Cementation exponent estimate in carbonate reservoirs: A new method

Abstract

There are two approaches for measuring hydrocarbon saturation: well log interpretation and usually developed formulas. Archie’s equation is one of the most fundamental equations used for water saturation calculation. Archie’s equation includes three factors: cementation factor, tortuosity and saturation exponent. Archie determines these factors based on lab results in sandstone and provides fixed value for them. Carbonate reservoirs have a variety of textures, shapes and distribution of pores; therefore, the mentioned factors, especially cementation are not considered constant. In this study, the relationship between cementation factor and density log was examined because cementation factor is defined as a parameter that has a close relationship with density. By calculating the matrix density and accordance factor between the matrix density and cementation factor from core’s analysis, a log will be generated that can estimate the variation of cementation factor around the borehole. This method is useable for calculating the cementation factor in carbonate rocks. Keywords: Cementation factor, carbonate reservoir, density, new method, exponents.

Geochemical relations among elements in stream sediment samples from Siojan Prospecting Area, Iran using geostatistical methods

“…For example, in remote sensing surveys and processing of satellite images, they are used in combination to verify the mapping performed b, Shirazy et al 2021c,d, Shirazy et al 2020. It is also used in exploratory geophysical studies to integrate information layers and determine the drilling location of boreholes (Khayer et al 2020;.…”

“…Therefore, the geochemical behavior of these two elements in relation to each other (as an exploratory key in the study region) (Shirazy et al 2019), is important. In order to investigate the geochemical behavior of Cu and Co elements, K-Means clustering method was used Khayer et al 2020, Shirazy et al 2022c. Initially, the data set was categorized into different classes using the K-Means algorithm.…”

A Review of Mineralization of Rare Earth Elements in Iran

“…In the Bafgh region, due to the presence of apatite iron deposits, there are rich sources of rare earth elements. [12][13][14][15] According to the studies of Moradkhani et al (2015), the following results were obtained on the Narigan exploration area, located in the southern part of the mining area of rare Esfordi soil elements and black spot (which has been identified as rich in these elements). In the Narigan region, the presence of semi-deep granitoid intrusion mass called Narigan granite as the source of mineralisation and joint system and fault system and many joints around the mass has created suitable conditions for forming metal veins.…”