scholarly journals Biostratigraphy, microfacies and sequence stratigraphic analysis of the Chorgali Formation, Central Salt Range, northern Pakistan

2021 ◽  
Author(s):  
Kamran Mirza ◽  
Nosheen Akhter ◽  
Ayesha Ejaz ◽  
Syeda Fakiha Ali Zaidi
Keyword(s):  
Northern Pakistan ◽  
Sequence Stratigraphic ◽  
Stratigraphic Analysis ◽  
Salt Range

Application of Seismic Sequence Stratigraphy for Delineating Mishrif Prospects in Western Onshore, Abu Dhabi, UAE

2021 ◽  
Author(s):  
Subrata Chakraborty ◽  
Monica Maria Mihai ◽  
Nacera Maache ◽  
Gabriela Salomia ◽  
Abdulla Al Blooshi ◽  
...  
Keyword(s):  
Abu Dhabi ◽  
Seismic Sequence ◽  
Large Area ◽  
Oil Accumulation ◽  
Sequence Stratigraphic ◽  
Stratigraphic Analysis ◽  
Seismic Sequence Stratigraphy ◽  
Well Data ◽  
Seismic Reflectors ◽  
Sweet Spots

Abstract In Abu Dhabi, the Mishrif Formation is developed in the eastern and western parts conformably above the Shilaif Formation and forms several commercial discoveries. The present study was carried out to understand the development of the Mishrif Formation over a large area in western onshore Abu Dhabi and to identify possible Mishrif sweet spots as future drilling locations. To achieve this objective, seismic mapping of various reflectors below, above, and within the Mishrif Formation was attempted. From drilled wells all the available wireline data and cores were studied. Detailed seismic sequence stratigraphic analysis was carried out to understand the evolution of the Mishrif Formation and places where the good porosity-permeability development and oil accumulation might have happened. The seismic characters of the Mishrif Formation in dry and successful wells were studied and were calibrated with well data. The Mishrif Formation was deposited during Late Cretaceous Cenomanian time. In the study area it has a gross thickness ranging from 532 to 1,269 ft as derived from the drilled wells; the thickness rapidly decreases eastward toward the shelf edge and approaching the Shilaif basin. The Mishrif was divided into three third-order sequences based on core observations from seven wells and log signatures from 25 wells. The bottom-most sequence Mishrif 1.0 was identified is the thickest unit but was also found dry. The next identified sequence Mishrif 2.0 was also dry. The next and the uppermost sequence identified as Mishrif 3.0 shows a thickness from 123 to 328 ft. All the tested oil-bearing intervals lie within this sequence. This sequence was further subdivided into three fourth-order sequences based on log and core signatures; namely, Mishrif 3.1, 3.2, and 3.3. In six selected seismic lines of 181 Line Km (LKM) cutting across the depositional axis, seismic sequence stratigraphic analysis was carried out. In those sections all the visible seismic reflectors were picked using a stratigraphic interpretation software. Reflector groups were made to identify lowstand systems tract, transgressive systems tract, maximum flooding surface, and highstand systems tract by tying with the observations of log and core at the wells and by seismic signature. Wheeler diagrams were generated in all these six sections to understand the lateral disposition of these events and locales of their development. Based on stratigraphic analysis, a zone with likely grainy porous facies development was identified in Mishrif 3.0. Paleotopography at the top of Mishrif was reconstructed to help delineate areas where sea-level fall generated leaching-related sweet spots. Analysis of measured permeability data identified the presence of local permeability baffles affecting the reservoir quality and hydrocarbon accumulation. This study helped to identify several drilling locations based on a generic understanding of the Mishrif Formation. Such stratigraphic techniques can be successfully applied in similar carbonate reservoirs to identify the prospect areas.

scholarly journals Sequence Stratigraphic Analysis from Well Logs of an X-Field, Niger Delta, Nigeria

2016 ◽  
Vol 6 (2) ◽  
pp. 80-90
Author(s):  
Godwin Omokenu Emujakporue ◽  
Alphonsus Joseph Eyo
Keyword(s):  
Niger Delta ◽  
Well Logs ◽  
Sequence Stratigraphic ◽  
Stratigraphic Analysis

Sequence stratigraphic analysis of Eocene Rock Strata, Offshore Indus, southwest Pakistan

2016 ◽  
Vol 37 (3) ◽  
pp. 207-228 ◽  
Author(s):  
Natasha Khan ◽  
Khaista Rehman ◽  
Sajjad Ahmad ◽  
Jamil Khokher ◽  
M. Iqbal Hajana ◽  
...  
Keyword(s):  
Sequence Stratigraphic ◽  
Stratigraphic Analysis ◽  
Rock Strata
Sign in / Sign up

Export Citation Format

Share Document