Oil and gas traps in the Rocky Mountain region are classified as anticlinal, permeability, wedge-out, and fault. Ten fields illustrating diverse trap types under these major classifications are discussed and depicted by structural maps and cross sections. The relative commercial importance of each trap type and age of producing reservoirs are compared in a series of maps and bar graphs. Relative importance and trends of discovery methods are also summarized. Conclusions are drawn regarding most productive types of traps and promising methods for their future discovery.

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