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

Abstract

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 words: Tarim basin, Yingjisu sag, geochemistry, biomarker, carbon isotope, oil-source correlation

CLC Number:

TE112.11

YANG Yong-cai, CHANG Xiang-chun, ZHANG Zhi-huan. The Geochemical Characteristics of Crude Oil and the Correlation of Oil Sources in Yingjisu Sag in Tarim Basin[J]. Xinjiang Petroleum Geology, 2006, 27(4): 410-413.

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