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以粤中地区中生界露头剖面的地质调查及采样测试分析为基础,结合已有的资料及前人研究成果,对粤中地区金鸡组储层的岩石学、物性和孔隙结构等进行了初步研究。结果表明,金鸡组储层的岩石类型以灰色、灰白色粗—细粒石英砂岩、含砾砂岩为主;储集空间类型包括溶蚀孔洞、裂缝、粒间孔三大类;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,分选性一般,以细歪度为主,少量的粗歪度,孔隙结构总体较差。利用储层物性和孔隙结构参数,将粤中地区金鸡组砂岩评价为3类储层,其中以Ⅲ和Ⅳ类储层为主。
Based on the geological survey and sampling and analysis of the Mesozoic outcrop profile in central Guangdong Province, combining with the existing data and previous research results, the petrology, petrophysics and pore structure of the reservoirs in the middle part of Guangdong Province are studied the study. The results show that the rock types of the reservoir are mainly gray and gray-white coarse-grained quartz sandstone and pebble sandstone. The reservoir space types include three types of dissolution pores, fractures and intergranular pores. The physical properties of the reservoir are generally Low porosity and low permeability; high displacement pressure, smaller pore throat radius, general sorting, with fine crookedness, small amount of rough crookedness, poor overall pore structure. Based on reservoir physical properties and pore structure parameters, the sandstones of Jinji Formation in the middle Guangdong area are evaluated as three kinds of reservoirs, of which the reservoirs of Ⅲ and Ⅳ are the dominant ones.