The geology and exploration histories of the Biyang, Damintun, Changwei, and Baise depressions, each covering an area less than 1000 km2, reveal four major characteristics of hydrocarbon exploration in small depressions: (1) thick sediments and source rocks, (2) graben or wedge-shaped structures, (3) predominantly nonanticline reservoirs, and (4) high-wax crude oil. In view of the discovery of Shuanghe and other significant fields in these small depressions, the results of such studies may have important implications for oil explorations in other small depressions.

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