مطالعه ژئوشيميايي سنگ هاي هيدروكربني با استفاده از داده‌هاي پيروليز راك- اول و مدل آرنيوس درميدان نفتي آغاجاري

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

در اﯾﻦ ﺗﺤﻘﯿﻖ ، ﮐﺎرﺑﺮد ﻣﺪل آرﻧﯿﻮس ﺑﻪﻋﻨﻮان ﻣﺪل ﺳﯿﻨﺘﯿﮑﯽ ﻣﻨﺎﺳﺐ، ﺑﺮاي ارزﯾﺎﺑﯽ درﺻﺪ ﻧﻔﺖ زاﯾﺶ ﺷﺪه در ﺳﻨﮓ ﻣﻨﺸﺎء اراﺋﻪ داده ﺷﺪه اﺳﺖ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر ﺳﻨﮓﻫﺎي ﻣﻨﺸﺎء اﺣﺘﻤﺎﻟﯽ ﺳﺎزﻧﺪﻫﺎي ﮔﺪوان، ﮐﮋدﻣﯽ و ﭘﺎﺑﺪه در ﻣﯿﺪان ﻧﻔﺘﯽ آﻏﺎﺟﺎري ﺑﺮاي ﺑﺮرﺳﯽ ﻧﺤﻮه ﮐﺎرﺑﺮد روش آرﻧﯿﻮس ﻣﻄﺎﻟﻌﻪ ﺷﺪﻧﺪ. در اﯾﻦ ﺗﺤﻘﯿﻖ وﺿﻌﯿﺖ ﺑﻠﻮغ ﺳﻨﮓ ﻣﻨﺸﺎء و ﻫﻤﭽﻨﯿﻦ ﻧﺮخ ﺗﺒﺪﯾﻞ ﻧﻔﺖ در ﻣﯿﺪان ﻧﻔﺘﯽ آﻏﺎﺟﺎري ﺗﻌﯿﯿﻦ ﺷﺪ. ﭘﺘﺎﻧﺴﯿﻞ ﺗﻮﻟﯿﺪ ﻫﯿﺪروﮐﺮﺑﻦ ﺳﺎزﻧﺪﻫﺎي 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 ﺑﺎزﺳﺎزي ﺗﺎرﯾﺨﭽﻪ ﺗﺪﻓﯿﻦ و ﻣﺪلﺳﺎزي ﺣﺮارﺗﯽ، ﺳﺎزﻧﺪ ﮐﮋدﻣﯽ ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻣﻘﺪار ﮐﺮﺑﻦ آﻟﯽ، ﭘﺘﺎﻧﺴﯿﻞ زاﯾﺶ، و ﺑﻠﻮغ ﺣﺮارﺗﯽ، ﺑﻪﻋﻨﻮان ﺳﻨﮓ ﻣﻨﺸﺎء ﻣﻨﺎﺳﺐ در ﻣﯿﺪان آﻏﺎﺟﺎري ﻣﻌﺮﻓﯽ ﺷﺪ. ﺑﺮاﺳﺎس ﻣﺪل آرﻧﯿﻮس ﻧﺮخ ﺗﺒﺪﯾﻞ در ﻣﯿﺪان ﻧﻔﺘﯽ آﻏﺎﺟﺎري ﺑﺮاي ﺳﻨﮓ ﻣﻨﺸﺎء ﮐﮋدﻣﯽ، ﺑﻪ ﺣﺪاﮐﺜﺮ ﻣﻘﺪار ﺧﻮد رﺳﯿﺪه اﺳﺖ)X=100%(. ﺳﺎزﻧﺪ ﭘﺎﺑﺪه ﻧﯿﺰ داراي 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 داراي TTI و ﻧﺮخ ﺗﺒﺪﯾﻞ ﺑﺴﯿﺎر ﭘﺎﯾﯿﻨﯽ اﺳﺖ

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, II-III 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.