Abstract:

Based on the analysis of the regional tectonic evolution and sedimentary filling characteristics in Bolivia, the differences in geological conditions of hydrocarbon accumulation in the basin, such as source rocks, reservoirs and cap rock are studied, and the exploration potential of basins is analyzed. The three major basins, Chaco, Beni and Madre De Dios basins in Bolivia, are superimposed basins developed on the basis of the Precambrian basement, and the basins are sequentially filled with the marine sedimentary sequence of the Paleo-generation craton margin, the Triassic Cretaceous rift marine facies-marine-continental transitional sedimentary sequence and foreland continental sedimentary sequence since Late Cretaceous. Comprehensive analysis of geological conditions of hydrocarbon accumulation shows Devonian main source rocks develope in 3 basins, Devonian-Carboniferous and Cretaceous sandstones are reservoirs, and Paleozoic carbonate rock and Paleogene mudstone are multiple sets of caprocks. Mature source rocks are mainly distributed in the thrust belt and the foredeep region, and the oil and gas must be migrated vertically and laterally so as to accumulate, which has the characteristics of late hydrocarbon generation and late accumulation. Low amplitude structural traps and stratigraphic traps in foredeep and slope areas of Madre De Dios basin and thrust fold belt of tectonic traps in Chaco and Beni basins are the main exploration targets.

Key words: Chaco basin, Madre de Dios basin, Beni basin, resource potential, Bolivia