鄂尔多斯盆地富县地区延长组长6、长7储层特征及有利区预测

本文在分析研究区大量钻井、测井资料基础上，结合岩心观察、铸体薄片鉴定、扫描电镜等测试分析，展开富县地区延长组长6和长7储层特征的研究，对研究区进行综合评价并预测储层有利区。研究结果表明：长6、长7储层岩性以岩屑长石砂岩和长石岩屑砂岩为主；孔隙类型以残余粒间孔、溶蚀粒间孔为主，其次为组合型孔隙结构；孔隙度与渗透率值较低，属于特低孔、超低渗孔隙型储层。根据储层分布特征将研究区储层划分为3类，长6、长7以Ⅱ_b类和Ⅲ_a类储层为主。综合评价预测长6储层有4个有利区，长7储层有5个有利区。数据表明：长6、长7储层油气分布面积大且相对聚集，因此该研究区具有广阔的勘探开发价值。研究结果可为油田待开发区域的有效开采提供依据。

Characteristics of Chang 6 and Chang 7 reservoirs in Yanchang Formation in Fuxian area, Ordos Basin and prediction of favorable areas

Using a large number of drilling, logging and research literature data, combined with core observation, casting thin section identification, scanning electron microscopy and other test analysis, the research on the reservoir characteristics of Chang 6 and Chang 7 in Yanchang Formation in Fuxian area was carried out. Comprehensive evaluation of the study area and prediction of favorable reservoir areas. The research results show that the Chang 6 and Chang 7 reservoirs are mainly composed of lithic feldspar sandstone and feldspar lithic sandstone, and the pore types are mainly residual intergranular pores and dissolved intergranular pores, followed by combined pore structure; It belongs to the ultra-low porosity and ultra-low permeability pore-type reservoir. The reservoirs in the study area are divided into three types. According to the reservoir distribution characteristics, Chang 6 and Chang 7 are mainly type II_b and III_a reservoirs. Comprehensive evaluation predicts that there are four favorable areas in Chang 6 reservoir, and Chang 7 reservoir. There are 5 favorable zones. The data show that the Chang 6 and Chang 7 reservoirs have large oil and gas distribution areas and are relatively concentrated, so the study area has a broad exploration and development value, and provides a basis for the effective exploitation of the oilfield to be developed.