高尚堡南浅层明化镇组下段—馆陶组储层评价

通过统计分析、砂岩粒度概率累积曲线、C-M图、岩心观察等多种方法,确定了高尚堡油田南部浅层(N_m—Es₃¹)为河流沉积体系,并建立单井相、剖面相、平面相等三维可视化模型,进一步确定河流类型为冲积扇辫状水道。在沉积体系的研究基础上,利用测井解释成果(包括孔隙度、渗透率、泥质含量及油组分层数据),采用地质统计学建模技术进行了储层物性参数如孔隙度、渗透率等三维空间的定量表征。最后,结合控油因素、相组合、储油物性、储盖组合与断裂控制等评价参数,评判出主力油组3个,并确定G75-G94-G29和G3106-G30-G68-30井区为有利区块,最有利小层有明化镇组下段2亚段1层、2层、三亚段1层等14个;较有利小层有明化镇组下段2亚段3层、三亚段3层等18个小层;不利小层有明化镇组下段2亚段4层、5层、6层等15个小层。

EVALUATION OF GAONAN(Nm-Ng) SHALLOW RESERVOIRS

Statistical analysis,probability cumulative curve of sandstone grain size,C-M plot and core observation show that the shallow reservoirs in Gaoshangpu oilfield are of fluvial depositional system.3-D visiualized models have been made for the sedimentary facies in a single well,section and plane,and the fluvial type can further be classified as alluvial fan braided channel.Based on the research of depositional system,3-D quantitative characterization of reservoir's porosity and permeability has been made by using well logging interpretation data(including porosity,permeability,shale content and oil-reservoir groups)and geostatistical modeling technology.Lastly,according to the evaluation parameters,including control factor of oil,facies association,reservoir-cap rock association and faults,3 major reservoir groups have been pointed out,and G75-G94-G29 and G3106-G30-G68-30 well blocks are determined to be the most favourable blocks.There are 14 layers evaluated to be the most favorable pay beds,including the 1st and 2nd layer in the 2nd submember and the 1st layer in the 3rd submember of the lower member of Minghuazhan Formation;and there are 15 layers evaluated to be relatively favorable pay beds,including the 3rd layers in the 2nd and 3rd submembers of the lower member of Minghuazhen Formation;while the other 15 layers are evaluated as unfavorable layers,including the 4th,5th and 6th layers in the 2nd submember of the lower member of Minghuazhen Formation.