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A method for determining total organic carbon in fine-grained sedimentary rocks

A technology of total organic carbon and sedimentary rock, applied in the field of petroleum exploration, can solve the problem of low accuracy of organic carbon content, and achieve the effects of avoiding the influence of pyrite, simple calculation and convenient operation.

Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for determining the total organic carbon in fine-grained sedimentary rocks, which solves the technical problem that the accuracy of determining the organic carbon content in fine-grained sedimentary rocks is not high in the prior art scheme

Method used

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  • A method for determining total organic carbon in fine-grained sedimentary rocks
  • A method for determining total organic carbon in fine-grained sedimentary rocks
  • A method for determining total organic carbon in fine-grained sedimentary rocks

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Experimental program
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Effect test

Embodiment approach 1

[0056] Embodiment 1: The coordinate values ​​of the AC logging curve and the CNL logging curve increase in the opposite direction, and the ΔAC-DEN of the key well is established according to the AC logging parameter value and the DEN logging parameter value. Specifically, ΔAC-DEN represents the AC logging parameter value. The distance between the well curve and the DEN logging curve is specifically calculated according to the following formula:

[0057]

[0058] Among them, Δt is the acoustic time difference, ρ b is the bulk density, Δt 1 and Δt 2 is the scale range of AC logging parameter values, Δt 1 2 , ρ 1 and ρ 2 is the scale range of DEN logging parameter values, ρ 1 2 .

Embodiment approach 2

[0059] Embodiment 2: The coordinate values ​​of the AC logging curve and the CNL logging curve increase in the opposite direction, and the ΔAC-CNL of the key well is established according to the AC logging parameter value and the CNL logging parameter value. Specifically, ΔAC-CNL represents the AC logging parameter value. The distance between the well curve and the CNL logging curve is specifically calculated according to the following formula:

[0060]

[0061] Among them, Δt is the acoustic time difference, φ N is the neutron porosity, Δt 1 and Δt 2 is the scale range of AC logging parameter values, Δt 1 2 , φ N1 and φ N2 is the scale range of CNL logging parameter values, φ N1 N2 .

Embodiment approach 3

[0062] Embodiment 3: The coordinate values ​​of the CNL logging curve and the DEN logging curve increase in the same direction, and the ΔCNL-DEN of the key well is established according to the DEN logging parameter value and the CNL logging parameter value. Specifically, ΔAC-CNL represents AC The distance between the logging curve and the CNL logging curve, specifically, according to the following formula:

[0063]

[0064] Among them, φ N is the neutron porosity, ρ b is the bulk density, φ N1 and φ N2 is the scale range of CNL logging parameter values, φ N1 N2 , ρ 1 and ρ 2 is the scale range of DEN logging parameter values, ρ 1 2 .

[0065] S104. Establish a quantitative relationship function between ΔX-Y and total organic carbon.

[0066] Specifically, corresponding to the three implementation modes in S103, S104 specifically has the following three implementation modes:

[0067] Establish the quantitative relationship function TOC=f(ΔAC-DEN) between ΔAC-DEN and...

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Abstract

The invention discloses a method for determining total organic carbon in fine-grained sedimentary rocks, comprising: obtaining the total organic carbon of core samples of key wells; obtaining the first type logging parameter values ​​of the core samples and the second type logging parameters of the core samples Parameter values, wherein, the first type logging parameter value and the second type logging parameter value belong to the three-porosity logging information; the ΔX of the key well is established according to the first type logging parameter value and the second type logging parameter value -Y, wherein, X represents the first type of well logging curve, Y represents the second type of well logging curve, and the ΔX-Y represents the distance between the first type of well logging curve and the second type of well logging curve; Quantitative relationship function between Y and total organic carbon; calculate the total organic carbon of the well without coring according to the quantitative relationship function. Therefore, the technical problem of low accuracy of the determination of organic carbon content in fine-grained sedimentary rocks by the existing technical scheme is solved, and the accuracy of TOC determination can be improved compared with the existing ΔlgR method.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method for determining total organic carbon in fine-grained sedimentary rocks. Background technique [0002] With the continuous improvement of conventional oil and gas exploration and development, the deepening of geological understanding, and the continuous advancement of technology, unconventional oil and gas exploration is becoming more and more prosperous. potential. However, tight oil and shale gas generally have the characteristics of low resource abundance, poor reservoir quality, stronger heterogeneity and concealment. Therefore, evaluation of source rock quality, reservoir quality, and engineering quality is carried out to determine the 1. The "sweet spot" of shale gas is of great significance to the exploration and development of unconventional oil and gas. Among them, TOC (Total Organic Carbon, total organic carbon) is one of the important indicators ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 周立宏蒲秀刚韩文中廖前进肖敦清陈善勇林常梅杨飞柳飒
Owner PETROCHINA CO LTD