Sedimentary Characteristics and Their Relationship with Oil and Gas of Lacustrine Coastal Beach Bars of the TMSG Basin in Mongolia

In order to study the sedimentary characteristics of lacustrine beach bars and their relationship with oil and gas, based on the theory of lacustrine sedimentation, combined with the sedimentary characteristics of the TMSG basin in Mongolia, and referring to the characteristics of the modern Beier Lake beach bar sedimentary system, the sedimentary characteristics and their relationship with oil and gas of the lacustrine beach bars in the TMSG basin in Mongolia were analyzed through field investigations, core observations, and other methods. Research suggests that there are six types of shoreline beach bars in the modern Beier Lake shoreline zone: forward convex beach cusps, forward cuspidal beach cusps, oblique short beach cusps, and oblique long beach cusps, internal rhythm topography on shoreline beach bar and crescentic bar. The lacustrine sedimentation in the TMSG Basin is also developed. There is a certain contrast between the sedimentary characteristics of the modern Beier Lake lacustrine facies and the TMSG basin in Mongolia. This provides further theoretical guidance for the study on the distribution rules and control factors of lacustrine beach bars in the TMSG Basin of Mongolia.