2. 2D Seismic
Interpretation and Attributes Analysis
of Dhodak Gas/Condensate field,
Central Indus Basin, Pakistan
Presented by Hakmatyar Ahmad
(Bacha khan university charsadda)
Supervised by Mr.Matee Ullah
(Lecturer at Khushal khan Khattak university karak)
3. Project Outlines
Introduction of the Area
Geology of the Area
Tectonic Map of Pakistan
2D Seismic Data Interpretation Analysis
4. Project Outlines
Generation of Synthetic Seismogram
Marked Reflectors Information
Interpretation of Seismic Sections
Time Contouring Maps
Depth Contouring Maps
Average Energy Attribute
Dhodak Condensate and Gas
Field is the northern most
Culmination of the Sufaid Koh
Situated on the eastern margin of
the Suleiman Ranges about
80 km of the Dera Ghazi Khan
City Punjab Provence.
Tectonic map of Pakistan.
7. Data Obtained
Seismic Lines Data Provided by the DGPC
Seismic Lines Data
Line Name Line
Shot Point Total Shot
Strike Line North-South 110-300 190
Dip Line East-West 110-190 80
Dip Line East-West 110-250 140
8. Data Obtained
Well Log’s Data Provided by the DGPC
Well Logs of Dhodak Well # 1
Lace Files Data Dhodak Well # 1
Calliper Log Present
Gama Ray Log Present
SP Log Present
Resistivity Log Present
Density Log Present
Neutron Porosity Log Present
Sonic Log Present
ASN Log Present
DRHO Log Present
SN Log Present
MINOR Log Present
To delineate the subsurface target horizons on the seismic lines by
using the synthetic seismogram in the seismic interpretation.
Identification of Faults.
Time and depth contour maps generation in order to locate probable
Attribute Analysis are done by using the following attributes to
delineate the subsurface structures.
Average Energy Attribute
To make a detailed critical inspection about geology tectonics of this
Distinguishing to perform the real reflectors on the seismic section.
With the help of seismic sections the faults will be marked.
The arrangement of Time and Depth contours of noticeable
Finding a solution for velocity windows to judgments a probable
According to seismic survey the Base map of Dhodak well 01 have
been made ready.
Explanations to interpreting the Attributes attempts are done.
15. Petroleum Plays in the Area
In the Dhodak Field the main Source rock is the Sembar Shale of
cretaceous age. Other source rocks which are present in the Lower
Indus Basin are the Ranikot shale, Ghazij shale, Coal and Shale of the
Nari Formation and Moghalkot Formation.
Reservoir rock of the area is Pab Sand(Cretaceous) Stone in the
Dhodak Field. Other Reservoir rock are Guru Formation(Lower
Cretaceous), Bara Formation(Middle Paleocene) and Lakki
Limestone Formation (Early Eocene).
Upper Ranikot is the seal rock of the area.
25. Time Contour Map
Contouring is “The imaginary line that exhibiting the same
parameter on 2D map such as depth , time, elevation etc.
Here with the help of time rate contours are created which is that
time of the wave which reflect backs due to the change in density
contrast of the subsurface strata are change in acoustic impedance.
The Time contours are initiated for every reflectors on map.
In our research the time contour maps of the three essential
reflectors are on three seismic section are projected on the base
29. Depth Contour Map
The depth contour map point out the structures of the area as well as
contributes the overall information’s about the depth along with its
range of precise formation.
The given up depth contour maps are originated with the help of the
reflection time rates of the seismic lines of the Dhodak area that
containing the GO-795-SK-06, GO-795-SK-11A and GO-805-SK-
19 as point out in the consequential pattern.
The depth contour contribute us to help in the conception about 3-
Dimensional structure of the peculiar lithology that pointing out its
depth as a surface.
35. Introduction to an Attributes
An Attributes are the essential pieces of information observe within a
recorded seismic trace, frequency, amplitude, time and attenuation is
known as Seismic attributes (Brown, 2001).
Attributes analysis used for the identification of seismic facies,
depositional environments, bedding indicator, unconformities,
continuity and discontinuity of lithology, hydrocarbon indicator and to
determine the geometry of a buried rock body that is normally be
under the seismic resolution but here the attribute are used for fault
Seismic Interpretation is mainly done on the basis of the available
information and the stratigraphy of the area.
In my area source rock is Sember Shale, Reservoier rock is Pab
Sandstone while seal rock is Upper Ranikote Shale.
Reflectors are marked and then conformed on the basis of Synthetic
Seismogram which are Dunghan Formation, Lower Ranikot
Formaton and Pab Sandstone.
In Seismic Interpretation Time and Depth contour maps of the all
Formations were generated by using the Kingdom Software.
The Study Area is a Compressional Regime Thrust Faults are
dominated all over the area along with Pop Up Structure.