Microfacies and Diagenetic Analysis of Chorgali Carbonates, Chorgali Pass, Khair-E-Murat Range: Implications for Hydrocarbon Reservoir Characterization
Journal Title: Pakistan Journal of Geology - Year 2017, Vol 1, Issue 1
Abstract
In this study integrated approaches combining field study, petrographic analysis and petrophysical analysis has been used to infer the depositional and diagenetic effects on reservoir characteristics. The exposed stratigraphic section of Chorgali Formation at its type locality was logged, sampled and petrophysical analysis of well log data from Fimkassar-02 were carried out. Three microfacies recognized from petrographic studies are: Bioclastic Wackestone-Packstone Microfacies, Mixed Bioclastuc Wackestone-Packstone Microfacies and Larger Foraminiferal Wackestone-Packstone Microfacies. The depositional texture and faunal association suggested that the microfacies represents deposition in a low energy, distally steepened ramp type of setting. Due to the deposition in low energy environment the ratio of lime mud is more than bioclasts as a result the primary pore spaces in the formation are negligible. The analysis further showed that the carbonates of Chorgali Formation was also subjected to various diagenetic changes, mainly showing the compaction, stylolitization, aragonite to calcite transformation (neomorphism), tectonically induced fracturing and calcite veins passing from marine diagenesis to meteoric diagenesis through burial diagenesis. Fracturing due to later tectonic deformation have had a major influence on porosity generation and in some cases fracturing and stylolites together have had an important effect on permeability values. The petrophysical analysis shows that the Eocene Chorgali Formation is very good reservoir with average hydrocarbon saturation of 80 %.
Authors and Affiliations
Zawar Muhammad Khan, Zain Ur Rahman, Zeeshan Khattak, Muhammad Ishfaque
Keywords
Related Articles
- EP ID EP261348
- DOI 10.26480/pjg.01.2017.18.23
- Views 107
- Downloads 0
THE USE OF STRATIGRAPHIC SECTION IN RECORDING QUAGMIRE OF INFORMATION FOR THE FLUVIAL DEPOSITIONAL ENVIRONMENT – A WORKED EXAMPLE IN DISTRICT POONCH, AZAD JAMMU AND KASHMIR, PAKISTAN
The tape-compass-clinometer method was used in gauging the thickness of stratigraphic units on topographic bevels by taping the intercepts. The dips of the beds and slope’s inclinations were determined. The appropriate f...
HYDROGEOCHEMICAL SIGNATURES AND QUALITY ASSESSMENT OF GROUNDWATER IN OKPOKO AND ENVIRONS, SOUTHEASTERN NIGERIA
This study is aimed at assessing the hydro-geochemical signatures of groundwater in Okpoko and Environs in Anambra State, Southeastern Nigeria. Fifteen groundwater samples were collected and analyzed for physicochemical,...
Microfacies and Diagenetic Analysis of Lockhart Limestone, Shah Alla Ditta Area Islamabad, Pakistan
The Larger Foraminifera made a major contribution to Paleocene and Eocene biota. The microfacies and diagenetic setting of the Paleocene Lockhart Formation were analyzed in Shah Alla Ditta area, Islamabad. The Lockhart F...
DETERMINATION OF GROUND WATER POTENTIAL BY ELECTRIC RESISTIVITY METHOD IN RAWALAKOT AND ADJOINING AREAS OF THE SUB-HIMALAYAN FOLD AND THRUST BELT OF PAKISTAN
Indian subcontinent is well respected for its growing research activity in the geosciences, particularly in circum-Himalayan earth science. Pakistan Journal of Geology (PJG) is the peer-reviewed journal of the geologists...
FORECASTING THE FUTURE PATTERN OF LAND USE AND LAND COVER CHANGE IN THE WETLAND ECOSYSTEM OF THE PORT-HARCOURT METROPOLIS
Changes in wetland area have notable effects on ecosystem processes and services. Forecasts on Land use and Land cover change have become a focal point in managing natural resources and monitoring environmental changes i...