Study on Seismic Response Characteristics of Ordovician Buried Hill Karst Reservoir Based on Forward Modeling:Taking Lungu Area in the Tarim Basin as an Example
Received date: 2015-05-20
Revised date: 2015-07-27
Online published: 2015-09-20
Several tectonic movements were developed in the Lungu area of Tabei,forming a complex fault system,which also led to a complex reservoir space system.Several stages of karstification were confirmed in the Ordovician buried hill karst with strong epikarst karstification.Reservoirs were characterized by various types of reservoirs,variable characteristics in seismic response,large changes in vertical and lateral,deep buried depth,and various controlling factors on the reservoir bodies.All these characteristics caused a lot of difficulties in reservoir prediction for reservoirs of Ordovician buried hill.Aiming difficulties in reservoir prediction,selected relatively accurate reservoir parameters to design three models by forwards technique according to statistical analysis of several drilled wells.Study on seismic response characteristics in Ordovician buried hill karst has been carried out to guide the prediction of reservoirs in Ordovician buried hill karst.According to the study results,seismic response characteristics of reservoirs in Ordovician buried hill karst of Lungu area were listed as below:The size of “string” reflection increased along with the increasing cave scales;with the increase of cave scales,the main frequency of the “string” reflection will decrease correspondingly;when “string” reflection was developed in the top of buried hill,the upward-shift of phase can be found in the wave-impedance surface of buried hill;while cave was developed in the top,weak reflection can be found in the top-surface of the buried hill.Along the increasing distance between the cave and top-surface of the buried hill,“string” reflection will move downwards gradually,and the weak reflection in the top of buried hill will transfer to strong wave-peak gradually.With the increase of distance between two caves in vertical,coherent interference between “string” reflections transfer to subtraction interference gradually,and vertical elongating also increases correspondingly.
GONG Hong-lin,ZHANG Hu-quan,WANG Hong-bin,YU Jian-ping,YAO Qing-zhou,LI Chuang,HU Zai-yuan,LI Hui-zhen . Study on Seismic Response Characteristics of Ordovician Buried Hill Karst Reservoir Based on Forward Modeling:Taking Lungu Area in the Tarim Basin as an Example[J]. Natural Gas Geoscience, 2015 , 26(S1) : 148 -153 . DOI: 10.11764/j.issn.1672-1926.2015.S1.0148
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