银额盆地哈日凹陷白云岩储层研究

Dolomite reservoirs in Hari sag of Yiner basin

通过岩心观察、测井解释、扫描电镜等研究手段,结合常规储层物性分析方法对哈日凹陷湖相白云岩储集特征进行研究,结果表明,银额盆地白云岩储层发育良好,储层以泥质白云岩为主,溶蚀孔及层间裂缝较为发育,孔隙度平均为6.73%,渗透率平均为0.025×10-3 μm2,属于特低孔超低渗储层;白云岩的成因机理主要为“微生物白云化”和“蒸发泵作用”.

The reservoir characteristics of lacustrine dolomite in Hari sag are studied by means of core observation,well logging interpretation,scanning electron microscope and conventional reservoir property analysis.The results show that the dolomite reservoir in Yiner basin is well developed.The reservoir is mainly of argillaceous dolomite,and the dissolution pores and interlayer fractures are well developed.The average porosity is 6.73%and the average permeability is 0.025×10–3μm2,which belongs to ultra-low porosity and ultra-low permeability reservoirs.The genesis mechanism of dolomite is mainly‘microbial dolomitization’and‘evaporative pump action’.