Method for Determining Oil Source Using Sulfur Isotopes in Sulfur-Containing Compounds in Crude Oil

A sulfur isotope and compound technology, applied in the field of oil and gas exploration, can solve problems such as the difficulty of accurately determining the parent source, and achieve the effect of solving the difficulty of oil source comparison

Active Publication Date: 2017-11-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Crude oil is rich in sulfur-containing compounds, some of which come from source rocks, and some come from organic-inorganic interactions in reservoirs. Therefore, the sulfur isotope of crude oil is a mixed value, and it is difficult to accurately determine the parent source.

Method used

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Examples

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Effect test

Embodiment 1

[0041] The present embodiment provides a method for determining an oil source by utilizing sulfur isotopes in crude oil monomer sulfur-containing compounds, wherein the specific steps of the method are as follows:

[0042] Step 1: Add 500 mg of crude oil with a total sulfur content of 2.06 wt% (from Well ZS1C in Tarim Basin, density 0.791 g / ml at 20°C) and 5 ml of dichloromethane into a 25 ml eggplant bottle, followed by 0.45 g of silver tetrafluoroborate was added, 0.45 ml of methyl iodide was added with a syringe under vigorous stirring, and the reaction was stirred for 12 hours in the dark and at room temperature, and the above steps were repeated once. After the reaction, the silver iodide precipitate generated in the reaction solution was filtered and removed, and the dichloromethane in the filtrate was removed by a rotary distillation apparatus;

[0043] Step 2: add 20 ml of n-hexane to the remaining oil, shake vigorously and then cool to 0°C, there is precipitation, aft...

Embodiment 2

[0052] The present embodiment provides a method for determining an oil source by utilizing sulfur isotopes in crude oil monomer sulfur-containing compounds, wherein the specific steps of the method are as follows:

[0053] Step 1: Add 200 mg of crude oil with a total sulfur content of 4.86wt% (from Luojia area of ​​Shengli Oilfield, density of 0.981 g / ml at 20°C) and 2 ml of dichloromethane into a 10 ml eggplant-shaped bottle, Subsequently, 0.43 g of silver tetrafluoroborate was added, 0.43 ml of methyl iodide was added with a syringe under vigorous stirring, and the reaction was stirred for 12 hours in the dark and at room temperature, and the above steps were repeated once. After the reaction, the silver iodide precipitate generated in the reaction solution was filtered and removed, and the dichloromethane in the filtrate was removed by a rotary distillation apparatus;

[0054] Step 2: add 8 ml of n-heptane to the remaining oil, shake vigorously and then cool to 0°C, there i...

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PUM

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Abstract

The invention provides a method for determining oil sources by using sulfur isotopes in monomer sulfur-containing compounds of crude oil. The method comprises the following steps: crude oil is dissolved in ethanol, dichloromethane or dichloroethane, an alkylating reagent is added, and filtrate is obtained after a reaction; ethanol, dichloromethane or dichloroethane are removed from the filtrate, and oily substances are obtained; the oily substances and an alkane solvent of C5-C7 are mixed, and separation is carried out for deposition; the deposition is dissolved in dichloromethane, trichloromethane or acetonitrile, a first dealkylating reagent is added, and a solution A is obtained; extraction is carried out, and a thiophene compound and a solution B are obtained; a second dealkylating reagent is added into the solution B for carrying out a second dealkylation reaction, and a solution C is obtained; extraction is carried out, and a thioether compound is obtained; sulfur isotopic distribution of monomers in the thiophene compound and the thioether compound as well as sulfur isotopic distribution of sulfate in an oil-generating rock stratum system are determined; two sulfur isotopic distributions are compared, and the stratum whose isotopic distribution is most close to is the oil source layer.

Description

technical field [0001] The invention relates to a method for determining an oil source by utilizing sulfur isotopes in a sulfur-containing compound of crude oil, and belongs to the technical field of oil and gas exploration. Background technique [0002] Oil-source correlation is a key link in oil and gas exploration, which is related to the selection of favorable exploration zones and the evaluation of resource potential. Oil-source correlation is difficult due to the loss of biomarker compounds or the similarity of biomarker compounds in multiple sets of strata. For example, whether marine oil and gas in the Tarim Basin come from Cambrian source rocks or Ordovician source rocks? Or mixed sources, etc., there has always been controversy; another example, whether the condensate oil in the Leikoupo Formation in the Zhongba Gas Field in the Sichuan Basin is a marine strata or is generated by the Triassic continental source rocks, etc. There are more or less problems in oil-so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/28G01N30/72G01V9/00
CPCG01N30/72G01N33/2823G01V9/00
Inventor 朱光有王萌史权
Owner PETROCHINA CO LTD
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