ANALYSIS ABOUT INFLUENCE ON SEISMIC STRUCTURE BY THE CONCEAL LOW-REDUCED VELOCITY BODY UPPER STRATA
YANG Chun-qin1, CHEN Gao2, TANG Wen-bang3
1. Exploration & Production Research Institute of Northwest Oilfield Branch, SINOPEC, Urumqi 830011, China;
2. China Hua-you Group Company, Beijing 100012, China;
3. Beijing Soft-land Science and Technology Company Ltd., Beijing 100083, China
A low-velocity abnormal body upper strata under low-reduced zone is called conceal low-velocity body.If the body were enough wide and high,it were made travel time of seismic wave to delay.The delay of travel time of seismic wave will not be corrected as a result of deficiency of the delay in conventional static correction because the body is under the low-reduced zone.Thus shape of reflected events will be changed,and result in structure form will be changed.Analysis showed that it should belong remnant static time difference that change of the shape of reflected events brought by the conceal low-velocity body.But frequently the change were be mistook to bring by structure form changed the change because change of shapes of structure forms from different depth is different.If the remnant time differences were not be removed the seismic structure map were be distortion,so it will be perplex to map out the exploration oil and gas.
杨春琴, 陈杲, 唐文榜. 隐蔽低速体对地震构造影响的分析[J]. 物探与化探, 2013, 37(6): 1056-1060,1066.
YANG Chun-qin, CHEN Gao, TANG Wen-bang. ANALYSIS ABOUT INFLUENCE ON SEISMIC STRUCTURE BY THE CONCEAL LOW-REDUCED VELOCITY BODY UPPER STRATA. Geophysical and Geochemical Exploration, 2013, 37(6): 1056-1060,1066.