塔中隆起北斜坡鹰山组沉积微相及有利储集层展布

通过岩心、岩石薄片、成像测井、野外露头等资料分析，在塔中隆起北斜坡中部下奥陶统鹰山组内部识别出9种沉积微相，组合成4种沉积微相序列。鹰山组内部发育4种储集空间类型，以裂缝-溶孔型储集空间为主，其次为小型溶孔型，裂缝型和溶洞型所占比例相对较少。高能沉积微相序列是有利储集层发育的基础，易发育小型溶孔型和裂缝-溶孔型储集层，几种类型的储集层相互叠加，形成鹰山组优质储集层。低能沉积微相序列多作为原状地层或隔层出现，但在局部也可以发育少量的裂缝和溶孔，形成小规模的裂缝型及裂缝-溶孔型有利储集层。

Sedimentary Microfacies and Favorable Reservoir Distribution of Yingshan Formation in North Slope of Tazhong Uplift,Tarim Basin

According to analyses of cores, thin?sections, imaging logs and outcrops information, nine microfacies and classified as four microfacies sequences within the Yingshan formation of Late Ordovician in central north slope of Tazhong uplift in Tarim basin were recognized. There existed four types of reservoir spaces in Yingshan formation, which are dominated by fracture?vugular pores, followed by small vugular pores, seldom fractured and vuggy spaces. The result shows that the high energy microfacies sequence is the primitive materials for the favorable reservoirs, easily forms small vugular pore and fracture?vugular types of reservoirs, and these several types of reservoirs overlap followed by shaping the high quality reservoir. The low energy microfacies sequence occur as undisturbed formation or barriers, but it could produce local bits of fractures and vugular/dissolution pores, which may form relatively small?scale fractured and fracture?vugular pore types of reservoirs in this area