The Suizhong 36-1 Oil Field, Bohai Gulf, Offshore China: Reservoir Delineation by Geophysical Methods
John B. Gustavson, Xin Shi Gang, 1992. "The Suizhong 36-1 Oil Field, Bohai Gulf, Offshore China: Reservoir Delineation by Geophysical Methods", Giant Oil and Gas Fields of the Decade 1978-1988, Michel T. Halbouty
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The Suizhong 36-1 oil field was discovered by Bohai Oil Corporation, a subsidiary of CNOOC, in 1987 in the Bohai Gulf, Liaodong Bay. The structure consists of Oligocene fluviodeltaic and lacustrine sandstones that contain heavy oil in a combination structural-stratigraphic trap. Seismic data were reprocessed and interpreted. Synthetic seismograms were used for correlation and wavelet processing of the seismic data. Seismic-petrophysical analyses were carried out to relate the measurable seismic parameters to the subsurface rock and fluid parameters.
Interpretations were carried out on a GeoQuest workstation and were iterated several times to obtain a consistent match with the wells. Seismic attribute generation and analysis were used primarily to reveal patterns associated with the depositional environments. The approximate inversion or pseudoinversion method was applied to the seismic data to obtain the subsurface acoustic impedance distribution that was the basis for the reservoir parameter estimates.
For estimation of hydrocarbon reserves, first the values of acoustic impedance were converted into estimates of porosity using the relationships derived from seismic-petrophysical analysis, and then the porosity distribution was transformed into maps of net reservoir thickness, permeability, and oil saturation. The results suggest that accurate predictions of oil in place are possible with this methodology.
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The success of Memoir 14 and the worldwide interest shown for data on giant fields prompted AAPG to schedule a symposium on giant fields at the end of each subsequent decade. The 1968-78 symposium was held in Houston, Texas, April 1-4, 1979, and the papers were published in AAPG Memoir 30, December 1980.
The Stavanger Conference "Giant Oil and Gas Fields of the Decade: 1978-1988" was held in Stavanger, Norway, September 9-12, 1990, and is a continuation of the Giants of the Decade series.
Scientific studies and projections of future world energy demand indicate that although alternative-energy fuel sources must be actively pursued and developed, there also must be adequate petroleum supplies to bridge the gap. For the international petroleum industry, the years covered by this conference, 1978-88, were complex. They were years of boom and bust. The world's energy consciousness was boosted sharply by the effects of the 1979 Iranian revolution and the resulting embargo, which sent world oil prices to record heights. Global petroleum exploration soon surged, leading to the industry's all-time drilling high in 1981. Then came the oil price collapse in 1985, and the following years were characterized by falling oil prices and drastic budget cuts for exploration and development.
Although exploration dropped sharply during the latter part of the decade, there was a steady flow of giant oil and gas field discoveries. Using the giant field designation criteria of 500 million bbl of oil recoverable for fields in Asiatic Russia, North Africa, and the Middle East,