The thin interbedded wave impedance Z inversion technology independently developed by Daqing Oilfield has reached the international advanced level after being appraised by the expert committee, breaking the European and American countries' technical monopoly in the field of seismic interpretation for up to 30 years, and earthquakes in thin interbedded reservoirs In terms of forecasting, it surpassed Europe and the United States and created economic benefits of 260 million yuan. This reporter learned from the China Petroleum Technology Appraisal Meeting organized by the China Petroleum Technology Appraisal Center recently.
According to Yu Chengye, the person in charge of the R & D team, the thin interlaminar impedance Z inversion technology is a seismic processing interpretation technology. By accurately interpreting artificial reflection waves, the oil distribution in the earth ’s “vessels†is analyzed just like the earth. Do CT.
Since the 1990s, foreign seismic inversion software has entered the field of seismic exploration in China, monopolizing China's seismic inversion market for a long time. From an economic point of view, a set of French software sells for nearly RMB 4 million, and in the past 30 years it has absorbed more than 1 billion US dollars from the Chinese market; technically, Daqing Oilfield is a typical continental sediment, compared with foreign marine sediments, The reservoir is thin, with poor continuity and complicated lateral changes. For the world-class problem of 2-3 meters thin layer exploration and development, foreign technology is far from meeting the needs of domestic oilfield identification. Therefore, no matter from the perspective of market economy or technological demand, it is necessary to develop Chinese own seismic inversion software.
Since 2006, Daqing researchers have been intensively studying on the Chengye team to reduce the well-seismic matching error from 10% to 15% to 1% to 2% in the existing seismic frequency band, achieving thin interlayer high-precision inversion , And formed the Z inversion reservoir prediction software.
At the beginning of 2016, the field demonstration of the software showed an average increase of 12.2 percentage points compared with the commercial software prediction results, and the sandstone encounter rate reached 91.1%. In 2018, the Z inversion technology was also successfully applied to the prediction of the deep volcanic weathering crust of Well Longping 1. The compliance rate reached 67%, far surpassing similar foreign products. This move caused the imported reservoir prediction products to plunge.
At present, Z inversion technology has been promoted and applied in more than 40 medium and shallow blocks such as Zhaoping 12.
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