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| PROGRESS OF RESEARCH ON QIONGDONGNAN BASIN SLOPE FAULT ZONE VELOCITY |
| LIU Ai-qun, CHEN Dian-yuan, LI Qiang, ZHANG Li-li |
| Zhanjiang Branch of CNOOC Ltd., ZhanJiang 524057, China |
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Abstract Qiongdongnan basin fault zone is one of the marker faults for fault partition and one of the central depression downthrown fault zones. Regional studies show that the central depression has a good hydrocarbon potential, so the area has been considered to be a favorable oil and gas exploration area. However, due to the formation of large sets of deposited shale resulting from drastic changes and rapid progress of water depth and slope, it is difficult to determine the velocity in this area, so the velocity problem constrains the exploration of the slope break in Qiongdongnan basin and becomes a difficult problem. In this study, the authors first analyzed the quality of the speed spectra available so as to understand the overall variation trend of the velocity, followed by considering the velocity obtained by drilling results; in combination with stratigraphic variation information, the velocity interpretation was carried out, and the energy in the center was used to explain the standards of velocity interpretation. Finally, on the basis of careful velocity interpretation, the forward model of two-dimensional velocity profile analysis confirmed the existence of a target structure.
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Received: 09 March 2011
Published: 10 December 2012
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