鄂尔多斯盆地梅塔区块长2储层特征及宏观非均质性研究

Study on Characteristics and Macro Heterogeneity of Chang2 Reservoirs in Meita Block,Ordos Basin

梅塔区块延长组长2油层组是梅塔区块的主要目的产层,目前产能低、注水效果不明显,有必要对储层特征及非均质性进行研究,以指导生产开发。长2油层组沉积属于三角平原亚相,发育分流河道微相,储层平面上砂体连片呈面状分布,平面上非均质性较强,孔隙度、渗透率的高值受分流河道主体控制。纵向上分流河道砂体内泥质夹层发育,砂体连通性差,储层非均质性强。通过对梅塔区块长2油层组岩心测试、测井资料的统计分析、砂体展布特征的研究,计算渗透率级差、突进系数、变异系数等参数,对储层的夹层频率、夹层密度进行了统计,并用平面沉积相和物性之间的关系来综合评价储层特征和非均质性。通过储层非均质性研究,对梅塔区块剩余油分布规律认识及提高采收率具有重要的意义。

As a main target pay of Meita Block.Chang2 pay zone of Meita Block Yanchang Formation is characterised by lovr yield?nd poor water injection?So it is necessary to study on its reservoir characteristics and heterogeneity to guide production and development.Chang2 pay zone is delta plain facies.and develops<listributar)-cluinnel microEacies.Sand body is distributed contiguously and planarly on the plane with strong heterogeneity,high po?rosily,and high permeability are controll?l by dislributary channel bixly.Muddy intercalations develop horizontally,in dutributaiy channel tiand with|>oor?and body connecbvity and strong neservoir^hctcrogrneity?Through core test,Mati^tical analysis on log<ktH,and study on rid body dislhbution in Chang2 reservoirs.Meita Block,permeability ratio,heterogeneity coefficient,and variation coefficient wrrr calculated;statistics on interlayer frequency and density was made;comprehensive evaluation of reservoire features and heterogeneity was made using coirclation between planar sedimentary facies and physical property.Study on rmnoira heterogeneity was of great significant to recognition of residual oil distribution law and enhancement of oil recovery in Meita Block.