Processing of high resolution seismic data for drilling rig site surveys in the Gulf of Thailand | |
| Author | Supakorn Nunthakungwan |
| Call Number | AIT Thesis no.GE-09-10 |
| Subject(s) | Seismic reflection method--Data processing Oil well drilling rigs--Thailand, Gulf of |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geosystem Exploration and Petroleum Geoengineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-09-10 |
| Abstract | Seismic exploration is an important technique for oil and gas industry which is applied to several purposes such as searching hydrocarbon accumulation or migration, or identification shallow geological features that may be hazardous to the drilling rig of exploration and production. For the shallow seismic exploration used high frequency to get high-resolution results. Nowadays, the high-resolution seismic survey (HRSS) has two types as follows: (1) single channel HRSS and (2) multi channel HRSS. Multi channel HRSS had the typical processing sequence already, but single channel does not have the typical processing sequence. This study is to propose an optimal processing sequence of single channel high-resolution seismic data for to improve ability of the method in mapping the near seabed stratigraphic column and natural and man-made hazard objects on the seafloor and below using site survey data for a drilling rig in the Gulf of Thailand. The processing software are used in this study that are Seismic Unix, which is developed by the Center of Wave Phenomena (CWP) at the Colorado School of Mine (CSM), and Seisee which is developed by Dalmorneftegeofizika Geophysical Company is a company in Russia. The steps of methodology in this study are composed of data collection, such as the borehole data, geotechnical data and HRSS data, proposing the processing sequence, that consist of kill, gain, deconvolution and band-pass filter, and interpretation the shallow structure which might affect to the drilling rig or offshore facilities. The geotechnical data are also included to correct the result of seismic interpretation by calculation a reflection coefficient. The results of seismic data processing sequence, that is purposed, can show the horizon, fault or discontinuity, and paleochannel clearer than before using processing and the result of reflection coefficient support the result of seismic interpretation. In conclusion, the seismic data processing a sequence consisting of kill, gain, deconvolution and band-pass filter as proposed, seem to be proper for single channel high resolution seismic data. Seismic interpretation can be checked by the reflection coefficient that the value is less than 0.25, soil layers will not display on seismic section |
| Year | 2010 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-09-10 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Pham Huy Giao; |
| Examination Committee(s) | Noppadol Phien-wej;Wanida Chantong; |
| Scholarship Donor(s) | RTG Fellowship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2009 |