Geochemical Feature of Low-Mature Crude Oil in Sub-Sag of Guanzhen in Subei Basin

Abstract

Abstract: The sub-sag of Guanzhen is located in middle part of Hongze sag in Yanfu depression, Subei basin. Its low-mature crude oil is characterized by the "four highs and one low" physical properties: the middle-higher crude density, high viscosity, high solidification point, high paraffin content and low sulfur content. The oils in wells in this sub-sag are not subjected to biodegradation, with the typical low-mature oil feature of their group compositions, which are proved by low degree of the thermal evolution data of light hydrocarbons including sterane, low m(Pr)/m(Ph) and high m(Ph)/m(nC18) ratios. The m(Pr)/m(Ph) ratio indicates the crude is product from the reductingstrong reducting environment and dominated by sapropelic kerogen. The high paraffin content of crude oils is related to those that a part of humic kerogen formed oil in low-mature stage and botryococcane in saprogelic kerogen early formed oil.

Key words: Subei basin, Hongze sag, geochemistry, Paleogene, low-mature oil

CLC Number:

TE112，113

YANG Bin, LIANG Xing, MA Xiao-xiang, ZHOU Songyuan, LOU Ji-sheng, CAI Ya-ping. Geochemical Feature of Low-Mature Crude Oil in Sub-Sag of Guanzhen in Subei Basin[J]. Xinjiang Petroleum Geology, 2008, 29(5): 553-556.

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