Study Of Post-Project Analysis Of Environmental Impact On Offshore Petroleum Exploiting Project

Using the recent study tools and results of Post-Project Analysis of environmental impact at home and abroad for reference, this paper takes the Offshore Oil Field of Beibu Gulf as an example to discuss the impact from offshore petroleum exploiting project on marine environment and the effect of environmental protection measures against pollution. The collected previous data and field survey data are combined with analysis at lab in this case study. This paper primarily probes into the ways of Post-Project Analysis of environmental impact on offshore petroleum exploiting project and gives Post-Project Analysis of environmental impact on the Offshore Oil Field of Beibu Gulf. This case study enriches the content of EIA and provides the technology support for the Post-Project Analysis of environmental impact on offshore exploiting project.This case study results shows up:1. The exploiting activity of Offshore Oil Field of Beibu Gulf has certain impact on the surroundings waters, obviously on the sediments and benthos within 500 m radius around the oil field. The mixing area around the platform has been affected seriously by the exploiting activity and then the environmental quality is evidently worse than the outer waters.2. The water quality surrounding the oil field is high; the single standard index Q_ij of each assessed parameter is less than 0.5 and accords with the fourth category of Sea Water Quality Standard. The outer water quality primarily accords with the first category of Sea Water Quality Standard. The single standard index Q_ij of dissolved oxygen at 15 location points and of oils at three location points are larger than 1.0, the excessive percentage counts 88% and 18% respectively.3. The various pollutants content in the outer sediment do not go beyond the first category of Marine Sediment Quality; around W12-1 platform, the mixing area within 500 m radius is affected by exploiting operation evidently and the various pollutants in sediment have been detected to be in high level. Thereinto, the single standard index Q_ij of sulfide amounts to 3.93 at B23, 2.93 times higher than the third category of Marine Sediment Quality, while the variety of pollutants level, such as mercury, arsenic and lead, have been found to be higher than the first category of Marine Sediment Quality. The various pollutants averages in the mixing area of other platforms are almost the same as the outer waters, that is to say, the single standard index Q_ij is less than one.4. The amount of hydrocarbon oxidation bacteria has been detected to be less in the outer waters than in the mixing area; and in the phytoplankton species composition there is no evident distinctness found between the outer waters and the mixing area. The bio-diversity indexes are larger than three, with high evenness and the species distributed evenly. The biotope for phytoplankton keeps all right. The most of zooplankton belongs in tropic, sub-tropic and nearshore species with some high temperature, hyaline and upwelling species. The zooplankton bio-diversity indexes all go beyond three, the community structure keeps stable and the biotope for zooplankton is excellent.5. The exploiting activity of Offshore Oil Field of Beibu Gulf has certain impact on the benthos...