Geochemical Characteristics of Crude Oil and Oil-Source Correlation in Halahatang Sag

摘要/Abstract

摘要： The Halahatang sag in the Tarim basin is abundant in petroleum resources with the proved reserves over one hundred million tons. In order to confirm the major source rocks of Ordovician reservoirs in the Halahatang sag, systematic geochemical analyses are performed for oil samples from Well ZS1 and Halahatang sag and characteristics of light hydrocarbons and biomarkers are further studied. The results show that the Halahatang oil samples are characterized by high content of n-alkanes and poor content of arene, which are similar to those of oil samples from Well ZS1, indicating the typical sapropelic origin. The aryl isoprenoid compounds detected in the oil samples from the Halahatang sag are the markers for strong reducing sedimentary environment. Combined with the characteristics of source rocks and geological settings in the Halahatang sag, it is considered that the marine oil in the study area mainly originates from the Cambrian to Lower Ordovician source rocks instead of the Middle to Upper Ordovician source rocks.

关键词: Tarim basin, Halahatang sag, Ordovician reservoir, geochemical characteristic, oil-source correlation, gammacerane

Abstract: The Halahatang sag in the Tarim basin is abundant in petroleum resources with the proved reserves over one hundred million tons. In order to confirm the major source rocks of Ordovician reservoirs in the Halahatang sag, systematic geochemical analyses are performed for oil samples from Well ZS1 and Halahatang sag and characteristics of light hydrocarbons and biomarkers are further studied. The results show that the Halahatang oil samples are characterized by high content of n-alkanes and poor content of arene, which are similar to those of oil samples from Well ZS1, indicating the typical sapropelic origin. The aryl isoprenoid compounds detected in the oil samples from the Halahatang sag are the markers for strong reducing sedimentary environment. Combined with the characteristics of source rocks and geological settings in the Halahatang sag, it is considered that the marine oil in the study area mainly originates from the Cambrian to Lower Ordovician source rocks instead of the Middle to Upper Ordovician source rocks.

Key words: Tarim basin, Halahatang sag, Ordovician reservoir, geochemical characteristic, oil-source correlation, gammacerane

LI Zhongxuan, XU Zhiming, WANG Zhaoming, CHEN Yunchuan, XIAO Zhongyao. Geochemical Characteristics of Crude Oil and Oil-Source Correlation in Halahatang Sag[J]. 新疆石油地质, 2016, 37(zk(English) ): 66-72.

LI Zhongxuan, XU Zhiming, WANG Zhaoming, CHEN Yunchuan, XIAO Zhongyao. Geochemical Characteristics of Crude Oil and Oil-Source Correlation in Halahatang Sag[J]. Xinjiang Petroleum Geology, 2016, 37(zk(English) ): 66-72.

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