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Carbonate Reservoir Quality Variations in Basins with a Variable Sediment Influx: A Case Study from the Balkassar Oil Field, Potwar, Pakistan
[Image: see text] The carbonate reservoir quality is strongly reliant on the compaction process during sediment burial and other processes such as cementation and dissolution. Porosity and pore pressure are the two main factors directly affected by mechanical and chemical compactions. Porosity reduc...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9893761/ https://www.ncbi.nlm.nih.gov/pubmed/36743037 http://dx.doi.org/10.1021/acsomega.2c06773 |
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author | Amjad, Muhammad Raiees Ehsan, Muhsan Hussain, Muyyassar Al-Ansari, Nadhir Rehman, Abdul Naseer, Zohaib Ejaz, Muhammad Nauman Baouche, Rafik Elbeltagi, Ahmed |
author_facet | Amjad, Muhammad Raiees Ehsan, Muhsan Hussain, Muyyassar Al-Ansari, Nadhir Rehman, Abdul Naseer, Zohaib Ejaz, Muhammad Nauman Baouche, Rafik Elbeltagi, Ahmed |
author_sort | Amjad, Muhammad Raiees |
collection | PubMed |
description | [Image: see text] The carbonate reservoir quality is strongly reliant on the compaction process during sediment burial and other processes such as cementation and dissolution. Porosity and pore pressure are the two main factors directly affected by mechanical and chemical compactions. Porosity reduction in these carbonates is critically dependent on the overburden stress and subsidence rate. A variable sediment influx in younger basins may lead to changes in the reservoir quality in response to increasing lithostatic pressure. Deposition of molasse sediments as a result of the Himalayan orogeny caused variations in the sedimentation influx in the Potwar Basin of Pakistan throughout the Neogene times. The basic idea of this study is to analyze the carbonate reservoir quality variations induced by the compaction and variable sediment influx. The Sakesar Limestone of the Eocene age, one of the proven carbonate reservoirs in the Potwar Basin, shows significant changes in the reservoir quality, specifically in terms of porosity and pressure. A 3D seismic cube (10 km(2)) and three wells of the Balkassar field are used for this analysis. To determine the vertical and lateral changes of porosity in the Balkassar area, porosity is computed from both the log and seismic data. The results of both the data sets indicate 2–4% porosities in the Sakesar Limestone. The porosity reduction rate with respect to the lithostatic pressure computed with the help of geohistory analysis represents a sharp decrease in porosity values during the Miocene times. Pore pressure predictions in the Balkassar OXY 01 well indicate underpressure conditions in the Sakesar Limestone. The Eocene limestones deposited before the collision of the Indian plate had enough time for fluid expulsion and show underpressure conditions with high porosities. |
format | Online Article Text |
id | pubmed-9893761 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-98937612023-02-03 Carbonate Reservoir Quality Variations in Basins with a Variable Sediment Influx: A Case Study from the Balkassar Oil Field, Potwar, Pakistan Amjad, Muhammad Raiees Ehsan, Muhsan Hussain, Muyyassar Al-Ansari, Nadhir Rehman, Abdul Naseer, Zohaib Ejaz, Muhammad Nauman Baouche, Rafik Elbeltagi, Ahmed ACS Omega [Image: see text] The carbonate reservoir quality is strongly reliant on the compaction process during sediment burial and other processes such as cementation and dissolution. Porosity and pore pressure are the two main factors directly affected by mechanical and chemical compactions. Porosity reduction in these carbonates is critically dependent on the overburden stress and subsidence rate. A variable sediment influx in younger basins may lead to changes in the reservoir quality in response to increasing lithostatic pressure. Deposition of molasse sediments as a result of the Himalayan orogeny caused variations in the sedimentation influx in the Potwar Basin of Pakistan throughout the Neogene times. The basic idea of this study is to analyze the carbonate reservoir quality variations induced by the compaction and variable sediment influx. The Sakesar Limestone of the Eocene age, one of the proven carbonate reservoirs in the Potwar Basin, shows significant changes in the reservoir quality, specifically in terms of porosity and pressure. A 3D seismic cube (10 km(2)) and three wells of the Balkassar field are used for this analysis. To determine the vertical and lateral changes of porosity in the Balkassar area, porosity is computed from both the log and seismic data. The results of both the data sets indicate 2–4% porosities in the Sakesar Limestone. The porosity reduction rate with respect to the lithostatic pressure computed with the help of geohistory analysis represents a sharp decrease in porosity values during the Miocene times. Pore pressure predictions in the Balkassar OXY 01 well indicate underpressure conditions in the Sakesar Limestone. The Eocene limestones deposited before the collision of the Indian plate had enough time for fluid expulsion and show underpressure conditions with high porosities. American Chemical Society 2023-01-19 /pmc/articles/PMC9893761/ /pubmed/36743037 http://dx.doi.org/10.1021/acsomega.2c06773 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Amjad, Muhammad Raiees Ehsan, Muhsan Hussain, Muyyassar Al-Ansari, Nadhir Rehman, Abdul Naseer, Zohaib Ejaz, Muhammad Nauman Baouche, Rafik Elbeltagi, Ahmed Carbonate Reservoir Quality Variations in Basins with a Variable Sediment Influx: A Case Study from the Balkassar Oil Field, Potwar, Pakistan |
title | Carbonate Reservoir
Quality Variations in Basins with
a Variable Sediment Influx: A Case Study from the Balkassar Oil Field,
Potwar, Pakistan |
title_full | Carbonate Reservoir
Quality Variations in Basins with
a Variable Sediment Influx: A Case Study from the Balkassar Oil Field,
Potwar, Pakistan |
title_fullStr | Carbonate Reservoir
Quality Variations in Basins with
a Variable Sediment Influx: A Case Study from the Balkassar Oil Field,
Potwar, Pakistan |
title_full_unstemmed | Carbonate Reservoir
Quality Variations in Basins with
a Variable Sediment Influx: A Case Study from the Balkassar Oil Field,
Potwar, Pakistan |
title_short | Carbonate Reservoir
Quality Variations in Basins with
a Variable Sediment Influx: A Case Study from the Balkassar Oil Field,
Potwar, Pakistan |
title_sort | carbonate reservoir
quality variations in basins with
a variable sediment influx: a case study from the balkassar oil field,
potwar, pakistan |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9893761/ https://www.ncbi.nlm.nih.gov/pubmed/36743037 http://dx.doi.org/10.1021/acsomega.2c06773 |
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