Quantifying Source Rock Maturity From Logs: How To Get More Than TOC From Delta Log R

LeCompte, Brian; Hursán, Gábor

doi:10.2118/133128-ms

Cited by 25 publications

(8 citation statements)

References 2 publications

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“…Source rock refers to an organic-rich fine-grained sedimentary rock that can produce hydrocarbons due to thermal maturation (Rezaee, 2002). Lecompte, Hursan, and Hughes (2010) mentioned that thermal maturity is considered the primary factor that defined what the source rock can produce. Rock-Eval pyrolysis is used as a standard method in petroleum exploration to determine the thermal maturation of kerogen (Lafargue, Marquis, & Pillot, 1998).…”

Section: Introductionmentioning

confidence: 99%

Source rock evaluation of the Central Gulf of Suez, Egypt: A 1D basin modelling and petroleum system analysis

et al. 2021

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Geochemical studies were applied to evaluate the possible source rocks of Cretaceous-Eocene formations in the October oil field, including pyrolysis analysis data such as total organic carbon (TOC %), generating source potential (S2), production index (PI), oxygen, and hydrogen indices (OI, HI) and (Tmax). Three source rocks are characterized by fair to good and very good TOC%, which are Thebes, Duwi, and Abu Qada formations with kerogen type I and type II, respectively, and some samples are in the type III region reflecting the degree of maturation and can generate oil and gas. 1D basin models were constructed for five wells to simulate the multi-tectonic phases and multiple burial histories, migration path, and event chart in the study area. The sedimentation rates from Cretaceous to Palaeocene age are characterized by low burial rate sedimentation, low to medium in the Eocene age, and high burial rate and rapid sedimentation in the Miocene and post-Miocene age. The petroleum system of the October oil field was studied, and two petroleum systems can be recognized, according to the integration studies between the source rock evaluation and petroleum basin modelling.

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Section: Introductionmentioning

confidence: 99%

Source rock evaluation of the Central Gulf of Suez, Egypt: A 1D basin modelling and petroleum system analysis

et al. 2021

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“…Later, Zhao et al (2007) introduced a method for assessment of thermal maturity from well logs analysis. Lecompte and Hursan (2010) re-arranged the delta Log R equation (Passey et al, 1990) to solve for the level of maturity and correlated it to vitrinite reflectance. Afterward, they introduced a method to determine kerogen density from log and core data.…”

Section: Introductionmentioning

confidence: 99%

Estimation of vitrinite reflectance from well log data

Kadkhodaie

Rezaee

2017

Journal of Petroleum Science and Engineering

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Vitrinite reflectance (VR) data provide important information for thermal maturity assessment and source rock evaluation. The current study introduces a practical method for vitrinite reflectance determination from sonic and resistivity logs. The main determinant factor of the method is ΔRRS which is defined as the separation between cumulative frequency values of resistivity ratio (RR) and sonic log data. The values of ΔRRS range from-1 at ground level to +1 at bottom hole. The crossing point depth of the DT and RR cumulative frequency curves, where ΔRRS=0, indicates the onset of oil generation window. From the surface (ground level) to the crossing point depth ΔRRS takes negative values indicating organic material diagenesis window. Below the crossing point depth ΔRRS turns into positive values showing thermally-mature organic matter within the catagenesis window. Vitrinite reflectance measurements revealed strong exponential relationships with the calculated ΔRRS data. Accordingly, a new calibration chart was proposed for VR estimation based on ΔRRS data. Finally, an equation is derived for vitrinite reflectance estimation from ΔRRS and geothermal gradient. The proposed equation works well in the event of having limited VR calibration data.

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“…Therefore, to identify a region of hydrocarbon, it is necessary to investigate the source rock and its characteristics first. Thermal maturity is the primary factor that determines whether a source rock can produce oil, gas, or condensate [2]. In order to evaluate the source rocks various laboratory methods are used.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of organic matters, hydrocarbon potential and thermal maturity of source rocks based on geochemical and statistical methods: Case study of source rocks in Ras Gharib oilfield, central Gulf of Suez, Egypt

Nady

Ramadan

Hammad

et al. 2015

Egyptian Journal of Petroleum

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In this study, we apply geochemical and statistical analyses for evaluating source rocks in Ras Gharib oilfield. The geochemical analysis includes pyrolysis data as total organic carbon (TOC%), generating source potential (S2), production index (PI), oxygen and hydrogen indices (OI, HI) and (Tmax). The results show that the Cretaceous source rocks are poor to good source rocks with kerogen of type III and have the capability of generating gas while, the Miocene source rocks are good to excellent source rocks with kerogen of type III-II and type II and have the capability of generating oil and gas. The analyzed data were treated statistically to find some factors, clusters, and relations concerning the evaluation of source rocks. These factors can be classified into organic richness and type of organic matter, hydrocarbon potentiality and thermal maturity. In addition, cluster analysis separated the source rocks in the study area into two major groups. (1) Source rocks characterized by HI >300 (mg/g), TOC from 0.76 to 11.63 wt%, S1 from 0.44 to 9.49 (mg/g) and S2 from 2.59 to 79.61 (mg/g) indicating good to excellent source rocks with kerogen of type III-II and type II and are capable of generating oil and gas. (2) Source rocks characterized by HI <300 (mg/g), TOC from 0.31 to 2.07 wt%, S1 from 0.17 to 1.29 (mg/g) and S2 from 0.31 to 3.34 (mg/g) indicating poor to good source rocks with kerogen of type III and are capable of generating gas. Moreover, Pearson's correlation coefficient shows a strong positive correlation between

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Quantifying Source Rock Maturity From Logs: How To Get More Than TOC From Delta Log R

Cited by 25 publications

References 2 publications

Source rock evaluation of the Central Gulf of Suez, Egypt: A 1D basin modelling and petroleum system analysis

Source rock evaluation of the Central Gulf of Suez, Egypt: A 1D basin modelling and petroleum system analysis

Estimation of vitrinite reflectance from well log data

Evaluation of organic matters, hydrocarbon potential and thermal maturity of source rocks based on geochemical and statistical methods: Case study of source rocks in Ras Gharib oilfield, central Gulf of Suez, Egypt

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