ANNEX 8

GEOLOGICAL ASSIGNMENT for 2D CDP field seismic survey at Block 12 in the Republic of Iraq

Grounds for assignment issuance: Exploration, Development and Production Service Contract (“EDPSC”) for Block 12 between South Oil Company of the Iraqi Ministry of Oil, OJSOC Bashneft and Premier Oil Company.

Site location: the Republic of Iraq, Al-Najaf and Al-Mutanna provinces

1. Purpose of work, spatial boundaries, and main evaluation parameters1.1. Purpose of work: a detailed study of the area geological structure with the aim of

geometry determination of Salman field, resource estimation and preparation of exploration drilling targets.

1.2. Geographic boundaries of 2D CDP seismic area (source point polygon):

Point numberNorth latitude East longitude

degree minute second degree minute second

1 30 11 47 44 8 202 30 15 12 44 1 253 30 37 32 43 39 424 30 41 24 43 39 45 30 43 38 43 50 46 30 43 38 44 3 167 30 43 16 44 8 348 30 36 48 44 13 189 30 43 48 44 22 5110 30 43 53 44 26 311 30 43 26 44 28 912 30 31 51 44 39 2813 30 20 49 44 53 2714 30 17 30 44 56 4015 30 14 28 44 56 2216 30 11 42 44 52 3117 30 11 26 44 27 5

1.3. Main evaluation parameters: the type and scope of work include a spatial 2D CPD seismic survey covering 1226 linear km (through extreme line shot points) at a scale of 1:25 000

Stratigraphic picks in Salman-1 well:

Period Epoch Formation　

Wireline logging

Depth Depth Depth Thickness

(mBRT) (mTVD) (mTVDSS) (m)

CRETACEUOUS

LATE

Safawi 862 861.98 594.05 214

Tanuma 1288 1287.97 -1020.04 12

Rumaila 1333 1332.97 -1065.04 5

EARLY

Nahr Umr 1506 1505.97 -1238.04 183

Zubair 1696 1695.97 -1428.04 381

Ratawi 2077 2076.92 -1808.99 130

JURASSIC

LATEGotnia 2241 2240.91 -1972.98 118

Najmah 2359 2358.91 -2090.98 353

MID Sargelu 2712 2711.89 -2443.96 486

EARLY Butmah 3432 3431.87 -3163.94 345

TRIASSIC LATE

Kurra Chine 3777 3776.85 -3508.92 385

Geli Khana 4162 4161.83 -3893.9 115

2. Geological assignment Obtain high quality field data (seismic trace and associated data) providing, after subsequent processing and interpretation thereof, for a detailed geological structure study of the area; oil and gas prospective target identification; preparation of recommendations for a detailed 3D CDP survey.

3. Work scope, sequence and methodology3.1. Carry out engineering and field seismic operations in accordance with the Company

Regulation “On engineering and performance of 2D and 3D onshore field seismic operations” No. П1-01.02 Р-0008 version 2.00.

3.2. Against the Customer’s power of attorney obtain work permits for the performance of work within the timeframe set out in the calendar plan.

3.3. Carry out a reconnaissance survey of the work area to the maximum extent in advance of production operations. During the reconnaissance survey a special attention should be paid to the possibility of crossing barriers, anthropogenic obstruction areas and other exclusive zones. According to the results of the reconnaissance survey and if required, promptly update the design of the seismic survey and have the adjusted design agreed with the Customer. If necessary, several options of seismic survey designs should be proposed, provided that a special attention should be paid to the technologies of exclusive zone crossing, taking into account the need to record the uppermost reflections indicated by the Customer.

3.4. Set out from the design scheme and perform SP and RP geodetic tie using modern navigation systems accurate enough to enable the work to be performed on a 1:25 000 scale.

3.6. Before the survey starts, carry out test surveys to optimize the conditions for seismic energy excitation in various landscape conditions typical for the studied area (a dry lake – a karst cavity, elevation) according to the program provided by the Customer. The final location of the test survey line should be agreed with the Customer. On-site processing of test survey data shall be performed using a field data processing system to compute unnormalized amplitude-frequency spectra of seismic records (with a linear scale along the vertical) in the interval of

target reflections in order to determine the values of basic quality attributes based on the analysis of the following attributes:

average absolute microseism amplitude; average absolute amplitude outside the interference cone on target horizons (signal); signal/microseism ratio; average absolute amplitude in the interference cone (surface wave); signal/interference ratio in the target interval; Dominant frequency in the target interval across the width of the main half period of the

ACF outside the surface wave cone;

Based on the results of test survey data processing, specify seismogram quality acceptance and evaluation criteria, taking into account the seismic and geological conditions of the studied area.

Submit to the Customer a brief report containing conclusions on recommended shooting and recording parameters, as well as seismogram quality acceptance and evaluation criteria and test survey results. The report and conclusions shall be agreed with the Customer, whereupon seismic observations shall be commenced in accordance with the acquisition assignment.

In case seismogram quality deteriorates during seismic acquisition, additional test surveys shall be performed to adjust the methodology parameters.

