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Method for correcting porosity of volcanic rock suffered from clay alteration

A correction method and technology of volcanic rocks, applied in earthwork drilling, wellbore/well components, etc., can solve the problem of high porosity calculation of volcanic rocks, and achieve high-precision results

Active Publication Date: 2018-03-23
PETROCHINA CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for calibrating the porosity of clay-altered volcanic rocks in view of the problems existing in the prior art. The method utilizes core petrophysical experiment data and conventional logging data to establish clay-altered volcanic rock porosity calculations model to address the high porosity calculations of clay-altered volcanic rocks

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  • Method for correcting porosity of volcanic rock suffered from clay alteration
  • Method for correcting porosity of volcanic rock suffered from clay alteration
  • Method for correcting porosity of volcanic rock suffered from clay alteration

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[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0038] see figure 1 A method for calibrating the porosity of clay-altered volcanic rocks provided by the invention comprises the following steps:

[0039] Step 101: Perform thin-section identification and scanning electron microscope analysis on the selected volcanic rock core samples to determine whether there is alteration and the type of alteration, and perform porosity measurement and whole-rock mineral analysis on the clay-altered volcanic rock to determine its clay content;

[0040] Step 102: Analyzing the response characteristics of clay-altered volcanic rocks on conventional logging curves, and selecting sensitive logging curves reflecting clay alteration;

[0041] Step 103: using the sensitive logging curve to construct a curve that can comprehensively reflect the alteration degree of volcanic clay;

[0042] Step 104: using the clay...

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Abstract

The invention discloses a method for correcting the porosity of a volcanic rock suffered from clay alteration. The method comprises the following steps: selecting a representative volcanic rock core,determining whether there are alterations and alteration types, and measuring the conventional porosity and clay content of the rock core suffered from clay alteration; analyzing the response characteristics of the volcanic rocks suffered from clay alteration on conventional logging curves, and selecting four conventional logging curves which are sensitive to clay alteration; considering the weight of influence of each curve and determining formula combination forms so as to construct a curve which can comprehensively reflect clay alteration degree of the volcanic rock through a sensitive logging curve; constructing a target stratum clay content calculation model through the clay content and the calculated alteration degree curve obtained from the whole rock mineral analysis; and finally correcting the porosity of the volcanic rock suffered from clay alteration by the physical model of the study area in combination with clay content curves. The method achieves continuous correction ofthe porosity of the volcanic rock suffered from clay alteration and improves the calculation accuracy of the porosity of the volcanic rock suffered from clay alteration.

Description

technical field [0001] The invention belongs to the technical field of well logging evaluation of complex oil and gas reservoir formations in petroleum exploration, and in particular relates to a method for calibrating the porosity of volcanic rocks by clay alteration. Background technique [0002] In oil and gas exploration, an important parameter in logging interpretation is the quantitative calculation of porosity. The calculation of formation porosity mostly adopts three-porosity curve, which is the basis of porosity calculation and plays an important role in logging evaluation. It has been widely used both in conventional clastic rocks and in complex lithology reservoirs. [0003] With the continuous deepening of oil and gas exploration, complex formations such as volcanic rocks have gradually become the focus of exploration. Compared with clastic rock reservoirs, volcanic rock reservoirs generally have a larger burial depth, various rock types, and strong heterogeneit...

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 朱明姚卫江胡婷婷高衍武陈国军赵延静李静贾春明李国利潘拓高明肖华杨帆张进程亮张啸邵广辉
Owner PETROCHINA CO LTD
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