CNPC BGP

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Zhao Z.,CNPC BGP | He Z.X.,CNPC BGP | Li D.C.,CNPC BGP | Yang S.J.,CNPC BGP | And 2 more authors.
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

Artificial source and axial dipole are used for time-frequency electromagnetic (TFEM for short hereinafter) acquisition. TFEM data in both frequency domains and time domains are simultaneously acquired and studied. TFEM method is based on physical property differences between hydrocarbon-bearing reservoir and non-hydrocarbon-bearing host, in other words, TFEM technique makes use of the characteristic that hydrocarbon-bearing traps cause resistivity anomaly and polarization anomaly, as well as that resistivity and polarization are sensitive to variation on porosity and permeability. High-power artificial source is used to excite underground layers to produce the EM responses, through which resistivity and polarization anomalies caused by reservoirs can be directly detected. TFEM technique has been used for thousands of kilometers profile survey and verified by dozens of exploration wells. Extensive attention has been paid to TFEM survey from oil companies. In this paper, we compare our study on different reservoir types (porous-reservoir, fracture-reservoir, blocked-reservoir) and on different trap types (structural traps, stratigraphic traps, lithologic traps) with TFEM technique, providing references for better application of the method. © 2010, European Association of Geoscientists and Engineers.


Duan Y.,CNPC BGP | Tao J.,CNPC BGP | Zeng L.,CNPC BGP | Bi M.,CNPC BGP | Feng B.,CNPC BGP
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

The Ordovician carbonate rock layer is one of the major Lower Paleozoic prospecting targets in the Ordos Basin, The gas distribution in this basin is closely related to the spread of Ordovician karst. Previous research mainly focused on weathered karst on the top of the Ordovician layer. The subsequent carboniferous sediments that deposited on the larger missing part of the Ordovician strata are thicker than its peripheral zones. It is clearly concave and can be identified by the time difference between the top and bottom of Carboniferous Strata in seismic section. In 3D seismic research on the Sulige-C block, by calculating time surface curvature and volumetric curvature attributes, we detect a collapsed paleokarst system differ from the weathered crust. The carboniferous sediment has an almost similar thickness. Calculations of surface curvature and volumetric curvature indicate that the most positive curvature signals reflect the flanks and edges of paleokarst solution collapse, while the most negative curvature signals reflect the thalweg. Volumetric curvature can help to trace the range of paleokarst solution collapse. © 2010, European Association of Geoscientists and Engineers.

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