摘要
利用三维地震资料,采用属性分析、波阻抗反演及厚度预测等技术对建南地区开展储层预测工作。建南地区下三叠统飞仙关组厚400～550m,划分为四个段,其中飞三段是主力产气层系,储层类型以孔隙型为主,局部发育孔隙-裂缝型,属于特低孔、(特)低渗储层。飞三段的沉积环境主要为开阔台地、台地边缘浅滩及台缘斜坡相带。研究区内普遍发育鲕滩,但是鲕滩不一定发育储层;岩性以泥晶灰岩、砂屑灰岩、鲕灰岩为主;储集岩类中,按白云岩、颗粒灰岩、泥(粉)晶灰岩的岩性序列,物性逐渐变差,孔隙度与白云石含量呈正相关关系。飞三段储层的双侧向电阻率为高电阻率背景下的相对低值,自然伽马为低值,与上下致密灰岩相比,具有声波时差大、密度小、中子孔隙度大等特征。储层的测井响应特征及地震响应特征分析表明,飞四段底部存在的低阻抗岩层是解决工区南、北鲕滩储层预测的关键。
Lower Triassic Feixianguan Formation is 400~550m thick in Jiannan area.It can be divided into four members,among which the 3rd member（T1 f3） is the main gas pay bed.The T1 f3 reservoir is porous or porous-fractured locally but is the one with very low porosity and low permeability.The sedimentation environment of it commonly is the open platform and platform marginal shoal and slope facies.It is commonly composed of micritic limestone,calcarenite and oolite.The reservoir loggings shows low resistivity values of LLd and LLs corresponding to the background of high resistivity value,low values of GR,high values of AC,low values of DEN,and high value of CNL.Based on the analysis of reservoir logging response characteristics and seismic response characteristics,it is indicated that a set of low-impedance layers exists at the bottom of the 4th member（T1 f4）,which will be the key to solve the prediction of beach-facies oolite reservoir distributed in the south and north parts of this area.
出处
《海相油气地质》
2011年第2期9-17,共9页
Marine Origin Petroleum Geology
关键词
碳酸盐岩储层
地震储层
储层预测
飞仙关组
建南地区
Lower Triassic
Feixianguan Formation
Carbonate reservoir
Seismic reservoir
Seismic attribute
Reservoir prediction
Sichuan Basin
