隐蔽低速体对地震构造影响的分析  

ANALYSIS ABOUT INFLUENCE ON SEISMIC STRUCTURE BY THE CONCEAL LOW-REDUCED VELOCITY BODY UPPER STRATA

作　　者：杨春琴[1] 陈杲[2] 唐文榜 

机构地区：[1]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011 [2]中国华油集团公司,北京100012 [3]北京软岛科技有限公司,北京100083

出　　处：《物探与化探》2013年第6期1056-1060,1066,共6页Geophysical and Geochemical Exploration

摘　　要：地层上部、低降速带之下存在的低速异常体,称之为隐蔽低速体。当其厚度和横向尺度较大时,将会使地震波旅行时发生较大的变化。隐蔽低速体由于处于低、降速带之下,一般静校正处理对其产生的地震波走时延迟的校正往往缺失,因而这种旅行时的变化将会使地下反射同相轴的形态发生变化,即构造形态发生变化。分析发现,隐蔽低速体对反射波形态的改变应该属于静态时差影响的范畴,但是,由于其对不同深度反射波形态的改变是不完全相同的,往往被误认为地下构造形态发生了变化。若不对其正确地处理,得到的地震构造图将会失真,给勘探部署带来困扰。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.

关 键 词：隐蔽速度体 构造形态畸变 静校正 

分 类 号：P631.4[天文地球—地质矿产勘探]