Volume 39 Issue 6
Nov.  2020
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Han Jinhu, Guo Xiaowen, Wang Xuejun, Wang Yongshi, He Sheng. Distribution rule and main controlling factors of crude oil from different sources in Bonan Sag[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 83-92. doi: 10.19509/j.cnki.dzkq.2020.0607
Citation: Han Jinhu, Guo Xiaowen, Wang Xuejun, Wang Yongshi, He Sheng. Distribution rule and main controlling factors of crude oil from different sources in Bonan Sag[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 83-92. doi: 10.19509/j.cnki.dzkq.2020.0607

Distribution rule and main controlling factors of crude oil from different sources in Bonan Sag

doi: 10.19509/j.cnki.dzkq.2020.0607
  • Received Date: 27 Feb 2020
  • In order to reveal the distribution rule and main controlling factors of crude oil from the Es3 and Es4 source rocks in Bonan Sag, group separation, gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) and other means were used to analyze the geochemical characteristics of crude oil and source rock, carry out the genetic classification of crude oil, determine the distribution rule of crude oil from different sources, and then explore the main factors of oil distribution.The results show that the contribution of source rocks in Es3 and Es4 intervals to crude oil is different.Based on the biomarker parameters, crude oil is classified into three groups (Ⅰ, Ⅱ and Ⅲ), of which group Ⅱ oil is subdivided into group Ⅱ1 and group Ⅱ2 oil. Oil-source correlation suggests that group Ⅰ oil originates from the Es3 source rock; group Ⅱ1 oil is derived from mudstone interlayer between the gypsum rock of the Es4 interval, group Ⅱ2 oil is from mudstone of the lower part of gypsum layer of the Es4 interval; group Ⅲ oil is from mixed source rocks in both of the Es3 and Es4 intervals, mainly from Es3 source rocks, and its distribution is related to faults.Combined with the analysis of geological features of Bonan Sag, it is considered that fault and gypsum salt rocks of the upper Es4 interval are the main factors affecting the distribution of crude oil from different sources.

     

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