Cretaceous Lacustrine Algal Stromatolite Reef Characteristics and Controlling Factors, Santos Basin, Brazil

Key words: 
• Santos Basin /
• Cretaceous /
• Algal Stromatolite Reef /
• lacustrine Carbonate /
• Brazil

Abstract: The study of lacustrine carbonate is in the stage of continuous exploration and understanding. In recent years, a large number of lacustrine carbonate reservoirs are found in China and abroad. This makes the study of lacustrine carbonate which learns from the theory of marine carbonate get more concerned and achieved certain results. The Cretaceous lacustrine algal stromatolite reef of Brazil's Santos Basin is a special type of reservoir. This study enriched lacustrine carbonate theory. Through the seismic reflection structure, and properties of three-dimensional seismic sections, core deposit structure, containing material, core and thin section diagenetic porosity and permeability analysis, drilling lithological profile, logging curve reflects the change and cycle characteristics graded phenomenon comprehensive analysis, summed up the main characteristics and controlling factors of the Cretaceous algal stromatolite reef. Algal stromatolite reefs are stacked by stromatolite and bonded by algae, making large areas of cement reef. The algal stromatolite reef has good porosity and permeability. It is a good reservoir. The development and distribution of algal stromatolite reef are mainly controlled by four factors, including sediment supply, the ancient uplift, water changes and algae development. Algal stromatolite reef developed on the eastern uplift belt with saltwater environment,low debris impaction and transgressive systems tract.