3.7. When planning the acquisition sequence in the work area, select an optimal timing for exclusive zone crossing with regard to weather conditions and noise cycling.

3.8. During field operations the following survey method should be used: SOURCE PARAMETERS

Source Type Vibration NOMAD-65 or a complete analogueNumber of SPs used to excite seismic energy 4 (to be confirmed based on test survey results)

Type of source array, source array linear, line interval 33 m, source interval 1 m

Type of sweep signal linear frequency modulationStart sweep frequency, Hz 7 (to be confirmed based on test survey results)End sweep frequency, Hz 120 (to be confirmed based on test survey results)Sweep time, sec 0.5Sweep length, sec 12-24 (to be confirmed based on test survey results)Number of excitations per 1 SP 1-12 (to be confirmed based on test survey results)

Excitation power (Vibrator drive level) 50%-60% (to be confirmed based on test survey results)

SP spacing, m 50 mSP location between RPsDeviation of the source group center from the excitation picket

±3 м

RECEIVER PARAMETERSObservation system Flank – Central – FlankNumber of active channels per a physical observation (for all observations)

338

Number of geophones per channel 12

Array method; sensitivity distribution base 25 m, linear, regular

Deviation of geophone group center from the recording stake

0.5 m maximum

RP spacing, m 25Fold 84Minimal offset 12.5Maximum offset 4212.5

RECORDING PARAMETERSSeismic station Sercel-428 XL or a complete analogueRecord length, sec 5Sampling rate, sec 0.001Pre-amplification factor 0 dBCorrelation till the vibration records are stackedLow frequency filter 0.8 F Nyquist; Lin PhaseHigh frequency filter Open channel- record format SEG-D

- medium type NASstart shuttle server 360GB (to be approved by the Customer)

3.9. Ensure daily quality control of field data and geometry of the observation scheme by processing them at the field data processing system according to the set of procedures agreed with the Customer.

3.10. Provide to the Customer, on a day-to-day basis, information on the progress of field seismic acquisition.

3.11. Ensure prompt telephone and e-mail communication with the Customer from the seismic crew’s deployment site.

3.12. Ensure the registration of instrument impulse-test processes with connected geophone arrays to reflect geophone effects in subsequent data processing.

3.13. Ensure recording of seismic line noise during seismic acquisition at least every two hours of operation.

3.14. Carry out the final acceptance of field data by the commission consisting of the Customer representatives and the processing contractor. The location of the final acceptance shall be determined by the Customer.

3.15. Each ten days deliver and transfer copies of the field data to the Customer or, as the Customer may instruct, to the processing center directly.

3.16. Deposit the seismic data to the seismic data repository as required by the Customer.

4. Expected results and deadlines4.1. Upon completion of the seismic survey, the Customer will be provided with the following data in accordance with the Company Methodical Guidelines “Requirements to the formats of seismic data storage, presentation and exchange” No. П1-01.02 М-0006 version 1.00:

seismic acquisition plan; field seismic data on hard disks (field test and field data acquisition results) in SEGD

format; design and staked SP and RP location scheme with vintage 2D seismic grids and vintage

3D seismic acquisition area outlines; operators’ reports indicating natural and artificial factors affecting the acquired field data

quality and describing all deviations from the design survey technology;

instrumental test results of recording equipment checks and seismic wave sources: reporting responses of vibration sources on the quality of the emitted signal (WAPS); receiving array and recording equipment test results (field and equipment tests, impulse tests (recordings of instrument impulse-test processes);

certificates of array stations liquidation and offsets from design locations; registration logs of field data carriers; preliminary field data acceptance certificates; final topographic and geodetic materials acceptance certificates; topographic and geodetic materials: a catalog of coordinates and an SP and RP elevation

list; a table of intersections between source lines and receiver lines; a copy of a gridless topographic map at a scale of 1:25 000 with a plotted source line and receiver line and wells in the survey area;

catalog of full coordinates and heights of all wells in the survey area; final output SPS-files (R, S, X) with shot point and receiver point coordinates; design terrain static corrections for SPs and RPs in a tabulated form and in the form of

maps of static corrections combined with the landscape map; quality maps, signal / microseismic ratios, frequency parameter in the target horizons

computed based on CSP seismic traces before field data processing and combined with the landscape map;

a preliminary 2D data cube according to seismic data field processing results in SEG-Y format;

information report on field seismic operations (both test survey and seismic acquisition) indicating, among other things, important details of the performed studies and deviations from the project and specifying the reasons for such deviations.

4.2. TimeframeG&G data collection and analysis; drafting design and estimate documentation; permits

processing; preparatory works: 2 months;

field seismic acquisition: 9 months;

acceptance of seismic acquisition results; submitting the field data to the Customer: by 1 month.

5. Distribution of the field data: The Customer – 1 original copy; Corporate data stores of Bashneft – 1 copy (duplicate); Processing center – 1 copy (duplicate). Field data shall be submitted to the Customer on external USB hard drives of not less than 2

TB.The field data shall be transferred in the formats determined by the Customer.The field seismic acquisition report shall be submitted to the Customer (1 copy).