H C Prospect Identification.. Important

Identification and Evaluation By RAM KRISHNA SINGH Suptdg. Geologist Basin Research Group

Energy Scenario ?? • • • •

Dependency Requirement Alternative Fear/Risk

•

Global Energy Scenario & Strategy

•

Indian Energy

HydrocarbonProspect It is referred to the prospective areas where chances of getting hydrocarbon is more.

????????? ?? Now the

question is how to know those areas where chances

Exploration for Prospect Identification •Pre-study of area •Acquisition of Expln. right •Gravity surveys •Magnetic surveys •Remote sensing Studies •Geological surveys •Geochemical surveys •Seismic surveys (All these methods

TEST WELL(WC) Positive result --Negative result

(HC)

( If dry)

Feasibility Study Exploration ----Exploitation Planning Planning

PRE-STUDY OF AREA The available prestudies carried out by different agencies are taken in to consideration before going for exploration right.

These include:-

•Studies carried out

PLORATION RIGHT

roleum Exploration License ministrative approval by Go

marcation of the area

plication for demarcated ar

quisition of exploration ense from State/Centre Gov isdiction of Government)

GRAVITY SURVEYS Based on the Newtons hypothesis, that “Energy particles in the Universe attract each other”. An instrument called “Gravity meter” which measures minute change in the vertical gravity intensity is run over the area of interest. At the same depth, the dense rock mass exerts a greater gravity ‘pull’ at the surface than a less dense rock mass.

MAGNETIC SURVEYS Aero plane is run over the basin to carryout the magnetic surveys, in which an instrument called “Magneto meter” are used to measures the changes in the vertical earth’s magnetic field. The sedimentary rocks are non magnetic and any magnetic irregularities in the area are attributed to the depth variations of basement rocks. In general the changes are the effect of the depth of original floor of the basin. From the “Magneto meter”

REMOTE SENSING A broad idea about the Geological feature can be obtained with the help of ‘Land sat Imagery’

. Lineaments . Stratigraphic boundaries . Textural

GEOLOGICAL SURVEYS Surface featureselevation, dips, strike of the outcrop, Litho logical are used to map the geological feature. • Rock type • Structure, • Depositional environment • Age of the rocks • Sedimentary thickness

GEOCHEMICAL SURVEYS Based on the assumption that HC found in an oil pool tend to migrate upwards because of their lower density some of their molecules may reach up to the surface. In some of the proven oil & gas field the surface soil sample

GEOCHEMICAL SURVEYS

Higher than average chloride content could be expected around edge of the pool left by the waters which have migrated upwards and evaporated. Methods used are:• Micro gas surveys • Micro core surveys • Microbiological • Bituminous • Sniffer surveys

FIG-1

NERATION OF HYDROCARBON ORIGINAL ORGANIC MATTER KEROGEN

MATURE KEROGEN (GRAPHITE) LOSING HYDROGEN

CRUDE OIL ( METHANE )

GAINING HYDROGEN

Hydrocarbons and Kerogen Type Oil-prone kerogens generally are made of more than 65% exinite & amorphous particles Gas-prone kerogens generally are made of less than 65% vitrinite particles

( Figure, types of petroleum generated from kerogen,). OM- Organic matter

SEISMIC SURVEYS Seismic method is based on the difference in propagating velocity of the artificially induced elastic waves through various subsurface strata. Along surveyed lines, holes are drilled which are loaded with the dynamite and exploded. Each explosion generates shock waves which travel down to the subsurface. Strata of different hardness reflect these waves back to the

Seismic Methods:Reflection Method Refraction Method Refraction Method In this method, the wave traveling along a boundary between rocks of different elastic properties is utilized. The method is primarily used as a reconnaissance tool

Reflection Method In the reflection method uses the waves reflected from such boundaries The reflection method are of principal importance. The difference between these two are the distances from shot point to the recorders. In the case of refraction shooting spacing from shot point to the recorders are

PROSPECT

“A” KP A

PROPOSAL FOR THE RELEASE OF WILDCAT LOCATION N LAKWA AREA , NORTH ASSAM SHELF. By EASTERN ONLAND BASIN STUDIES GROUP KDMIPE, Dehradun.

Summary of the Proposal For The Release of Proposal Location in Lakwa

Wildcat

Area , North Assam Shelf.

1.Particular of the proposal

1. Name of the Sub- Basin : North Assam She Basin 2.Proposing Agency : KDMIPE 3.PEL Block : Sivasagar District PEL. 4.Area/Structure : LAKWA 5.Summary Of Proposed Locations Sl.No Name of Loc. . the name Prospect

1

LAKWA

KLA

Cat / Type

B /Expl. Wildcat

T.D. (m)

5000

Reference (Lakwa 3D)

Inline

X line

IL 1220

XL 1420

Objective

Sylhet Tura Basement

2 . Geology of the area 3 . Logistics. 4 . Exploration History 5 . Tectonics of the area 6 . Present Study 7 . Depositional settings 8 . Geochemical Study Source rock

KBA

Proposal For The Release of Wildcat Location in Badarpur Area , Assam Thrust Fold Belt Assam & Assam Arakan Basin.

By EASTERN ONLAND BASIN STUDIES GROUP

Proposal For The Release of Wildcat Location Summary of the in Badarpur Area , Assam Thrust Fol ProposalBelt Assam & Assam Arakan Basin. 1. Particular of the Proposal 1. Name of the Sub- Basin

Fold Belt

:

Assam Thrust

2.Proposing Agency : KDMIPE 3.PEL Block : Badarpur District PEL. 4.Area/Structure : Badarpur Anticli Sl.No Name of Loc. Cat / T.D. Reference Objective 5.Summary Of Proposed Location. . the name Type (m) (Lakwa 3D) Prospect

1

BADARPUR

KBA

B /Expl. Wildcat

5500

Lat

Long

92 D 35 M

24 D Tipam 51M Bokabil Barail

2 . Geology of the area 3 . Logistics. 4 . Exploration History 5 . Tectonics of the area 6 . Present Study 7 . Depositional settings 8 . Geochemical Study Source rock 9 . Details of the proposal

KBA