川东北元坝地区自流井组珍珠冲段致密储层特征与主控因素

综合利用铸体薄片鉴定、物性分析等分析手段,对川东北元坝地区自流井组珍珠冲段储层特征、沉积和成岩作用进行了研究.结果表明,自流井组珍珠冲段主要发育砾岩和砂岩两套储层,砾岩储层的储集空间以裂缝为主,见少量微孔,孔隙度、渗透率值极低,为典型孔隙-裂缝型储层.砂岩储层的储集空间以原生粒间孔、粒间溶孔、粒内溶孔为主夹少量微裂缝,...

Compact reservoir characteristics and main controlling factors of Ziliujing formation Zhengzhuchong segment in Yuanba area northeast of Sichuan

By using comprehensively analytical methods of casting thin sections identification,physical property and so on,the reservoir characteristics,sedimentation and diagenesis of Ziliujing formation Zhengzhuchong segment in Yuanba area northeast of Sichuan have been studied.The result indicates that: Ziliujing formation Zhengzhuchong segment developed into two sets of reservoir as conglomerate and sandstone.The the conglomerate reservoir′s reservoir space is mainly fracture,with fewer microporous and extremely low porosity and permeability,it is typical pore-fracture reservoir.Sandstone reservoir′s reservoir space is mainly the primary intergranular hole,the intergranular dissolution pore,intra granular dissoluted pore with few micro fracture,the average porosity is 6%,average permeability is 0.1×10(-3) μm2,it is pore reservoir.The development of Ziliujing formation Zhengzhuchong segment is affected obviously by sedimentation and diagenesis,which is mainly manifests in the following several aspects: the advantageous sedimentary facies belt decide different type reservoir′s plane distribution,the green mudstone′s existence promoted the sandstone reservoir growth degree,the corrosion is the important factor to form the good reservoir and the structure breakage is the key factor to form the good reservoir.