Sweet spot Identification of shale gas from 2D modeling at Sinphuhorm field, onshore Thailand
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Abstract
This research aimed to enhance the understanding and assessment of the shale gas potential of the Huai Hin Lat Formation in the Sinphuhorm Field, located in the Khorat Basin, northeastern onshore Thailand. The Huai Hin Lat Formation is recognized as a significant rock source in this region deposited in rifted basin during Triassic. To achieve the research objectives, geological, geophysical, and geochemical characteristic interpretations were integrated using published reports, well data and seismic data. The results of one- and two-dimensional petroleum system models can identify the shale gas sweet spot areas and estimate the potential gas-in-place resources of the Huai Hin Lat Formation. The geological analysis was derived from existing well data, including the final well report, mudlogging data and wireline logging data. These data facilitated a comprehensive understanding of the lithological characteristics and depositional environment in terms of both vertical and lateral dimensions. A composite seismic line was selected for geophysical analysis and two-dimensional (2D) petroleum system modeling. This seismic line was extracted from the crest structure of the Sinphuhorm field, extending from the production wells in the east to the basin center in the western part of the field. Seismic facies analysis was applied to identify lithological variations in the seismic profile. Results from the 2D petroleum system modeling indicated that the Huai Hin Lat Formation in the study area is in the late stage of the dry gas generation window at the present-day temperature model giving a high hydrocarbon transformation ratio. However, despite favorable rock properties suitable for shale gas production through hydraulic fracturing, the Formation exhibited lower potential for unconventional resources due to less promising hydrocarbon generation, poor hydrocarbon qualification, a high degree of maturation, and restricted hydrocarbon migration.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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