摘要
四川盆地震旦系灯影组(Z2dn)白云岩地层较致密,非均质性和各向异性强,导致储层有效性评价比较困难。结合岩心资料和成像测井资料,研究了川中地区Z2dn不同孔隙类型的储层在成像测井资料孔隙度分布谱上的响应特征。研究表明,不同孔隙类型的储层在成像测井资料孔隙度分布谱上的响应特征不同,地层中主要发育原生孔隙时,成像孔隙度分布谱上显示为靠左的单峰,峰形尖细且窄;地层中原生孔隙与次生孔隙都发育时,成像孔隙度分布谱上显示为双峰,左峰表达原生孔隙,右峰表达次生孔隙;地层中主要发育次生孔隙时,成像孔隙度分布谱上显示为靠右的单峰,峰形较宽且拖尾现象明显;据此可定性评价储层有效性。
It was difficult to evaluate dolomite reservoirs in Dengying Formation of Sinian system in Sichuan Basin due to its compactibility and anisotropy.Spectral response features of reservoirs with different pore types of Dengying Formation(Z 2 dn) in Sinian system of the central Sichuan Area were studied by using data of cores and FMI.The research demonstrates that different types of pores have different responses on the porosity spectrum,when the primary pores are well developed in the formation,the corresponding porosity spectrum shows a single narrow peak on the left;when the secondary pores are developed,there is a single and wide tailing peak on the right of the porosity spectrum;when both the primary pore and secondary pore are developed,single narrow peak is on the left and wide tailing peak is on the right on the porosity spectrum.The porosity spectrum is confirmed to be an effective way to evaluate the validity of reservoir in the study.
出处
《石油天然气学报》
CAS
CSCD
2013年第4期83-88,167,共6页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2011ZX05020-008-004)
