Geological and geophysical characteristics of marginal deposits at Dragon field, block 09-1, Cuulong basin, continental shelf of South Vietnam

Abstract

The article includes the geological and geophysical characteristics of Dragon field on the block 09-1 of the continental shelf of Vietnam. The analysis of the porosity and permeability properties of developed deposits is considered. According to the geological and geophysical characteristics it has been con-cluded to refer deposits to marginal. By analogy with the deposits discovered at the exploration and development stages, the neighboring deposits, discovered in 2018-2021, also referred to marginal. The discovery and development of White Tiger offshore field made a major impact on geological exploration and study of geological features of South Vietnam shelf. Cuulong basin tectonics, structural-tectonic features of the basement and geology of Dragon field have been analyzed. The initial data analysis is carried out to determine the reservoir and make log interpretation. Commercial nomenclature of developed zone / horizons for sediments, clastic and basement rocks are presented. The authors identified, proposed and discovered new deposit, geological structures and hydrocarbon deposits within the Dragon area. Com-parative assessment of recoverable reserves depletion and their distribution by the field is given. Platform features and placement on deposits are speci-fied. It is offered a hydrocarbon deposit types classification according to the geological and geophysical characteristics of the developed field. A block di-agram has been prepared, taking into account the geological characteristics and economic indicators. New marginal areas within Dragon field are identified by analogy with the discovered deposits. Based on the results of 2018-2021works, the additional exploration, drilling and well testing have been per-formed on the prospects. Commercial oil-and-gas content of the discovered reservoirs are proved, additional exploration and production activities are planned. The perspectives are evaluated for applying similar methods to the neighboring fields, blocks and areas.