建南气田长兴组生物滩气藏储层特征及评价

通过岩心观察、铸体薄片、物性、压汞等资料的分析,结合测井及地震资料,对研究区长兴组沉积相带展布与生物滩储层发育特征进行了研究。结果表明:长兴组生物滩储层主要发育于建南气田南高点台缘生物滩;储层岩性主要为白云岩、(含)云质灰岩、生屑灰岩;储集空间以晶间孔、晶间溶孔、粒间溶孔为主。储层类型为低孔-低渗、特低孔-低渗储层,综合评价为Ⅲ、IV类储层。

On Gas Reservoir Features in Organic Bank of Changxing Formation in Jiannan Gas Field

On the basis of analysis of the information concerning core observation, casting slice, physical property and mercury penetration and combining with logging and seismic data, this paper has studied distribution of sedimentary fades belt in Changxing formation and features of reservoir development in organic bank. The research shows that the reservoir is majorly developed in platform--margin organic bank at high spot in southern Jiannan Gas Field, that its lithology consists mostly of dolomite, containing dolomitic limestone and bioclast limestone and that inter--crystal pore, inter--crystal dissolved pore and intergranular cavity serve as major reservoir space. Reservoir types are low-- porosity and low--permeability type and ultra low--porosity and low--permeability type, which are classified as Level 3 and Level 4 reservoirs respectively by means of comprehensive evaluation.