Prediction of source rock characteristics based on terpane biomarkers in crude oils: A multivariate statistical approach |
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| Institution: | 1. Department of Geology and Environment, Faculty of Science, University of Thamar, Yemen;2. Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, Egypt;1. Department of Geoscience, University of Calgary, Calgary T2N 1N4, Canada;2. School of Energy Resource, China University of Geosciences, Beijing 100083, PR China;3. Geology Scientific Research Institute of Shengli Oilfield Company, Sinopec, Dongying 257015, PR China;4. School of Geosciences, China University of Petroleum, Beijing 102200, PR China;1. Department of Physical and Geological Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE1410, Brunei Darussalam;2. Geology Department, Faculty of Science, Tanta University, Egypt;3. Department of Mathematics, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE1410, Brunei Darussalam;4. Institute of Applied Data Analytics, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE1410, Brunei Darussalam;1. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences (Wuhan), Ministry of Education, Wuhan 430074, China;2. The Fifth Oil Production Plant in Daqing Oilfield Company, PetroChina, Daqing, Heilongjiang 163000, China;3. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada |
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| Abstract: | The distributions of eight tricyclic and eight pentacyclic terpanes were determined for 216 crude oils located worldwide with subsequent simultaneous RQ-mode factor analysis and stepwise discriminate analysis for the purpose of predicting source rock features or depositional environments. Five categories of source rocks are evident: nearshore marine (i.e., paralic/deltaic); deeper-water marine; lacustrine; phosphaticrich source beds; and Ordovician age source rocks. The first two factors of the RQ-mode factor analysis describe 45 percent of the variation in the data set; the tricyclic terpanes appear to be twice as significant as pentacyclic terpanes in determining the variation among samples. Lacustrine oils are characterized by greater relative abundances of C21 diterpane and gammacerane; nearshore marine sources by C19 and C20 diterpanes and oleanane; deeper-water marine facies by C24 and C25 tricyclic and C31 plus C32 extended hopanes; and Ordovician age oils by C27 and C29 pentacyclic terpanes. Although thermal maturity trends can be observed in factor space, the trends do not necessarily obscure the source rock interpretations. Also, since bacterial degradation of crude oils rarely affects tricyclic terpanes, biodegraded oils can be used in predicting source rock features. The precision to which source rock depositional environments are determined might be increased with the addition of other biomarker (e.g., steranes) and stable isotope data using multivariate statistical techniques. |
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