鄂尔多斯盆地陇东地区三叠系延长组长6—长8储层评价及有利区带预测

Reservoir evaluation and favorable area prospecting in Chang 6 to Chang 8 of the Triassic period at Longdong region in Eerduois Basin

针对鄂尔多斯盆地陇东地区勘探开发前景,为寻找有利储层,对其三叠系延长组长6—长8储层的岩相古地理及沉积相特征、岩石学特征、孔隙类型及物性特征进行了深入研究,并讨论了物性与砂体成因的关系。在此基础上,将储层划分为四类,该区没有Ⅰ类好储层,Ⅱ类中等储层仅占9.4％,Ⅲ类差储层占51.1％,Ⅳ类非储层占37.4％,以Ⅲ类储层为主;采用Ⅱ、Ⅲ类作为有效储集岩,预测了六个有利勘探区。

In order to seek the favorable reservoir, thorough research on its lithofacies paleographic, sedimentary faci-es, petrologic property, pore type and petrophysical property is carried out in Chang 6 to Chang 8 reservoirs of the Triassic period according to prospects for oil and gas exploration and development at Longdong region in Eerduois Basin. And the relation between petrophysical property and sandbody genesis is discussed. On the basis of that, the reservoirs are divided into four types. This region lacks Type I good reservoirs, Type -Ⅱ mid -reservoirs are merely composed of 9.4% , Type Ⅲpoor reservoirs are composed of 51. 1% , Type Ⅳ non-reservoirs are composed of 37. 4% ; taking Type M as major. Type Ⅱ and Type Ⅱ are taking as effective reservoirs, we prospected six favorable areas.