【摘要】 四川盆地北部阆中—南部(地名)区块处于川中隆起与川北坳陷的斜坡部位,具有优越的成藏条件。运用钻井岩心观察、岩屑描述、铸体薄片观察、压汞分析、地球物理资料解释等分析手段,对研究区长兴组储层特征进行了研究。结果表明,储层发育有利的沉积相带为开阔台地相台内滩亚相及台缘礁滩沉积,储层岩石类型以生物灰岩、砂屑灰岩、泥晶灰岩为主;储层的储集空间类型多样,孔、洞、缝均有,粒间孔、体腔孔为研究区储层主要的孔隙类型;喉道普遍狭窄,喉道类型主要是微喉,少量细喉;平均孔隙度为1.16%,平均渗透率为0.5415×10-3μm2,属特低孔特低渗致密储层;长兴组储层呈现"低频、弱振幅、杂乱反射"的地震响应特征,测井信息反映含气储层具有"两低一高"的特征。更多还原

【Abstract】 Located in the ramp region between the Central Sichuan uplift and Northern Sichuan depression,the Langzhong-Nanbu area possesses superior accumulation conditions.The reservoir characteristics of the Changxing Formation in the study area were studied by means of core observation,debris description,microscopic observation of cast thin sections,analysis of mercury intrusion and geophysical interpretation.The results show that favorable facies belts for the development of reservoirs are interbank area and bank in the platform as well as platform marginal reef flat.The rocks are dominated by bioherm limestone limestone,calcarenite and micritic limestone.In various kinds of reservoir space such as pores,holes and seams,the pores are mainly intergranular pores and dorsal foramen.In massive micro-throats and little fine throats,most of the throats are confined.As the average porosity is 1.16% and the average permeability is 0.5415×10-3μm2,the reservoirs are classified as extra low-porosity and extra low-permeability reservoirs.Seismic response displays the features of low frequency,weak amplitude and chaotic seismic reflection.The well-logs for the gas reservoirs exhibit the properties of high neutron porosity,low density and low resistance.更多还原