西南石油大学学报(自然科学版) ›› 2010, Vol. 32 ›› Issue (6): 29-32.DOI: 10.3863/j.issn.1674-5086.2010.06.007

• 地质勘探 • 上一篇    下一篇

川东T构造须家河组储层地震响应及形成机制

王长城1,2   

  1. 1.成都理工大学能源学院,四川 成都 610059;2.“油气藏地质及开发工程”国家重点实验室?成都理工大学,四川 成都 610059
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-12-20 发布日期:2010-12-20

GEOPHYSICAL RESPONSE CHARACTERISTICS OF THE GAS-BEARING RESERVOIR IN XUJIAHE FORMATION EASTERN,SICHUAN AREA

WANG Chang-cheng1,2   

  1. 1.College of Energy Resources,Chengdu University of Technology,Chengdu Sichuan 610059,China;2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-12-20 Published:2010-12-20

摘要:

对川东T构造须家河组含气储层的地球物理响应特征进行了分析,采用地质与地球物理互馈结合的手段,通过合成记录正演、储层置换的方法进行了其地质形成机制研究。结果表明:T构造须家河组含气储层主要表现为低频率、弱振幅(近空白)反射,其形成机制主要有两方面的因素,一是含气层速度的降低导致振幅减弱,在薄层叠加效应的作用下,含气层下部出现弱振幅;二是含气层对高频的吸收作用,低频率导致砂泥岩互层无法分辨,表现为弱振幅。最终形成的低频率、弱振幅特征是这两种因素的综合响应,该特征在T构造高部位可以作为识别含气储层的标志。


关键词: 川东, 须家河组, 含气储层, 地球物理响应, 形成机制

Abstract: Appliying synthetic seismogram,reservoir displacement to Xujiahe Formation reservoir in eastern Sichuan area,this paper explores the characteristics of geophysical response and Formation mechanism of gas-bearing reservoir in Xujiahe formation with T-Structure in eastern Sichuan area.The results show that gas-bearing reservoir is low in frequency and weak in amplitudes reflection.The reason relies in two aspects:1.The decreased velocity of gas-bearing reservoir results in weak amplitudes,and under the effect of superimposed effects of the thin layer,the bottom of gas-bearing reservoir appears as weak amplitudes;2.The absorption of gas-bearing reservoir to high-frequency results in the mixing of sand and shale layers,and appears as weak amplitudes.The comprehensive response of these two aspects can be used as an index of gas-bearing reservoir to high position of T- Structure.

Key words: eastern Sichuan area, Xujiahe Formation, gas-bearing reservoir, geophysical response, formation mechanism

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