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Oil source comparison method via magnesium isotope

A magnesium isotope, oil source technology, applied in the field of oil and gas exploration

Active Publication Date: 2019-11-05
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in some complex areas, such as the Tarim Basin, whether the oil and gas come from the Cambrian or the Ordovician has always been controversial

Method used

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  • Oil source comparison method via magnesium isotope

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Embodiment Construction

[0065] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0066] The embodiment of the present invention takes the oil reservoir in the Bohai Bay Basin as an example for specific description, and the specific method includes the following steps:

[0067] S111. Take about 20g of fresh crude oil sample from the oil outlet wellhead of the production well site; weigh 6-8g of fresh crude oil into a quartz beaker, add 15mL of petroleum ether, shake well to make the crude oil and petroleum ether basically miscible, add anhydrous 15 mL of ethanol, shake well and heat on a hot plate at 80°C for 12 hours.

[0068] S112. Weigh again 6-8 g of fresh crude oil into a quartz beaker, and repe...

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Abstract

The invention discloses an oil source comparison method via magnesium isotope. The method comprises the following steps that S100) magnesium elements in crude oil are separated and enriched; S200) magnesium elements in a hydrocarbon source rock are separated and enriched; S300) the content of the magnesium elements is tested and analyzed; S400) stable isotopic content of magnesium is detected andanalyzed; S500) a delta26Mg(per thousand)-oil reservoir type identifying index plate is established by magnesium isotope analysis on the hydrocarbon source rocks of the know different deposition environments and different maturity as well as the crude oil and hydrocarbon source rock of different properties; and S600) source and genesis of an unknown oil source are determined via the established identifying index plate. Thus, when magnesium isotope is used to identify the source and genesis of oil gas, the genesis of the oil gas can be determined rapidly, and technical and theoretical guidanceis provided for determination of an oil gas exploration target.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and in particular relates to a method for carrying out oil source correlation by using magnesium isotope. Background technique [0002] Organic geochemistry research mainly focuses on the composition, structure, origin and evolution of organic matter in geological bodies. In the field of oil and gas exploration, especially the genesis of oil and gas and the correlation of oil sources are very important, which are related to the evaluation of exploration targets, the selection of well locations, and the scale of oil and gas reservoirs. and distribution laws, etc., therefore, are highly valued. The conventional method is to use biological markers, carbon isotopes and other indicators to determine the origin and source of oil and gas, which have been successfully used in most areas or oil and gas fields. However, in some complex areas, such as the Tarim Basin, whether the oil and ga...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N1/28G01N1/34G01N27/626
CPCG01N27/62G01N1/286G01N1/34G01N1/28G01N2001/2866
Inventor 朱光有周磊
Owner PETROCHINA CO LTD
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