中深部碎屑岩储集层异常高孔隙度段划分方案及研究意义
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摘要
异常高孔隙度段的划分对指导中深层碎屑岩储集层油气勘探有重要意义。以东营凹陷南部缓坡带古近系沙河街组沙四上亚段滩坝砂岩储集层为研究对象,通过物性测试、统计学分析等方法对其异常高孔隙度段进行划分。划分方案1通过确定混合岩相砂岩储集层最大正常孔隙度演化趋势线;将大量发育高于该演化趋势线物性数据点,且孔隙度包络线向孔隙度高值方向突出、孔隙度物性数据点集中分布的深度段划分为异常高孔隙度段。划分方案2利用给定深度区间孔隙度分布直方图分布形态,确定正常与异常孔隙度分界点,拟合正常与异常孔隙度分界趋势线;与划分方案1相同的原则确定异常高孔隙度段。结果表明,研究区目标层位存在2110~2400 m、2540~3000 m、3100~3600 m埋深范围的3个异常高孔隙度段。
The accurate determination method of anomalously high porosity sections is critical for the exploration of middle and deep burial clastic reservoirs. Taking the reservoirs of the upper part of the fourth member of the Shahejie Formation( Es4s) in the south slope of the Dongying Sag as the research object,porosity testing,and statistical analysis were used to evaluate the division of anomalously high porosity sections. The first strategy raise the maximum porosity trend of mixed lithofacies sandstone reservoirs. The anomalously high porosity sections would have high anomaly of porosity envelop and concentrated distribution characters of reservoir. The second method determine the boundary normal and abnormal porosity through the shape of porosity distribution histogram,and then form the boundary between normal and abnormal porosity. Anomalously high porosity sections were then defined with the same rule as the first method. The results show that there are three anomalously high porosity sections in Es4 s in the south slope of the Dongying Sag,with burial depth of 2110 ~2400 m,2540 ~ 3000 m,and 3300 ~ 3700 m,respectively.
The accurate determination method of anomalously high porosity sections is critical for the exploration of middle and deep burial clastic reservoirs. Taking the reservoirs of the upper part of the fourth member of the Shahejie Formation( Es4s) in the south slope of the Dongying Sag as the research object,porosity testing,and statistical analysis were used to evaluate the division of anomalously high porosity sections. The first strategy raise the maximum porosity trend of mixed lithofacies sandstone reservoirs. The anomalously high porosity sections would have high anomaly of porosity envelop and concentrated distribution characters of reservoir. The second method determine the boundary normal and abnormal porosity through the shape of porosity distribution histogram,and then form the boundary between normal and abnormal porosity. Anomalously high porosity sections were then defined with the same rule as the first method. The results show that there are three anomalously high porosity sections in Es4 s in the south slope of the Dongying Sag,with burial depth of 2110 ~2400 m,2540 ~ 3000 m,and 3300 ~ 3700 m,respectively.
引文
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