开江-梁平海槽区带南段飞仙关组储层特征及控制因素

Characteristics and Major Controlling Factors of Feixianguan Formation in the South of the Kaijiang-Liangping Ocean Trough

通过对开江-梁平海槽区带南段40多口井飞仙关组薄片资料、录井、测井、试油等资料分析,结合岩心观察、扫描电镜等研究,认为飞仙关组储层岩石类型主要为鲕粒白云岩、晶粒白云岩、鲕粒灰岩、泥晶灰岩等;储集空间主要包括粒间(溶)孔、粒内溶孔、晶间(溶)孔、(构造、溶蚀)裂缝等;储层孔隙主要为裂缝型、裂缝-孔隙型、孔隙-裂缝型、孔隙型4种,储层中以4种类型复合产出为特征;储层物性较差,属低孔-低渗类型,裂缝系统发育地区,以低孔高渗为特征;储层发育受到沉积相带展布、白云石化作用、溶蚀作用、构造作用控制,其中,构造作用形成的裂缝系统是海槽区带南段形成规模储层的主要控制因素。

Based on analysis of 40 wells data of thin-section observation,logging,well logging,oil production test and rock core and scan electricitymicroscope observation,The results show that the rocks of reservoir include the oolite dolostone,Crystal-dolostone,oolite limestone,micrite-limestone,atc.The reservoir space include intergranular pore,intragranular pore,intercrystal pore,（tectonic and corrosion）fracture,atc.The reservoir pore include the pore,fracture-pore,pore-fracture,fracture,which compound appear in the reservoir.The reservoir physical features is relatively bad,include the low pore-low permeate,low pore-high permeate appear in the area that develop the fracture.reservoir controlled by the sedimentary facies,dolomitization,solution,tectonic,which commonly control the reservoir distribute.It is very important that the fracture controlled by tectonic is the key factor of scale reservoir in the south of kaijiang-liangping ocean trough.