烃源岩与原油中轻馏分烃的对比——以胜利油田东营、沾化凹陷为例

doi:10.11743/ogg20130101

Abstract

Abstract:

An in-house designed and manufactured on-line analyzing device consisting of vacuum ball milling,heating releasing,helium purging and liquid nitrogen trapping was used to study the light hydrocarbon fractions(C₅-C₁₃) of scattered organic matter in source rocks.Ten source rock samples and saturated hydrocarbon samples of their extracts as well as 15 oil samples from the Eocene Shahejie Formation in Dongying and Zhanhua depressions of Shengli oilfield were first analyzed by GC and GC-MS.Then oil-source and oil-oil correlation and classification of light hydrocarbon(nC₆-nC₉) were performed.The results in combination with the biomarkers and geological background were finally used to perform comprehensive study,leading to four conclusions.(a)The light hydrocarbons in the scattered organic matter of the source rocks in the upper Es⁴,lower Es³ and Es¹ are different in chemical compositions.(b)The chemical components of C₅-C₁₃ light hydrocarbons are related to the salinity of water column during deposition,which is consistent with that of the oils.(c)Among the 15 oil samples,8 samples contain light hydrocarbons mostly originated from the lower Es³ source rocks,while 4 samples from the upper Es⁴ source rocks,the rest are mixed oil.(d)The on-line device provided a new way for study the characteristics of light hydrocarbons(C₅-C₁₃)in the scattered organic matter in source rocks and their application in petroleum geochemistry.

Key words: light hydrocarbon, oil-source correlation, source rock, Dongyiny depression, Zhanhua depression, Shengli oilfield

CLC Number:

TE132

Wang Peirong, Xu Guanjun, Zhang Dajiang, Xiao Tingrong, Ren Dongling. Correlation of light hydrocarbons between source rock and crude oil: an example from Dongying and Zhanhua depressions in Jiyang subbasin, Bohai Bay Basin[J]. Oil & Gas Geology, 2013, 34(1): 1-10.

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Correlation of light hydrocarbons between source rock and crude oil: an example from Dongying and Zhanhua depressions in Jiyang subbasin, Bohai Bay Basin

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