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M.Sc Geophysics Dessertation on Seismic Reflection Interpretation and Reverse Modeling with Well correlation of Sanghar Area of Sindh Pakistan

M.Sc Geophysics Dessertation on Seismic Reflection Interpretation and Reverse Modeling with Well correlation of Sanghar Area of Sindh Pakistan

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Majid MSc Presentation Majid MSc Presentation Presentation Transcript

  •  To prepare graphs of average velocity, mean velocity and Iso-velocity, to investigate the lateral and vertical variation in velocity. Marking and Identification of Seismic Horizons by using well top data. To prepare the Time Contour Map and Depth Contour Map using K-tron X-Work and surfer and interpret the subsurface structure. To develop an understanding of tectonic, stratigraphic and structural framework of the area.
  •  To prepare two way Time contour maps, Depth contour and Surface Maps using the lines 856-SGR-52,846-SGR-45, 856-SGR-55 and 856-SGR-62 of Basal Formation which is a reservoir formation. For this purpose K-tron X-Work and surfer softwares are used. Reverse Modeling of Seismic section into Impedance section using Advance surfer. Correlation of four wells by Log plot software using well tops data.
  • PART-I  STRUCTURAL AND STRATIGRAPHICAL INTERPRETATION PART-II REVERSE MODELLING OF SEISMIC SECTION INTO IMPEDANCE SECTION AND WELL CORRELATION
  • ANDITS GENERAL GEOLOGY AND TECTONICS
  • www.mapzones.com
  • Latitude 27° 43’ to 28° 05’ NorthLongitude 69° 35’ to 69° 57’ East www.googlearth.com
  • . K-tron Precision Matrix
  • Kazmi & Jan, 1997
  •  Source Rocks Sembar Formation. Reservoir Rocks Parh Limestone, Basal sand of Lower Goru Formation and Ranikot Formation. Caps Rocks Shale and Marl of Upper Goru.
  • STRATIGRAPHY OF THE STUDY AREA
  • (www.ogdcl.com).
  • SEISMIC SECTION
  •  Lines 856-SGR-52 and 856-SGR-55 Area Sanghar Orientation NW-SE Nature Dip Line and Strike Line Well on the Line Sachal and Barkat is near to SGR-55 line Energy Source Dynamite S.P 101-667 and 101-1215 Number Of Folds 80 Folds Company OGDCL
  •  Reflectors marked 4Reflectors on both Sections Faults 6 Normal faults on SGR-52 5 Normal faults on SGR-55 Major Structure Horst and Graben
  • PART-I STRUCTURAL ANDSTRATIGRAPHICAL INTERPRETATION
  •  To mark the reflectors. To prepare the Average Velocity Graph Of the line 856-SGR-52 and 856-SGR-55. To prepare the Mean Velocity Graph. To prepare the Iso Velocity Map. To prepare the Time and Depth Section of the line 856-SGR-52 and 856-SGR-55. Time and Depth contour maps for identification of Structure. To Identify and name the Reflectors with the help of Well tops of Bobi,Barkat,Sachal and Hartungu.
  • (K-tron VAS)
  • (K-tron VAS)
  • (K-tron VAS)
  • (K-tron VAS)
  • (K-tron VAS)
  • (K-tron VAS)
  • (K-tron VAS)
  • (K-tron VAS)
  • (K-tron Visual Oil)
  • (K-tron Visual Oil)
  • (K-tron X-Work)
  • (K-tron X-Work)
  • (K-tron X-Work)
  • (K-tron X-Work)
  • Depth (m) = VT 2Where, T = Two way vertical time (s) V = Average velocity (m/s) for each respective time
  • (K-tron X-Work)
  • (K-tron X-Work)
  • (K-tron X-Work)
  • (K-tron X-Work)
  • (K-tron X-Work)
  • (K-tron X-Work)
