Application of Well Logging Data to Determine Petrophysical Properties of Shiranish Formation

Chalang NAWZAD MOHAMED TAHER

Bachelor's thesis

ABSTRACT,INTRODUCTION,LITHOLOGICAL ASPECT AND SHALE CONTENT,POROSITY ESTIMATION AND POROSITY UNITS,CONCLUSION AND RECOMMENDATIONS,Reference

Application of Well Log Data to Characterize Petrophysical properties of Shiranish Formation, Kurdistan Region, Iraq

Abstract:

ABSTRACT The properties can be estimated using well logs such as rocks resistivity, sonic velocity, density. The recorded data can then be interpreted to determine the lithology and porosity of the penetrated formation. Well logs are also used for determining the upper and lower contact of formation. The main objective of this study is to determine the physical properties of the formation (reservoir), Lithology, shale volume, and porosity. Due to the lack of modern equipment like the Borehole Televiewer and rock samples, conventional well logging methods are essential in the identification of petrophysical parameters and essentially help in reservoir characterization and enhancement. In this study, the Liassic Shiranish Formation in the Tawke oil field, northern Iraq, was used for its petrophysical features. The Neutron-Density Crossplot to find lithology, Gamma ray to determine shale volume, Sonic log, and density log are used to find porosity and fracture porosity are just a few of the diverse methodologies that have been combined. The Shiranish Formation has established good porosity and fracture porosity with Porosity 20%- 25% of maximum value from density log and sonic log respectively. According to the gamma ray, the formation has a low gamma ray which is around 20 API and low shale volume in the first zone, but for the second zone the volume of shale increases to 28% and possibly the formation is not pure and includes clay minerals, and also the gamma ray is around 50 API. The data shows two zones, the first of which has a range between 2692 and 2625 meters, and the second of which is starting. After careful consideration and understanding from the well logging data, we concluded that the formation is a low shale formation and has a good quality. In the first zone, the porosity reaches 20%, which is a good quality for the formation. However, in the second zone, according to the caliper log, which shows wash out around the well and the range of porosity is too great, we cannot trust the data in this area.

Abstract:

ABSTRACT The properties can be estimated using well logs such as rocks resistivity, sonic velocity, density. The recorded data can then be interpreted to determine the lithology and porosity of the penetrated formation. Well logs are also used for determining the upper and lower contact of formation. The main objective of this study is to determine the physical properties of the formation (reservoir), Lithology, shale volume, and porosity. Due to the lack of modern equipment like the Borehole Televiewer and rock samples, conventional well logging methods are essential in the identification of petrophysical parameters and essentially help in reservoir characterization and enhancement. In this study, the Liassic Shiranish Formation in the Tawke oil field, northern Iraq, was used for its petrophysical features. The Neutron-Density Crossplot to find lithology, Gamma ray to determine shale volume, Sonic log, and density log are used to find porosity and fracture porosity are just a few of the diverse methodologies that have been combined. The Shiranish Formation has established good porosity and fracture porosity with Porosity 20%- 25% of maximum value from density log and sonic log respectively. According to the gamma ray, the formation has a low gamma ray which is around 20 API and low shale volume in the first zone, but for the second zone the volume of shale increases to 28% and possibly the formation is not pure and includes clay minerals, and also the gamma ray is around 50 API. The data shows two zones, the first of which has a range between 2692 and 2625 meters, and the second of which is starting. After careful consideration and understanding from the well logging data, we concluded that the formation is a low shale formation and has a good quality. In the first zone, the porosity reaches 20%, which is a good quality for the formation. However, in the second zone, according to the caliper log, which shows wash out around the well and the range of porosity is too great, we cannot trust the data in this area.

Keywords

shiranish formation, well logging, reservoir characteristics, porosity, fracture porosity.

Language used: English

Date on which the thesis was submitted / produced: 8. 5. 2023

Thesis defence

• Supervisor: prof. Mgr. Ondřej Bábek, Dr.

Palacký University Olomouc

Faculty of Science

Bachelor programme / field:
Petroleum Engineering / Petroleum Engineering