Govern of Abnormal Pressure on Reservoir Diagenesis

doi:10. 3863/j. issn. 1674 – 5086. 2013. 03. 005

Abstract

Abstract:

Taking the Fu 3 interval reservoir in Zhangjiaduo Oilfield as an example，based on mechanism research of abnormal
pressure，we study the impacts of overpressure on diagenesis with the cast thin section，XRD and SEM. Results of this study
demonstrates the following：（1）Abnormal pressure caused by under compaction can slow the rate of compaction，so framework
grains of deeply buried reservoirs show point to line contact and intergranular pores are still main pores.（2）Illitization of
smectite can be slowed by reducing mass transport by convection because of closed diagenetic system relatively caused by
under compaction.（3）Quartz overgrowth and ferroan calcite cement are restrained by overpressures and closed diagenetic
system. There is a good relationship between pressure coefficient and reservoir physical property. So，high quality reservoirs
can be predicted by petrology and pressure analysis.

Key words: abnormal pressure, under compaction, diagenesis, Funing Formation, Zhangjiaduo Oilfield

Liu di1, Ding Xiaoqi1，2, Han Meimei3. Govern of Abnormal Pressure on Reservoir Diagenesis[J]. 西南石油大学学报(自然科学版), DOI: 10. 3863/j. issn. 1674 – 5086. 2013. 03. 005.

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