Applying multi-scale data to study diagenetic reservoir facies of the Upper Triassic Xujiahe Formation in Dayi Structure，western Sichuan Province
Lin Yu1, Wu Shenghe1, Xu Zhangyou1, Chen Ce2
1 State Key Laboratory of Petroleum Resource & Prospecting，China University of Petroleum(Beijing)，Beijing 102249 2 Geophysical Research Institute，Bureau of Geophysical Prospecting，CNPC，Zhuozhou 072751，Hebei
Abstract：By the full use of cores，well log and seismic data，the types of diagenetic reservoir facies， geological and logging response characteristics of diagenetic reservoir facies，and the diagenetic sequence and horizontal distribution of high-quality diagenetic reservoir facies of the Upper Triassic Xujiahe Formation in Dayi Structure are semiquantitatively-quantitatively researched through several methods，such as slice observation under microscope，core physical analysis，well curve intersection，seismic velocity inversion and so on.The aims of research are to deepen geological theories of low permeability sandstone reservoir and indicate effective development of gas field in this area.The results show that diagenetic reservoir facies of sandstone in the research area can be divided into 4 types，namely，the dissolution pore-micropore-fracture diagenetic reservoir facies with strong fracture，the micropore diagenetic reservoir facies with strong compaction，the tight diagenetic reservoir facies with strong compaction and the tight diagenetic reservoir facies with strong cementation.The curve cross plots of acoustic，density，resistivity and gamma are used to effectively identify different diagenetic reservoir facies.Among 4 types of diagenetic reservoir facies，the dissolution pore-micropore-fracture diagenetic reservoir facies are the high-quality diagenetic reservoir facies，whose porosity is between 3％ and 8％，permeability larger than 0.5×10-3 μm2.The high-quality diagenetic reservoir facies mainly develops on distributary channels and subaqueous distributary channels of the high position of structure belt and belongs to quartz sandstone sufferring strong compaction and fracture.The distribution of them are controlled by sedimentary factors and structure factors.
Lin Yu,Wu Shenghe,Xu Zhangyou et al. Applying multi-scale data to study diagenetic reservoir facies of the Upper Triassic Xujiahe Formation in Dayi Structure，western Sichuan Province[J]. JOPC, 2012, 14(4): 522-532.
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