000			02438nab a2200241 4500
005			20260520003104.0
008			260224s2012 xxu ing
041			_aInglés
245	0	0	_aGeopressure and Trap Integrity Predictions from 3-D Seismic Data _bCase Study of the Greater Ughelli Depobelt, Niger Delta
260			_a _b _csept./oct. 2012
270			_a22/08/2013 ; 22/08/2013
300			_a13 p. ; 383-396
520			_aTraducción del resúmen del autor: The deep drilling campaign in the Niger Delta has demonstrated the need for a detailed geopressure and trap integrity (drilling margin) analysis as an integral and required step in prospect appraisal. Pre-drill pore pressure prediction from 3-D seismic data was carried out in the Greater Ughelli depobelt, Niger Delta basin to predict subsurface pressure regimes and further applied in the determination of hydrocarbon column height, reservoir continuity, fault seal and trap integrity. Results revealed that geopressured sedimentary formations are common within the more prolific deeper hydrocarbon reserves in the Niger Delta basin. The depth to top of mild geopressure (<0.60 psi/ft) in the study area ranges from about 6 000 ft to 9 000 ft subsea. Similarly, the depth to top of hard geopressures (>0.60 psi/ft) ranges from about 10 000 ftss to over 30 000 ftss. The distribution of geopressures shows a well defined trend with depth to top of geopressures increasing towards the central part of the basin. This variation in the depth of top of geopressures in the area is believed to be related to faulting and shale diapirism, with top of geopressures becoming shallow with shale diapirism and deep with sedimentation. Post-depositional faulting is believed to have controlled the configuration of the geopressure surface and has played later roles in modifying the present day depth to top of geopressures. In general, geopressure in this area is often associated with simple rollover structures bounded by growth faults, especially at the hanging walls, while hydrostatic pressures were observed in areas with k-faults and collapsed crested structures.
581			_a2
773	0		_tOil and Gas Science and Technology _g68
942			_cARTICULO
100	1		_aOpara, A.I. _953441
100	1		_aOnuoha, K.M. _953442
100	1		_aAnowai, C. _953443
100	1		_aOnu, N.N. _953444
100	1		_aMbah, R.O. _953445
999			_c187853 _d187853