摘要
四川盆地震旦系储集层内的原生孔隙经过多期亮晶白云石胶结后基本消失 ,现今储集空间以次生成因的孔、洞、缝占绝对优势 ,这些孔隙经过多期化学沉淀物的充填后极大缩小 (面孔率仅为 2 %～ 1 3% )。根据对充填物成分、晶体形态、形成顺序和地球化学等特征分析 ,可将次生孔隙内的化学充填物分为白云石和石英两类、共五期 ,它们分别形成于不同的地质时期和不同的成岩环境之中 ,其中白云石期次多、含量丰富 ,石英较少。这些沉淀物的充填作用是储集层内次生孔隙难于保存的主要原因 ,残存的次生孔隙是储集层内的主要储集空间。图 1表
After multiple phase dolosparite cementation, the primary pores in the Sinian reservoir, Sichuan basin basically disappeared, the present pore spaces are dominated by secondary pores, vugs and fractures, which largely shrank after filling of multiple phase chemicals. According to their components, crystal shape, order of formation and geochemical characteristics, the chemical fillings can be grouped into two major types of dolomite and quartz, and five phases, they formed in different time and different diagenetic environment, with dominant dolomite, multiple phases and less quartz. The filling of the cements is the main reason that the secondary pore spaces within the reservoirs are hardly preserved, and the residual secondary pores are the main accumulation pore space in the reservoirs.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2001年第4期41-43,共3页
Petroleum Exploration and Development
基金
"油气藏地质及开发工程国家重点实验室"资助项目 (编号 :PLN990 3)研究成果
