Features of amplitude anomalies according to the seismic data on the northern side of the Dnipro-Donetsk Depression
DOI:
https://doi.org/10.24028/gj.v47i1.311560Keywords:
seismic exploration, angular seismic images, AVO analysis, AVO attributes, seismic hydrocarbons indicatorsAbstract
The work continues series of articles on using seismic hydrocarbon indicators to detect natural gas traps in licensed areas within the northern side of the Dnipro-Donetsk Depression. The article presents some results for gas traps in the Olhivske and Makiivske gas condensate fields. A 3D seismic survey was conducted. Angular seismic images were used to calculate the distributions of seismic hydrocarbon indicators. They were constructed by direct conversion of seismograms of common sources into seismic images of the geological environment using the Kirchhoff method. Five seismic hydrocarbon indicators were identified that are appropriate for searching for gas traps in the fields of the northern side of the Dnipro-Donetsk Depression with a similar geological structure. Seismic exploration data were used to plot the distribution of signs of hydrocarbon seismic indicator anomalies (their position relative to the top, the bottom of the gas layer, or to the gas layer itself and its dependence on the polarity of the seismic data). The studies were conducted using Schlumberger technologies and software. The results were taken into account in the recommendations for drilling wells. The commercial gas reserves confined to the detected amplitude anomalies are confirmed by drilling and well studies. The results are useful for scientists and geologists of oil and gas companies that use hydrocarbon seismic indicators to detect gas traps in this region. Using the implemented approaches to detecting hydrocarbon traps will contribute to improving drilling and increasing the volume of explored gas reserves in Ukraine.
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