Geology Reference
In-Depth Information
In the second stage, a detailed study is conducted of the geo-fluid-
dynamical environment in the forecast territory and targets of the proposed
operations. At this stage quantitative determination of spatial fluctuations
in parameters of hydrodynamical, hydrochemical, geobaric, geothermal
and lithofacies fields is performed.
At the third stage, qualitative associations and quantitative correlations
are established between the traps' architecture parameters and the attribute
combination in their geologо-physical fields.
Dujring the fourth stage, general patterns in spatial oil and gas distribu-
tion are determined based on the known field with an estimation of reserve
density parameter ( Q d ) for specific structures.
At the fifth stage, using the pair and multiple correlation apparatus, the
correlation is established between the function and all its earlier deter-
mined variables/arguments, and a map geological-mathematical model of
oil and gas occurrences is generated. The model allows for the interpola-
tion (fine-tuning of the appraised reserves) within the known ranges of
realistic productivity and acceptable extrapolations (probabilistic reserve
estimation) into poorly-studied territories with determining the spatial
position of the zero oil- and gas-saturation line.
The proposed sequence will enable sufficiently reliable identification
of most prospective local structures for the first priority exploration and
appraisal operations and the areas with poor, very poor and zero geologic
expectation.
An advantage of the technique is also a possibility to use within its
constraints test results of the first (reference, reconnaissance, preliminary
exploratory and advance) wells and data from mandatory 2D and 3D seis-
mic surveys and parametrizing the specific features of local structures. It
means the availability of necessary geologic support in the initial stage of
forecasting oil and gas occurrences and planning the priorities and specif-
ics of the exploration process in conditions of substantially limited geo-
logic information.
Using the described technique, we re-estimated from the original in-
place quantities into the current proved reserves the hydrocarbons of 107
discovered fields and 42 appraised prospects in the basin with clear indica-
tions of oil, gas and condensate as of January 1, 2006. For the entire region,
the А+В+С 1 reserves of the Productive Sequence / Red-Bed Sequence
within the entire depth range of 0-8.5 km are: oil, 872.53 MMT; conden-
sate, 195.13 MMT; gas, 2,145.44 BCM; total hydrocarbons, 3,213.1 MMT
of oil equivalent. The respective С 2 quantities are 1,020.38 and 208.62
MMT; 2,028.29 BCM and 3,257.29 MMT of oil equivalent.
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