Using Adjacent Seismic Reflection Characteristics of the Energy Mix to Exclude “Bright Spot” Trap:Taking Deyang Syncline in Western Sichuan Depression as an Example
Received date: 2012-10-08
Revised date: 2013-04-26
Online published: 2013-12-10
During the shallow lithologic gas reservoir exploration in the western Sichuan Depression,seismic amplitude “bright spot” anomaly is an important basis for the reservoir identification.However,more and more drilling wells confirmed that the “bright spot” anomaly may be a trap resulted from the non-reservoir such as mudstone,thin-interbedded layer,dense sandbody.Based on the typical drilled well seismic analysis in the Deyang syncline,western Sichuan Depression,this paper summarized the seismic response characteristics of sandbody with different physical properties,and established a high quality reservoir identification model with features of “strong trough top,strong peak bottom” and “weak top and strong bottom” of adjacent peak reflection energy.At the mean time,seismic amplitude “bright spot” trap can be excluded by using the characteristics such as “strong top and weak bottom,double strong” of adjacent peak reflection energy,improve the reservoir prediction accuracy which is based on seismic energy reflection.This method is simple,intuitive,easy to realize,moreover,it is accurate and reliable which has been proved by the drilling results.
Key words： Lithologic gas reservoir; Bright; Trap; Reflected energy; Quality reservoir
ZHAO Shuang，GAO Qian . Using Adjacent Seismic Reflection Characteristics of the Energy Mix to Exclude “Bright Spot” Trap:Taking Deyang Syncline in Western Sichuan Depression as an Example[J]. Natural Gas Geoscience, 2013 , 24(6) : 1253 -1259 . DOI: 10.11764/j.issn.1672-1926.2013.06.1253
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