Abstract
At Tahe Oilfield Ordovician strata, caves and underground rivers are the commonly developed geological structures…. Caves and underground rivers serve as connection pipes for different types of reservoirs, and are also an important part of a reservoir. This paper presents the researched carried out on a block of high resolution 3D seismic data from Tahe oil field. For the research, Absorption quality factor attribute (AQF) was tested with the aim of identifying the cave and underground river systems. In the AQF attribute sections, the caves were depicted clearly and some inconspicuous dot-like seismic reflection and some seismic reflection troughs were better displayed. In addition, the original seismic, similarity attribute data, body sculpting technology and drilling data successfully verified the caves which were predicted from the AQF data. Our research shows that AQF attribute identifies the caves and underground river systems very well. Hence, AQF attribute is useful in identifying and dividing caves and underground river systems.
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