松辽盆地北部泉头组三、四段储层质量预测

Reservoir Quality Prediction of the Member 3 and Member 4 of the Quantou Formation in the Northern Songliao Basin

为了预测松辽盆地北部泉头组三、四段低渗透储层的质量,首先将碎屑岩的成岩作用细分为早成岩阶段A、早成岩阶段B期、中成岩阶段A1亚期、中成岩阶段A21、A2、中成岩阶段B期。统计结果表明,成岩作用对储层的物性和含油性具有明显的控制作用,处于中成岩阶段B期的任何沉积相的砂体均不能产出工业油气流,在中成岩阶段A22只有主河道砂体的孔隙度才高于工业油气储层的孔隙度下限。应用成岩作用数值模拟技术,预测了松辽盆地北部泉三、四段的成岩阶段。泉三、四段储层的质量是沉积相和成岩作用综合影响的结果,通过叠合沉积相图和成岩阶段预测图,预测了泉四段储层类型和质量的平面分布。泉四段工业油气流井主要分布在中央坳陷Ⅲ3、Ⅲ4以及Ⅲ5类储层发育区,这些区域将成为松辽盆地北部泉四段下一步的有利勘探区。

To predict the quality of the low permeability reservoir of the Member 3 and Member 4 of the Quantou Formation in the Northern Songliao Basin,the diageneses of the clastic rocks were divided into early diagenetic stage A,early diagenetic stage B,middle diagenetic stage A1,middle diagenetic stage A21,middle diagenetic stage A22 and middle diagenetic stage B.The results of the statistical data show that diageneses have apparent controls on the physical property and oil saturation of the reservoirs,and the sand bodies of any sedimentary facies can not produce commercial oil and gas flows in middle diagenetic stage B,and only the porosity of main river channel sand bodies is higher than the porosity cutoff of commercial oil and gas reservoir.The diagenetic stages of the Member 3 and Member 4 of the Quantou Formation in the northern Songliao Basin were predicted using diagenetic numerical modeling technology.The reservoir quality of the Member 3 and Member 4 of the Quantou Formation is the result of integrated effects of sedimentary facies and diageneses.The reservoir types and quality distribution of the Member 4 of the Quantou Formation laterally were predicted by overlap the sedimentary facies map on the diagenetic stage prediction map.The commercial oil and gas well mainly located in the reservoirs of type Ⅲ3,Ⅲ4 and Ⅲ5 in Central Depression of the northern Songliao Basin,where will be the potential exploration area of the Member 4 of the Quantou Formation in the basin.