渭北油田长3、长6、长7储层成岩过程中孔隙演化分析

Weibei oilfield chang 3,chang 6,chang 7 diagenetic pore evolution process analysis

渭北油田延长组大量样品的物性分析及铸体薄片镜下记点统计为定量研究孔隙演化提供了依据。通过对未固结砂岩初始孔隙度,湿砂压实后剩余粒间孔隙度,砂岩压实、胶结、交代后的剩余粒间孔隙度,次生孔隙度,孔隙度演化计算过程中误差的计算分析,表明长6、长7油层组的胶结作用明显强于长3油层组,长3油层组的溶蚀作用明显强于长6、长7油层组。

Weibei Yanchang Oilfield physical properties of large numbers of samples analyzed and recorded points cast thin microscopic for quantitative research of porosity evolution provides a basis.By calculating the residual inter-grain porosity sandstone compaction,cementation,after inter-account surplus grain porosity,secondary porosity,porosity evolution calculated initial unconsolidated sandstone porosity,wet sand compaction process errors analysis showed that chang 6,chang 7oil group was significantly stronger cementation than the chang 3oil group,long 3oil group was significantly stronger dissolution than the chang 6,chang 7oil group.