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The Geochemical Characteristics of Crude Oil and the Correlation of Oil Sources in Yingjisu Sag in Tarim Basin

Zhihuan Zhang

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Abstract

The geochemical characteristics of crude oil and source rocks in Yinjisu sag are summarized. The genetic types of crude oil are classified, and the correlations between oil-oil and oil-source are conducted by applying light hydrocarbons, biomarkers, and carbon isotopes. The study shows that palaeosalinity of Jurassic carbonaceous mudstone and coal deposit of Jurassic in Huayingcan-1 Well are low in both palaeo-salinity and maturity, not reaching the mature threshold. Crude oil of Jurassic in Yingnan-2 Well is in stage of low maturity, mainly coming from low-salinity and oxidizing Mesozoic humic source rocks, with property of mixed sources. And oil of Jurassic in Longkou-1 Well is originated from hypersaline and anoxic reducing Cambrian-Lower Ordovician sapropelic source rocks. Oils of Jurassic in Huayingcan-1 Well, Cambrian in Tadong-2 Well and Jurassic in Longkou-1 Well are the same source in stage of thermal maturity.

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What this paper is about

The geochemical characteristics of crude oil and source rocks in Yinjisu sag are summarized. The genetic types of crude oil are classified, and the correlations between oil-oil and oil-source are conducted by applying light hydrocarbons, biomarkers, and carbon isotopes. The study shows that palaeosalinity of Jurassic carbonaceous mudstone and coal deposit of Jurassic in Huayingcan-1 Well are low in both palaeo-salinity and maturity, not reaching the mature threshold. Crude oil of Jurassic in Yingnan-2 Well is in stage of low maturity, mainly coming from low-salinity and oxidizing Mesozoic humic source rocks, with property of mixed sources. And oil of Jurassic in Longkou-1 Well is originated from hypersaline and anoxic reducing Cambrian-Lower Ordovician sapropelic source rocks. Oils of Jurassic in Huayingcan-1 Well, Cambrian in Tadong-2 Well and Jurassic in Longkou-1 Well are the same source in stage of thermal maturity.

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Available abstract

The geochemical characteristics of crude oil and source rocks in Yinjisu sag are summarized. The genetic types of crude oil are classified, and the correlations between oil-oil and oil-source are conducted by applying light hydrocarbons, biomarkers, and carbon isotopes. The study shows that palaeosalinity of Jurassic carbonaceous mudstone and coal deposit of Jurassic in Huayingcan-1 Well are low in both palaeo-salinity and maturity, not reaching the mature threshold. Crude oil of Jurassic in Yingnan-2 Well is in stage of low maturity, mainly coming from low-salinity and oxidizing Mesozoic humic source rocks, with property of mixed sources. And oil of Jurassic in Longkou-1 Well is originated from hypersaline and anoxic reducing Cambrian-Lower Ordovician sapropelic source rocks. Oils of Jurassic in Huayingcan-1 Well, Cambrian in Tadong-2 Well and Jurassic in Longkou-1 Well are the same source in stage of thermal maturity.

Key concepts: Source rock, Geology, Maturity (psychological), Ordovician, Geochemistry, Tarim basin, Anoxic waters, Mesozoic

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