  •  Following conclusion were deduced based on the current studies: The study area is dominated by Normal Faults. The Normal faulting in the area shows that the area was deformed by the extensional tectonic movement. Since the area is under extension so horst & graben structure is present in the study area. From the structural and stratigraphic interpretation it is concluded the structure formed in the area may act as a favorable trap for the accumulation of hydrocarbons
  • REVERSE MODELLING OF SEISMIC SECTION INTO IMPEDANCE SECTION AND WELL CORRELATION
  •  INTERVAL VELOCITY Vint = Z2-Z1/t2-t1 INSTANTANEOUS VELOCITY Vinst = dZ/dt ROOT-MEAN-SQUARE VELOCITY Vrms=√ (sum of product of square of interval velocities and time/sum of one way travel times) STACKING VELOCITY t=√t²○+x²/V²stack
  • CONCLUSION Vav≤Vrms≤ Vst (Dobrin , 1976)
  •  LATERAL VARIATIONS IN SEISMIC VELOCITIES VERTICAL VARIATIONS IN SEISMIC VELOCITIESCORRELATION BETWEEN VELOCITY TYPES Sq. Vint,n = (Sq.Vrms,n*Tn)-(SqVrms,n-1*Tn-1) Tn-Tn-1 Vint,n = (Vav,n*Tn)-(Vav,n-1*Tn-1) Tn-Tn-1 Vav,n = (Vint,n*Tn-Tn-1)+(Vav,n-1*Tn-1) Tn
  •  THE SHEAR WAVE VELOCITY Vp = 1.16Vs + 1.360 THE DENSITY DETERMINATION ρ = 0.31 * (Vp) 0.25 THE COMPRESSIONAL WAVE IMPEDANCE Impedance = ρ*Vp THE SHEAR WAVE IMPEDANCE Impedance = ρ*Vs
  • P-waves impedance showing hydrocarbons Zone
  • S-waves impedance showing hydrocarbons Zone
  • P-waves impedance showing hydrocarbons Zone
  • S-waves impedance showing hydrocarbons Zone
  •  Anomalous(Hydrocarbons)Zones can be detected with help of impedance. In Sanghar Area similar zone has been detected by P-Waves impedance that is confirmed then by S-Waves impedance. It can be studied further with the help of enhanced data and advance approach.
  •  It is a direct method to investigate depositional setting of an area by correlating different stratigraphic successions encountered in different wells
  •  Using well tops data of four wells Bobi-01, Barkat-01, Sachal-01 and Harthangu-01drilled at Sanghar area lithologies are studied by using Log Plot Software. To study the stratigraphic variations in an area usually wells are correlated. In well correlation we observe the thickness and depth of each strata.
  •  Kadri I.B., (1995), “Petroleum Geology of Pakistan’’, PPL, Karachi, Pakistan. Kamran, M. and Ranki, U., (1987). “Pakistan oil data, Hydrocarbon Development Institute of Pakistan”. Khan, K.A., 2000. Integrated Geo Systems - A Computational Environment for Integrated Management, Analysis and Presentation of Petroleum Industry Data, In: T. C. Coburn and J. M Yarus (Eds.), Geographic Information Systems in Petroleum Exploration and Development, American Association of Petroleum Geologists, AAPG Book on Computers in Geology, pp.215-226.
  •  Khan, K. A., Akhtar, G., Ahmed, Z., Khan, M.A., and Naveed, A., 2006, Wavelets - A Computer Based Training Tool for Seismic Signal Processing, Pakistan Journal of Hydrocarbon Research, Vol. 16, pp.37-43. Khan, K.A., Akhtar, G., Ahmad, Z., and Rashid, M., 2008, Development of a Projection Independent Multi-Resolution Imagery Tiles Architecture for Compiling an Image Database of Pakistan, Proceedings of 2nd International Conference on Advances in Space Technologies Islamabad, Pakistan, p.164-170
  • To all my faculty members but special Thanks to Sir Anees Ahmed Bangash whose guidance leads me to touch this stage