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Petroleum System of Srikail Gas Field Using Sequence Stratigraphy

Md. Imam Sohel Hossain
Department of Geology, University of Dhaka, Dhaka-1000, Bangladesh

A. S. M. Woobaidullah
Department of Geology, University of Dhaka, Dhaka-1000, Bangladesh

Md. Jamilur Rahman
Department of Geology, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

A sequence stratigraphic analysis was carried out on the sedimentary packages of parts of the Bengal Basin hydrocarbon province. This paper focuses on the identification of petroleum system of Srikail Gas Field within the eastern folded belt of the Bengal basin using sequence stratigraphic concept. Three strikes and five dip seismic lines are used in this work and data analysis is done using Petrel 2015 software. Seismic line-2 (SK-2) of Srikail is good in resolution and is used here only for identifying potential petroleum systems. Seven sequence boundaries were identified on the basis of on lap and reflection truncation. The result of the interpreted sequence boundary has revealed that all the elements which are required to generate a potential prospect are present in the study area. Fine-grained sediments deposited during the rising and lowering of sea level might act as a potential source rock. Time contour maps of the study area have revealed that the NWSE trending anticlinal Srikail structure is largely affected by shale filled channel in the crystal and western flank. The channel-filled shale is later acting as a seal on the north and western part of the structure. Erosional remnants truncated against shale fill canyon is acting as prospective reservoirs in the Srikail gas field. The NW-SE trending anticlinal structure and shale fill canyon help this sand as potential traps for hydrocarbon accumulation. Hence the petroleum system of the study area becomes very prospective in terms of hydrocarbon accumulation.

Keywords: Sequence boundary, Erosional remnants, Incised valley, Reservoir, Trap, seal

Location: Srikail Gas Field, Bangladesh

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Non-commodity: Carbon sequestration

Objectives:

The objectives of this work are to determine the major chronostratigraphic surfaces and units in the study area, using the available seismic data and identify sequence boundary associated with potential hydrocarbon in order to reduce the overall exploration risk.

Methodology:

Seismic data are used in this work and the data analysis is done using Petrel 2015 Software. Three strike lines and five dip lines of 2D seismic data are used. The seismic data analysis is done by the following procedure (Van Wagoner et al. 1988): 1. Mis-tie correction which includes seismic to seismic tie using bulk time shift and seismic to well tie 2. Sequence analysis 3. Selecting reflectors 4. Picking horizons 5. Synthetic seismogram preparation 6. Data integration Mis-ties commonly occur when data of different phases, rather than uniformly zerophase data, are interpreted together, or data that have different data corrections are tied (Badley 1985). Mis-ties are corrected by seismic to seismic tie using bulk time shift and seismic to well tie in this work. Followed by the mis-tie correction, horizon interpretation work started. A horizon is an event, a reflection, in the seismic data. It is the goal of seismic interpretation. Horizons are picked using well tops guidance. Seismic sequence analysis defines the genetic reflection packages referred to as seismic sequences and seismic systems tracts by identifying discontinuities on the basis of reflection termination patterns. Two patterns, onlap and downlap, occur above the discontinuity; three patterns, truncation, toplap, and apparent truncation, occur below the discontinuity. Sequence boundaries are characterized by regional onlap and truncation (Najman 2012). Sequence analysis is done in this work to identify the potential petroleum system. After completion of seismic interpretation time surfaces were generated and were used to identify reservoirs and seal rock as well as trapping mechanism (Keary and Brooks 1984).

Source of Information: Bangladesh J. Sci. Res. 30(1&2): 1-9, 2017 (December)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results of interpreted sequence boundary have revealed that erosional remnant truncated against shale fill canyon is acting as prospective reservoirs in the Srikail gas field. The channel filled shale identified from low amplitude reflections is later acting as a seal in the study area. The NE-SW trending anticlinal structure and shale fill canyon is playing a crucial role in potential traps for hydrocarbon accumulation. Though the source rock and migration path are not confidently analyzed by this 2D low-resolution data, a reservoir with a sealing and trapping system is easily identified by sequence stratigraphic analysis.

Knowledge Management: Journal