鄂尔多斯盆地志丹探区长2+3油藏类型对比及评价

Comparison and evaluation of reservoir type of long 23 reservoir in Zhidan exploration area of Ordos Basin

鄂尔多斯盆地志丹探区长2+3油藏差异类型较大。通过构造、沉积和油气藏对比剖面研究,结果表明:1)志丹探区长2+3油藏主要类型有岩性圈闭油藏、构造-岩性圈闭油藏、岩性-构造圈闭油藏;2)志丹探区典型岩性油藏分布在长23、长33层位,产量较低;构造-岩性油藏主要分布在长21、长23层位,产量较低;岩性-构造油藏主要分布在长21,主要受构造控制,产量较高;3)受构造、岩性圈闭控制因素影响,构造控制油藏产能相对大于岩性控制油。

The reservoir types of Chang2+3 in Zhidan exploration area of Ordos Basin are quite different. The results show that: 1) main types of reservoir in Chang2 +3 of Zhidan exploration area include lithologic trap reservoir, structure-lithologic trap reservoir, and lithological-tectonic trap reservoir. 2) typical lithologic reservoirs in Zhidan exploration area are distributed in Chang23 and Chang33 strata, with low production. Structure-lithologic reservoirs are mainly distributed in Chang21 and Chang23 strata, with low production. Lithology-structure reservoirs are mainly distributed in Chang21, which are mainly controlled by structure and have high yield. 3) affected by structural and lithologic trap control factors, the productivity of structure-controlled reservoir is relatively higher than that of lithologically controlled oil.