Abstract
The determination of hydrocarbon migration direction is an important part in the study of petroleum accumulation in petroliferous basins, and plays an important role in guiding oil and gas exploration activity. Despite their relatively low content in petroleum, the polar nitrogen-, sulphur-and oxygen- containing compounds (collectively referred to as NSO compounds) have great potential in characterizing the hydrocarbon migration process. A series of crude oils along hydrocarbon migration pathway were selected and analysed using GC×GC/TOFMS and GC-MS in the Wangjiagang area of the Dongying sag. Total concentration of NSO compounds and other related parameters are determined to verify the role of different parameters in indicating hydrocarbon migration. Our research result shows that the total amount of NSO compounds, 1-/3-MC ratio, 1,8-/2,7-DMC ratio, 4-/1-MDBF ratio and 2,4-/1,4-DMDBT ratio changes grandully with the increase of migration distances. Thus, these parameters can be applied as effective migration direction indicators in study area. Some other parameters may not be suitable for the identification of hydrocarbon migration direction in the study area.
Highlights
In addition to saturated hydrocarbons and aromatic compounds, crude oil contains relatively low content of polar heteroatomic compounds such as NSO compounds
We selected crude oil samples from the Wangjiagang area of Dongying sag, conducted experimental analysis of NSO compounds, and systematically analyzed the variation of relative content of NSO compounds and the typical compound parameters in the migration direction, in order to explore their application in the identification of hydrocarbon migration direction
Through geochemical analysis of crude oils in study area using GC×GC/time-of-flight mass spectrometer (TOFMS) and GC-MS instrument, we determined the relative concentration of N, S, and Ocontaining compounds and some related typical parameters
Summary
In addition to saturated hydrocarbons and aromatic compounds, crude oil contains relatively low content of polar heteroatomic compounds such as NSO compounds. The determination of the direction of hydrocarbon migration plays an important role in understanding the process and mechanism of reservoir formation, as well as the discovery of new oil and gas reservoirs. Many scholars have carried out extensive studies with different methods, and determined that the migration direction of hydrocarbons can be analyzed based on the characteristics of maturity, biomarker compounds, isotopes, and fluid inclusions [2,3]. Sulfur-containing compounds and oxygencontaining compounds which have similar structure and interaction mechanism with reservoirs can play the same role in indicating the hydrocarbon migration direction (Figure 1). We selected crude oil samples from the Wangjiagang area of Dongying sag, conducted experimental analysis of NSO compounds, and systematically analyzed the variation of relative content of NSO compounds and the typical compound parameters in the migration direction, in order to explore their application in the identification of hydrocarbon migration direction
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