Methods for diagenetic facies research on carbonate rocks and its application: Example from oolitic beach reservoir of the Feixianguan Formation in the northern margin of Yangtze block

Diagenetic facies is an important approach to study diagenesis distributing. It is integrative representation of all kinds of diageneses occurring in definite diagenetic environment. Based on the detailed study of diagenesis and diagenetic environment, eight types of diagenetic facies and seven types of diagenetic subfacies are divided in Feixianguan Formation, northern margin of the Yangtze block. All kinds of identification labels are summarized. The authors discussed the relationship between diagenetic facies and sedimentary facies, log facies, seismic facies, as well as the diagenetic distributing characteristic on spot, line and plane. Favorable exploration targets and belts were predicted. The effective research approach of diagenetic facies summarized by this paper is worth popularizing in oil and gas exploration.