松辽盆地葡北地区萨零组储层识别及展布特征

Reservoir identification and distribution characteristics of Sa-0 oil reservoir in Pubei area,Songliao Basin

为探寻松辽盆地葡北地区上白垩统姚家组葡萄花油层的增储层位,对位于该油层之上的萨零组储层开展了滚动挖潜研究。基于岩电特性的测井岩性识别技术,结合高分辨率三维地震的薄互层储层预测技术,建立了针对性储层识别图版及识别标准,明确了储层展布特征,落实储量接替层位。萨零组储层发育深湖沉积,湖相泥岩背景下存在局部发育的重力流水道砂质沉积,具有储集能力及含油显示。对应储层识别标准为:泥质含量≤30%、孔隙度≥8%、渗透率≥0.1 mD、声波时差≥10μs/ft,深侧向电阻率同时满足≥34.9e^(-0.0165DT)和≥8970919200e^(-0.3DT)。平面上,重力流水道呈条形展布,具有分布面积小、厚度相对较大的特点。井壁取心物性分析表明,有效孔隙度约为17.8%,有效渗透率约2.23 mD,储层物性好,油气显示级别以油斑为主,储层类型为Ⅰ类好储集层—Ⅱ类中等储集层。综合认为,萨零组重力流水道储层可以形成具有工业价值的油藏。

In order to explore the reservoir increasing position of Putaohua oil layer of Yaojia Formation of Upper Cretaceous in Pubei area of Songliao Basin,a rolling potential tapping study was carried out on the reservoir of Sa-0 oil reservoir above this oil layer.Using the logging lithology identification technology,based on the study of rock electrical characteristics,combined with the thin interbed reservoir prediction technology based on highresolution 3-dimensional seismic,the targeted reservoir identification chart and identification standard are established to clarify the reservoir distribution characteristics and implement the reserve replacement layer.Deep lake deposits are developed in Sa-0 oil reservoir.Locally developed gravity channel sandy deposits are under the background of lacustrine mudstone,with reservoir capacity and oil-bearing display.The corresponding reservoir identification criteria are:shale content≤30%,porosity≥8%,permeability≥0.1 mD,acoustic time difference≥70μs/ft,deep lateral resistivity≥34.9e^(-0.0165DT) and≥8970919200e^(-0.3DT).On the plane,the gravity flow channel is distributed in strips,with the characteristics of small distribution area,but relatively huge thickness.The physical property analysis of sidewall coring shows that the effective porosity is about 17.8%.The effective permeability is about 2.23 mD.The reservoir physical property is good.The oil and gas display level is a main oil spot,with ClassⅠgood reservoir and ClassⅡmedium reservoir.It is comprehensively considered that the gravity flow channel reservoir of Sa-0 oil reservoir can form a reservoir with industrial value.