Single well seismic imaging of a gas-filled hydrofracture

Daley, Thomas M. ; Gritto, Roland ; Majer, Ernest L.

Lawrence Berkeley National Laboratory

关键词: Reflection;    Monitoring;    58 Geosciences;    Seismology;    Tomography;   

DOI  :  10.2172/821042
RP-ID  :  LBNL--53601
RP-ID  :  AC03-76SF00098
RP-ID  :  821042

美国|英语

来源: UNT Digital Library

【 摘 要 】

A single well seismic survey was conducted at the Lost Hills, Ca oil field in a monitoring well as part of a CO2 injection test. The source was a piezoelectric seismic source and the sensors were a string of hydrophones hanging below the source. The survey was processed using standard CMP reflection seismology techniques. A potential reflection event was observed and interpreted as being caused by a near vertical hydrofracture. The radial distance between the survey well and the hydrofracture is estimated from Kirchoff migration using a velocity model derived from cross well seismic tomography. The hydrofracture location imaged after migration agrees with the location of an existing hydrofracture.