粤东粤中地区侏罗系储层特征研究

Jurassic Reservoir Characteristics in Central and Eastern Guangdong Province

以野外地质调查及样品测试分析为基础,对粤东粤中地区侏罗系储层的发育情况、储层岩石学、物性及孔隙结构特征等进行了研究。研究表明:区内侏罗系储层以粗—细粒石英砂岩为主;储集空间类型以次生孔隙为主,包括粒间溶孔、溶蚀缝、粒内溶孔、铸模孔及(微)裂缝;储层物性总体表现为中—低孔低渗、排驱压力较高、孔喉半径较小、歪度偏细及孔隙结构参数总体较差的特征。在此基础之上,将侏罗系储层分为4类,其中以Ⅱc和Ⅲa类储层为主。

For the Jurassic reservoirs in central and eastern Guangdong Province,the growth,petrology,physical properties and pore structure were studied based on field investigation and sample test.The studied results demonstrate that(1)the Jurassic reservoirs are mainly composed of coarse-to fine-grained quartz sandstone;(2)reservoir space is mainly secondary pore,including intergranular dissolution pore,dissolution fractures,intragranular dissolution pore,casting pore and microfracture or fracture;and(3)the physical properties are usually featured by middle to low porosity and low permeability,much higher displacement pressure,very little porous-throat radius,gentle skewness and poor porous structure.Based on the study,the Jurassic reservoirs can be classified into four types with the IIc-type and IIIa-type as the soul.