The nonmarine sequence stratigraphy and its implications for oil and gas prospecting and exploration

The sequence boundary, sequence hierarchy and sequence bounding surface in the non-marine strata are discussed in this paper. Two sequence models are presented for two types of basin:fault and depression basins. The relationship between systems tracts and oil and gas traps indicates that there is a genetic affiliation between the source-reservoir-caprock associations and systems tracts in stratigraphic sequences. For example, the stati-graphic trapped oil and gas deposits may occur in the alluvial systems of the lake trans-gressive systems tract; the sand-mud intercalations generated in the retrogradation and progradation in the highstand systems tract may be the sites for oll generation, and the deltas and fan deltaic sediments characteristic of the lowstand systems tract may serve as the best oil and gas reservoirs. It follows that the nonmarine sequence stratigraphy has im-portant implications for the prospecting and exploration of oil and gas deposits.