镇泾地区三叠系延长组储层评价

RESERVOIR EVALUATION OF YANCHANG FORMATION,TRIASSIC,AT ZHENJING REGION

本文针对鄂尔多斯盆地南部镇泾地区的勘探开发前景 ,为寻找有利储层 ,从 15 7件岩石薄片和 90件铸体薄片分析鉴定入手 ,对三叠系延长组碎屑岩的沉积特征、储层孔隙结构及物性特征研究 ,认为延长组砂岩储集体有利相带为三角洲前缘水下分流河道和河口砂坝沉积微相 ,砂岩为低孔特低渗储层。孔隙类型为剩余原生粒间孔、次生粒间孔、泥质内微孔及少量粒内溶孔和铸模孔。并探讨储层物性与岩性和沉积相之间的关系 ,提出 8%孔隙度和 0 .1× 10 -3 μm2 渗透率为储层下限 ,用多参数将砂岩分为五类 ,长 9、长 10油层组以Ⅰ类储层为主 ,长 7油层组以Ⅱ类为主 ,Ⅲ、Ⅳ类次之 ;长 6、长 5油层组多以Ⅲ、Ⅳ类为主。这一分析为今后的勘探开发指明了方向 。

In order to open up a vast range of prospects for oil and gas exploration and development at Zhenjing region in South E'erduosi Basin,for surveying fair reservoirs a research on the depositional features,pore structure and petrophysical properties of the clastic rocks in Yanchang Formation,Triassic,was carried out on the basis of analyzing 157 rock thin-sections and 90 cast thin-sections.Through research it is considered that the beneficial facies zone of sandstone reservoir bodies in Yanchang Formation is ...