مطالعه ژئوشیمیایی سنگ های منشا هیدروکربنی با استفاده از داده‌های پیرولیز راک-اول و مدل آرنیوس درمیدان نفتی آغاجاری

در اﯾﻦ ﺗﺤﻘﯿﻖ ، ﮐﺎرﺑﺮد ﻣﺪل آرﻧﯿﻮس ﺑﻪﻋﻨﻮان ﻣﺪل ﺳﯿﻨﺘﯿﮑﯽ ﻣﻨﺎﺳﺐ، ﺑﺮای ارزﯾﺎﺑﯽ درﺻﺪ ﻧﻔﺖ زاﯾﺶ ﺷﺪه در ﺳﻨﮓ ﻣﻨﺸﺎء اراﺋﻪ داده ﺷﺪه اﺳﺖ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر ﺳﻨﮓﻫﺎی ﻣﻨﺸﺎء اﺣﺘﻤﺎﻟﯽ ﺳﺎزﻧﺪﻫﺎی ﮔﺪوان، ﮐﮋدﻣﯽ و ﭘﺎﺑﺪه در ﻣﯿﺪان ﻧﻔﺘﯽ آﻏﺎﺟﺎری ﺑﺮای ﺑﺮرﺳﯽ ﻧﺤﻮه ﮐﺎرﺑﺮد روش آرﻧﯿﻮس ﻣﻄﺎﻟﻌﻪ ﺷﺪﻧﺪ. در اﯾﻦ ﺗﺤﻘﯿﻖ وﺿﻌﯿﺖ ﺑﻠﻮغ ﺳﻨﮓ ﻣﻨﺸﺎء و ﻫﻤﭽﻨﯿﻦ ﻧﺮخ ﺗﺒﺪﯾﻞ ﻧﻔﺖ در ﻣﯿﺪان ﻧﻔﺘﯽ آﻏﺎﺟﺎری ﺗﻌﯿﯿﻦ ﺷﺪ. ﭘﺘﺎﻧﺴﯿﻞ ﺗﻮﻟﯿﺪ ﻫﯿﺪروﮐﺮﺑﻦ ﺳﺎزﻧﺪﻫﺎی ﭘﺎﺑﺪه، ﮐﮋدﻣﯽ و ﮔﺪوان ﺑﻪ ﺗﺮﺗﯿﺐ ﺧﯿﻠﯽ ﺧﻮب، ﺧﻮب- ﺧﯿﻠﯽ ﺧﻮب و ﻓﻘﯿﺮ اﺳﺖ و ﮐﺮوژن ﻏﺎﻟﺐ در آنﻫﺎ ﺑﻪﺗﺮﺗﯿﺐ از ﻧﻮع ii و ii-iii و iii اﺳﺖ. ﺑﺮ اﺳﺎس ﻧﺘﺎﯾﺞ ﺑﺎزﺳﺎزی ﺗﺎرﯾﺨﭽﻪ ﺗﺪﻓﯿﻦ و ﻣﺪلﺳﺎزی ﺣﺮارﺗﯽ، ﺳﺎزﻧﺪ ﮐﮋدﻣﯽ ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻣﻘﺪار ﮐﺮﺑﻦ آﻟﯽ، ﭘﺘﺎﻧﺴﯿﻞ زاﯾﺶ، و ﺑﻠﻮغ ﺣﺮارﺗﯽ، ﺑﻪﻋﻨﻮان ﺳﻨﮓ ﻣﻨﺸﺎء ﻣﻨﺎﺳﺐ در ﻣﯿﺪان آﻏﺎﺟﺎری ﻣﻌﺮﻓﯽ ﺷﺪ. ﺑﺮاﺳﺎس ﻣﺪل آرﻧﯿﻮس ﻧﺮخ ﺗﺒﺪﯾﻞ در ﻣﯿﺪان ﻧﻔﺘﯽ آﻏﺎﺟﺎری ﺑﺮای ﺳﻨﮓ ﻣﻨﺸﺎء ﮐﮋدﻣﯽ، ﺑﻪ ﺣﺪاﮐﺜﺮ ﻣﻘﺪار ﺧﻮد رﺳﯿﺪه اﺳﺖ)x=100%(. ﺳﺎزﻧﺪ ﭘﺎﺑﺪه ﻧﯿﺰ دارای ﭘﺘﺎﻧﺴﯿﻞ ﻫﯿﺪروﮐﺮﺑﻦزاﯾﯽ ﺧﻮب ﺗﺎ ﻋﺎﻟﯽ ﺑﻮده و وارد ﭘﻨﺠﺮه ﻧﻔﺘﯽ ﺷﺪه اﺳﺖ وﻟﯽ ﺑﺎﺗﻮﺟﻪ ﺑﻪ ﺗﺎرﯾﺨﭽﻪ ﺗﺪﻓﯿﻦ آن، ﻧﻔﺖ ﮐﻤﯽ ﺗﺸﮑﯿﻞ داده اﺳﺖ. در ﺳﺎزﻧﺪ ﮔﺪوان ﻧﯿﺰ ﺑﻪﻋﻠﺖ ﻧﻮع ﮐﺮوژن ورژﯾﻢ ﺣﺮارﺗﯽ ﻧﺎﻣﻨﺎﺳﺐ، وارد ﭘﻨﺠﺮه ﻧﻔﺖ زاﯾﯽ ﻧﺸﺪه و دارای tti و ﻧﺮخ ﺗﺒﺪﯾﻞ ﺑﺴﯿﺎر ﭘﺎﯾﯿﻨﯽ اﺳﺖ.

Geochemical studies of hydrocarbon source rocks using RockEval Pyrolysis data with special regard to Arrhenius model‌, Ahwaz oilfield

In this study, the application of Arrhenius model as a suitable kinetic model for estimating the percent of oil produced in the source rock has been demonstrated. In this study, the Kazhdumi, Gadvan and Pabdeh formations as possible source rocks are considered to illustrate the application of the Arrhenius method, in Aghajari oilfield. In this research, the maturity of the source rock and the percentage of oil generation in the Aghajari oilfield were determined. The geochemical survey of formations showed that the Pabdeh and Kazhdumi formations are the main source rocks in the Aghajari oilfield. The results show that the hydrocarbon production potential of the Pabdeh, Kazhdumi and Gadvan formations are very good, good very good and poor, respectively. The dominant Krogene in the Pabdeh, Kazhdumi and Gadvan formations are II, IIIII and III, respectively. Based on the results of burial history reconstruction and thermal modeling, the Kazhdumi Formation is introduced in terms of carbon content, reproductive potential and thermal maturation as a suitable source rock in Aghajari oilfield. According to Arrhenius model, the Kazhdomi source Rock have a good to excellent hydrocarbon potential (X% = 100). Also, the Pabdeh Formation to be has a good to excellent hydrocarbon potential and entered the petroleum window (% X = 99/59). While, the Gadvan Formation did not entered the oil window, as well as has a lower TTI.