| Along with the rapid progress in energy technology industry , the integration of computer data processing techniques have been deepening penetration and merging in its research and development process. It's also an effective way to make this industry develop more efficiently. Meanwhile, with the boost of the PC performance, mass data storage has become possible. Seismic data interpretation and processing by Microcomputer have become a trend of the technological development in this industry.Seismic data interpretation refers to the process of changing seismic information into the geological results. Seismic interpretation system will make the process visualized. Reservoir prediction will be made conveniently and efficiently by using computer technology to do data processing, comparing and tracking oil layer with the corresponding top and bottom of the seismic reflection layer. By displaying those results with rich quality images and powerful operational functions, it can greatly enhance the work efficiency of those people who are engaged in the seismic data interpretation. Thus, there is an inextricable relationship between seismic data processing and interpretation of seismic data. As we know, the quantity of gathering seismic data often tends to be a huge amount which is likely to exceed several or a few tens of GB. Therefore, in the course of the exchange and sharing of data information, data storage format will become a very important premise. Data format conversion, storage, management and property calculation are the basis and guarantee for the research activities of seismic data retrieval, extraction, processing, analysis, drawings and explained, etc.Looking back on history, the original data records of geophysical methods evolved many recording media from handmade paper records, magnetic disk recording, the small-capacity tape recording, high-capacity tape recording to compact disc records. More and more information had been recorded and the data recording methods became more complicated and different too. In order to share seismic data collected by different geophysical companies, and also for resource conservation, American Society of Exploration Geophysicists(SEG) established a series of standard for seismic data formats, such as SEG A, SEG B, SEG D, SEG X and SEG Y. Among them, SEG Y (SEGY-Society of Exploration geophysicists Y format) tape recording format standards has become the most common standards of 3D seismic data storage tapes recorded format in the international community and has been widely applied in the oil field at present.This thesis is a research on the storage format of post-stack data based on the large-scale seismic interpretation project'SEIWAVE - system of 3D seismic reservoir prediction and well-site deployment', which is launched by the Exploration and Development Research Institute of Daqing Oilfield Co., Ltd. In this thesis, based on regrouping of historical data, we defined a PM data volume which is a new seismic data format just to fit the system itself demand. The international common used standard SEG Y data format structure is researched and decoded in this thesis. The designation realized the conversion between system-defined data volume PM format and the SEG Y format and achieved the two seismic processing modules, including data loading into PM format and data exporting to SEG Y format. All this provide a better solution for the data exchange and share interface problems between SEIWAVE system and other seismic interpretation systems or related professional geological software. This made standard exchange feasible and enhanced the data validity and using frequency, also improved the Seismic interpretation level and efficiency of actual research and production. The source data of system-defined PM data volume comes from post-stack data which had been processed by other seismic interpretation software and the storage format before. PM body only extract the pure seismic data part and stored 100 lines pure data in one file in binary, but removed the so-called file header information which is not like other formats. The extracted relevant parameters information is stored in other ASCII files to reduce the amount of one-time processing data,then the imaging and display of work area base drawing can be carried out highly and effectively , the process of interpretation can be accelerated too.As the most universal international standard format, this thesis focused on the rev 1 of SEG Y standard format for the main study, and made a thoroughanalysis and research on the standard's file structure in every part, parameter setting, data storage format, output design and realization.SEG Y standard data format contains two main parts, the real identification header and the data record. The real identification is made up of textual file header and the binary file header, while the data record id make up of trace header and the trace data. It's the real identification header and each trace header together that constituted a complete explanation of a SEG Y data body, in which the parameters can be customized following certain rules in accordance with the requirements of the user. It is convenient for data preservation and exchange between different software systems and data after-treatment. Meanwhile, these parameters play a vital role in the encoding and processing of data. Any deviation of the parameters may lead to a whole SEG Y parameter data files internal contradictions and data reading failure. Besides that, SEG Y standard format also involves the formats exchange problem among four data formats, which include 32-bits IBM and IEEE float number,32-bits integer and 16-bits integer number, and data byte ordering problems of big-endian or little-endian were involved too.On the other hand, the amount of seismic data is huge. What is of importance and difficulty is to position the required profile data fast and accurately. For that, after research on relevant data storage formats, the algorithm about how to position and extract PM data body is put forward and studies in this thesis, which implemented the efficient and precise function of data position.In realization process of the seismic data import and export modules, some technical difficulties are involved, such as:â—‹1 the design and realization of SEG Y file structure,â—‹2 the extraction and redefinition of seismic parameters,â—‹3 the research and solution of huge data amount file disassembling control,â—‹4 the study of file I/O problem,â—‹5 the application of thread in file export, etc.As the result of this thesis, taking the StarTeam as the program management and edition control tools, the seismic data process module of the'SEIWAVE - system of 3D seismic reservoir prediction and well-site deployment'is developed and realized on the platform of Windows XP andDelphi 2005. The system not only provides the corresponding means of interpretation for reservoir prediction and well-site deployment, but also extracts stratum information as more as possible for seismic interpretation researchers and revealed a lot of delicate information which had not been paid attention to before. In the actual production and exploration, this system was widely applied, and makes contribution to the construction of the medium-depth and shallow layer oil exploration project in northern of Songliao Basin, which is also the significance of the study in this thesis. |
PDF Full Text Request