About Structural and Reservior interoretation

1. Structural and Reservior
interpretation of Lower Guru
(Sanghar Block).
JOURNAL OF HIMALAYAN EARTH SCIENCES VOLUME 49, NO. 1, 2016 PP.41-49

2. Group Members
Luqman
Ahmed
Rafay Hassan
Sohaib
Mushtaq
Muhammad
Nabeel
M.Sameer M.Mubeen

3. Abstract
Structural and
reservoir
interpretation
Seismic and well log
Sanghar
Block(Southern
Indus Basin)
Lower Guru
Formation
Basal
Sand(Reservior)
3

4. Abstract
Techniques
Seismic
Well
4

5. Abstract
Structural Interpretation
Using Seismic
Extensional Regime
5

6. Abstract
Reservior
Interpretation
Fateh-01
Thicknes 2700-
3100m
Correlation
factor =0.62
Paniari-01
Thicknes 2700-
3100m
Correlation
factor =0.42
Well Log
6

7. Abstract
Hydrocarb
n(36-33%)
Sand and water
Shale(42-
28%)
7

8. Introduction
Seismi
c
Geological
Subsurface
Structures
Correlate
Determine
Identify
8

9. Introduction
Whole Seismic
Information
Transformatio
Stratigraphic
Model of
9

10. Introduction
Petrophysical
Parameters
Occurance and
behavior of rock fluids
Resestivity
Density
Effective Porosity
Permeability
10

11. Introduction
Seismic
Petrophysical
Parameters
Delineate the
HydroCarbons
11

12. Geology of The Area
interaction
of three
lithospheric
plates
Pak-indo
plate
Eurasian
plate
Arabian
plate

14. Stratigraphically southern based on
predominant lithologies the Indus Basin is
divided into five sedimentary units
Basal sand
unit
Lower shale Middle sand
Upper shale Upper sand

16. Upper Goru
Age : Middle to Late
Cretaceous
Major Lithology : Middle to
Late Cretaceous
occasionally with interbeds
of silt and limestone

17. contacts
The upper contact is
transitional with the
Goru Formation
The lower contact
with the Sembar
Formation is
conformable
It may be correlated
with the Lumshiwal
Formation of Kohat-
Potwar Province.

18. Overview of research methodology
Synthetic seismogram and
correlation with well data
Time contour map
Fault picking techniques Petro physical analysis
overview

19. Synthetic Seismogram
Direct 1-D model of
Acoustic Wave Moving
through Earth
The acoustic response
of well proximity.
Marking of seismic
horizons
Well Correlation

20. To Generate Synthetic Seismogram
Sonic log
P wave Velocity
Density log
Density

21. To Generate Synthetic Seismogram
Acoustic impedance(z)=density times
velocity.
Reflection Coefficient
Synthetic seismic trace=Source wavelet*RC

23. Horizon Marking by using Synthetic
Seismogram of Fateh-01 Well

24. Horizon Marking by using Synthetic
Seismogram of Panairi-01 Well

25. Time Contour Map
 The time contour map represents an increase in values from north towards the
center.
 The center of study area represent moderate values in time contour map.
 Decrease in time contour values as we move further south of study area.

26. Time Contour Map
 Moving from east to west a slight decrease in values is observed towards the
center ( that may be due to Horst like structure).
 Moving towards West from center of study area the trend is of contour lines is
changing and many closures can be observed which could probably be a
hydrocarbon lead.

28. Fault Picking
 The study area tectonics and regime is considered.
 Any abrupt change or discontinuity in seismic section indicates some faults.
 The faults marked in the times section are normal faults making horst and graben
geometry.

30. CAMPARISON OF SEISMIC PARAMETER
INTERVAL
VELOCITY
DENSITY
ACOUSTIC
IMPEDANCE
REFLECTION
COEFICIENT

31. CAMPARISON OF SEISMIC PARAMETER
Correlation of Reflection
coefficient from seismic line
and well data of Fetch-01 and
Panairi-01A strong correlation
of 0.62 results in case of Fetch-
01 well.

32. CAMPARISON OF SEISMIC PARAMETER
Corellation of reflection coefficent from
Fateh -01 and Panairi-01 with strong
correlation 0.43.

33. Seismic and well log parameters for
cretaceous Lower Goru Formation

34. Petrophysical analysis of reservoir zone and all
three formation(u,l,basal unit) in these well.

35. Petrophysical analysis of Fateh-01 well shows variation of
different curves with depth and lithology.

36. Petrophysical analysis of Panairi 01 well shows variations of different curves
with depth and lithalogy. The zone of low saturation water exist between
3152 to 3210m.Petrophysical analysis of Panairi 01 well shows variations of different curves
with depth and lithalogy. The zone of low saturation water exist between
3152 to 3210m.

37. Conclusion
 Interpretation of faults indicates normal
faulting (Horst and Graben structures) in the
study area
 These are formed due to:
 Rifting of Indian Plate from African plate during
Jurassic and early cretaceous in the north east
direction.
 collision with the Eurasian plate
in Paleocene

38. Conclusion
 Contour maps of Lower Goru
Formation show many closures towards center
portion as we move from East to West.
 Closure of 39 m. Slightly west from center of map
 Probably!Be a hydrocarbon lead.
 Comparison:
velocity,density, Acoustic Impedance and Reflection Coefficient estimated from seismic and well log
data shows that area is less complex as compared to collisional belt resulting in folding
and faulting) with horizontal reflectors.

Density and Velocity values of
Lower Goru Formation indicate saturated
rocks .

39. Closures showing

40. Conclusion
 Reservoir zone from range of
 2700 m to 3100 m in both the wells is mostly
 Water bounded zone rather than
A hydrocarbon bounded zone.
 Both average percentage of water saturation is 63.45%.
 This may be due to “Hydrophobic
Effect” caused due to excessive water.
 This effect might have prevented the hydrocarbons to penetrate in the rock.
 Move to some other
distant location this can be confirmed on the
basis of surrounding blocks which are rich in
hydrocarbons.


41. Pinching of form.
 Bassal sand lot of oil.
 Pinchout basal sand at that place where survey is conducted
 Petro-physical analysis can taken and properties like porosity,permeability and
TOC will taken into account.

42. Two well comparison in depth