Abstract:

Xinglongtai paleo-buried hill is one of the major deep-buried reservoirs in the Liaohe depression, and its exploitation
is very  important  for  increasing production of crude oil  in  the Liaohe oil  field. The  reservoir of  the Xinglongtai buried hill  is
mainly composed of magmatic and metamorphic  rocks, and  the  latter consists of biotite-plagioclase gneiss, biotite  leptynite,
(plagioclase) amphibolite and migmatite. The reservoir space is mainly fractures with good permeability. On the basis of analysing
the  response of well  logging  to  the  reservoir, using  log data  reflecting  fractures  (such as  resistivity  log, sonic  log, density  log,
spontaneous potential  log and dual  laterolog) and combining with  the cross-plots of  log data and  the  results  from oil-production
testing, we summarize in this paper the regularities of logging curves and parameters, and suggest several criteria for qualitative
and quantitative identification and evaluation of reservoir in the Xinglongtai paleo-buried hill. These criteria include rock density
of less than 2.75 g/cm3
, range difference of spontaneous potential of higher than 7 Ω·m, range difference of laterolog between 20
and 1 500 Ω·m, electrical resistivity  in deep  investigation between 20 and 2 000 Ω·m, and  interval  transit  time of 170-230
μs/m. These criteria are proved to be useful after a test with the production well logging, and provide theoretical basis for layer-
adjusting of oil well in the Xinglongtai paleo-buried hill.

Key words: paleo-buried hill, reservoir, evaluation criteria, Liaohe oil field, Xinglongtai