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The Shallow-Water Delta Deposit and Exploration Significance in Huanghekou Depression

As a new kind of deposition system, the shallow-water delta deposit is accepted increasingly by exploration workers in Bohai oil field. In the oil-gas exploration process, more and more evidence about the existence of shallow-water delta was discovered, such as palaeophyte, mudstone characteristic, log response and so on. From the perspective of sequence stratigraphy, the author of this article analyze the causes of shallow-water delta and think that the water-depth change is the major factor that control the throughgoing of shallow-water deltaic sands body; And summarizes the unique characteristic of shallow-water delta which is different to the common delta deposit. Compared to the traditional fluvial sediments, the deposition system of shallow-water delta has better combination of reservoir and cap and superior condition of oil and gas accumulation, and provide more reliable safeguard to shallow layer oil-gas exploration, especially to lithologic reservoirs exploration.