期刊
ACTA GEODAETICA ET GEOPHYSICA
卷 51, 期 4, 页码 723-744出版社
SPRINGER
DOI: 10.1007/s40328-015-0155-z
关键词
Post-stack attributes; Statistical analysis; Sawan gas field; Gas layer thickness; Gas bearing sand zones
资金
- National High-Tech R&D Program of China [2013AA064201]
- Geo-detection lab, China University of Geosciences, Beijing
Sandstone intervals of the Lower Goru Formation of the Cretaceous age are proven reservoir intervals in the middle Indus Basin, Pakistan. However, based on seismic data interpretation, it is difficult to differentiate payable gas sand from non-payable gas sand. Various types of post-stacks seismic attributes are extracted and analyzed to differentiate payable gas sand from non-payable. The analysis reveals that average instantaneous frequency, peak spectral frequency, average instantaneous phase and sweetness seem to be more effective attributes along with energy half time. Sweetness attribute map shows two sweet spot below the targeted window which indicate to the presence of gas play. Statistical analysis is also carried out to find the associations between seismic attributes and thickness of gas layer values. Cross plots of these attributes were quantified through regression analysis. A good correlation with regression coefficient (R-2) > 0.78 is found between seismic attributes and gas layer thickness except average instantaneous phase attribute, which lays the foundation for predicting the thickness of gas reservoir.
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