Petroleum geology
Shadi Mohavel; Golnaz Jozanikohan; Sohaila Aslani
Abstract
The presence of clay minerals of any type, amount or distribution pattern in hydrocarbon wells causes numerous problems in the formation evaluation. In this research, 15 core samples from Asmari Formation in the Maroun Oilfield were selected in order to study the type and distribution pattern of clay ...
Read More
The presence of clay minerals of any type, amount or distribution pattern in hydrocarbon wells causes numerous problems in the formation evaluation. In this research, 15 core samples from Asmari Formation in the Maroun Oilfield were selected in order to study the type and distribution pattern of clay minerals by laboratory investigations. The XRD and microscopic results showed the studied samples consisted mainly of quartz (14.7-72.2%) and carbonate minerals (3.0-65.4%) as main constituent phases; while the plagioclase (0.0-6.7%) and clay minerals (3.3–44.5%) were identified as the main accessory minerals. In some samples, sulfide and ferrous minerals (0.0-2%) were also identified. The calculated percentage of illite in mixed-layer smectite/illite showed the diagenesis has occurred at different depths of reservoir. The SEM/EDX analysis performed on various types of clay minerals showed that kaolinite size varied from 0.7 to 6.5 μm in studied samples. In addition, Illite size ranged in our studied samples from 0.4 to 3.6 μm. Our results indicate that the clays in the Asmari Formation occur in three main patterns as dispersed, pore-bridging and pore-filling with the variation of the total amount of clay minerals, min 3.3% and max 44.5% across the length of Asmari Formation.
Economic Geology
Hasan Feizi; Sohelia Aslani; Farhang Aliyari; Abbas Bahroudi; Abdolhamid Sartipi
Abstract
The Khanik-Ghazan Titanium ore deposit is located at 82 km northwest of Urmia, northern Sanandaj-Sirjan zone. The main objective of this research is to identify potentially mineralized areas and to prepare a mineral prospectivity map in the Khanik-Ghazan deposit applying the Fuzzy Inference System (FIS). ...
Read More
The Khanik-Ghazan Titanium ore deposit is located at 82 km northwest of Urmia, northern Sanandaj-Sirjan zone. The main objective of this research is to identify potentially mineralized areas and to prepare a mineral prospectivity map in the Khanik-Ghazan deposit applying the Fuzzy Inference System (FIS). After preparing the facto maps, the main stages of the investigation comprise the preparation of fuzzy factor maps using the appropriate linguistic variables and proper membership functions, combining factor maps using the fuzzy inference (by creating a fuzzy database of If-OR rules), identification of susceptible areas, and the generation of a potential mineral map using the output closure. In this study, in order to control the accuracy of the data, we tried to apply two new integrated methods including the fuzzy logic and hierarchical analysis processes. The results obtained from these methods was confirmed and complemented by each other and demonstrated highly potential mineralized zones. This statement is validated by several investigation methods including the field surveys and evidence of 80 samples collected from rock outcrops. Based on obtained results and modelling of geophysical data, the central part of the study area was recognized for further exploration using the drillcore subsurface exploration.
