Recognition and characteristic analysis of the transition boundary for transform marginal basin: A case of Cote d'Ivoire Basin, Africa

Abstract

This paper takes the typical transform passive marginal basin, eg.Cote d'Ivoire Basin as the research object, starting from the transitional edge of the basin, by using comprehensive analysis of various data.We identified two types of transform margins in the marginal basin and summarized respective characteristics; we also compared the differences between two types of transform margins in stratigraphic development, fault systems, volcanic activity, stress fields and different impact on the basin.Through the research of this article, it is believed that a typical transform continental margin basin has two different types of ocean-continent transform margins: transitional margins and transitional discrete margins; There are significant differences between the two types of margins in terms of contact relationship, volcanic activity intensity, and transformation of early strata; The transform continental margin basin structure is controlled by both early faults and transitional faults system.Especially at the transform discrete margins, tensile and strike-slip stresses are overlapped.After multi-stages of structural transformation, the early fault system has dual properties of strike-slip and tension, and multi-stages structural transformation also has a significant impact on oil and gas migration, accumulation and preservation.Early faults near the conversion faults may undergo reversal effect, and the nature of the early faults may change, resulting in compression structures or stratigraphic reversals.

Keywords

• transform marginal basin
• transitional boundary
• volcanic activity
• strike slip effect