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Method for determining paleosalinity value and methods for drawing single-well and multi-well paleosalinity plane graphs and sedimentary facies distribution diagram

A measurement method and technology of salinity value, applied in the field of geological exploration, can solve the problems of huge data volume, no consideration of boron adsorption, no consideration of the influence of chlorite calculation results, etc., and achieve the effect of easy popularization and application

Inactive Publication Date: 2020-08-04
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

Both of the above two traditional calculation methods have certain limitations. The first method regards illite as pure illite, uses potassium oxide and boron content to calculate paleo-salinity, and does not consider the adsorption of boron by other clay minerals; The limitation of the second method is that it is mainly applicable to marine facies and does not consider the influence of clay minerals such as chlorite on the calculation results
In this regard, the Dongying method takes all four clay minerals including illite, montmorillonite, kaolinite and chlorite into consideration, and improves the calculation formula of paleo-salinity of Kochi, but the formula is relatively complicated, and the required data The volume is huge, the calculation process is cumbersome, and it is impossible to carry out related work quickly and efficiently.

Method used

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  • Method for determining paleosalinity value and methods for drawing single-well and multi-well paleosalinity plane graphs and sedimentary facies distribution diagram
  • Method for determining paleosalinity value and methods for drawing single-well and multi-well paleosalinity plane graphs and sedimentary facies distribution diagram
  • Method for determining paleosalinity value and methods for drawing single-well and multi-well paleosalinity plane graphs and sedimentary facies distribution diagram

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Experimental program
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Effect test

Embodiment 1

[0032] According to the modern sedimentary geochemical data of Qinghai Lake and the East China Sea, the illite content and boron content of each single well were obtained, and the paleo-salinity value of the corresponding single well was obtained by using formula I. The obtained results are shown in Table 1.

Embodiment 2

[0045] Obtain the boron content and the percentage of illite in the clay minerals in the study area, obtain the ratio of the boron content to the illite content, use formula I to obtain the paleo-salinity values ​​of each single well in the study area, and then draw the paleo-salinity evolution of the single well Sectional drawings, such as figure 2 shown.

Embodiment 3

[0047] According to the paleo-salinity values ​​of each single well obtained in Example 2, determine the paleo-salinity values ​​corresponding to all wells in the same layer in the study area, and use the paleo-salinity values ​​in the same layer to draw the paleo-salinity plane of multiple wells in the same layer distribution chart, such as image 3 shown.

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Abstract

The invention relates to the technical field of geological prospecting, in particular to a method for determining a paleosalinity value and methods for drawing single-well and multi-well paleosalinityplane graphs and a sedimentary facies distribution diagram. The invention provides a novel method for calculating the paleosalinity value by comprehensively utilizing a boron content and an illite content. Compared with the existing paleosalinity value determination method, the provided method is more accurate, convenient and efficient, and is easy to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method for measuring paleo-salinity values, a method for drawing a single-well paleo-salinity evolution profile, a method for drawing a multi-well paleo-salinity plane map of the same horizon, and a sedimentary facies distribution map The drawing method. Background technique [0002] The study of paleo-water salinity (paleo-salinity) can help to understand the geological background of stratum deposition, restore and distinguish the sedimentary environment and sedimentary facies, explore the relationship between sea level changes and the formation of high-quality source rocks, and clarify the types of high-quality reservoirs And its distribution has important guiding significance for oil and gas exploration and development. Paleo-salinity is mainly judged by paleontological and geochemical methods, including paleontological fossil method, trace element ratio meth...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01V11/00
CPCG01N33/24G01V11/00
Inventor 张金亮孙龙
Owner BEIJING NORMAL UNIVERSITY
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