层的物性特征,为该特殊岩石气藏的合理开发提供了有利的基础资料。

RESEARCH OF THE RESERVOIR PHYSICS PROPERTIES CHARACTERISTICS OF THE VOLCANIC ROCKS OF RHY-OLITE TYPE

The volcanic rocks reservoir has special types and complex pore structure. Reservoir physics properties will affect the produced degree of crude oil (gas) during development. The material of rhyolite core sample and well-logging of Shengshen 2-1 well is used in rhyolite volcanic rocks gas field. Through the ex-perimental study of petrophysical parameter varied with net overburden pressure. The experimental result is treated and analyzed ,some beneficial conclusion is obtained : Both that of the porosity of rhyolite volcanic rocks reservoir came along net overburden pressure submit polynomial(trinomial)function change relation; Both that of permeability of rhyolite volcanic rocksreservoir changed along with net overburden pressure satisfy power exponent relation; reservoir rock compressibility coefficient and net overburden pressure of compartment relation satisfied exponential relation type; rock densities and porosity contents corking linear relationship. The physical property charac-teristic of rhyolite volcanic rocks reservoir farther known knows clearly. This favorable base data is supplied for determining rational exploitation scheme of volcanic rocks gas reservoir.