1. An application of seismic attributes analysis for mapping of gas bearing sand zones in the sawan gas field, Pakistan
- Author
-
Cheng Lifang, Fang Yuan, Liu Xueqing, Perveiz Khalid, Wang Yanchun, and Tahir Azeem
- Subjects
Bearing (mechanical) ,010504 meteorology & atmospheric sciences ,Window (geology) ,Geology ,Regression analysis ,Soil science ,Building and Construction ,Structural basin ,010502 geochemistry & geophysics ,01 natural sciences ,Instantaneous phase ,law.invention ,Natural gas field ,Geophysics ,law ,Linear regression ,Geotechnical engineering ,Statistical analysis ,0105 earth and related environmental sciences - Abstract
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 (R2) > 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.
- Published
- 2015
- Full Text
- View/download PDF