Research progress of carbonate rock diagenesis

Abstract

Diagenesis is one of the important genesis of carbonate reservoirs, and it is also an important geological factor for the evaluation and prediction of carbonate reservoirs. First, the research methods of carbonate diagenesis were summarized, and the diagenesis mechanism and latest understandings of dissolution, dolomitization, cementation, neomorphism, silicification, compaction and pressolution were analyzed, and the auxiliary diagenesis factors such as bioturbation, tectonic disruption, hydrocarbon charging and micro-organisms were summarized. The evolution of the diagenetic environment under the control of tectonic-sequence were analyzed, and five sedimentary-diagenetic combinations were classified according to the sedimentary energy and diagenetic properties. Several issues needed to be improved in diagenetic research of carbonate reservoirs, which include: the diagenesis simulation system was different from the real stratigraphic environment; Diagenesis terminology was not standardized, and diagenesis mode was idealized and simplified; Lagoon, deep water and cold water and other unconventional carbonate diagenesis were in a low research degree; The double-edged influence of diagenesis on reservoirs and the quantitative research on reservoir reforms are insufficient. The development trend of carbonate diagenesis research include: by combining the history of stratum burial, the experimental simulation method will gradually move towards the real burial environment, and the diagenesis simulation software will continue to achieve modular integration and intelligence; The diagenesis model will be more refined and targeted, and the diagenesis can achieve quantitative research on the transformation of the reservoir; Research on the diagenesis mechanism of unconventional carbonate rocks will be more complete.

Keywords

• diagenesis
• carbonate rock
• dissolution
• dolomitization
• microbial rock