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Method for recognizing coal measure strata lithology

A coal-measure stratum and characteristic technology, applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problems of data discontinuity, difficulty, and high cost

Inactive Publication Date: 2016-06-22
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is costly, the data is not continuous, it takes a long time, the efficiency is low, and it is difficult to implement it in practice.

Method used

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  • Method for recognizing coal measure strata lithology
  • Method for recognizing coal measure strata lithology
  • Method for recognizing coal measure strata lithology

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Embodiment 1

[0037] This embodiment provides a method for identifying the lithology of coal-measure formations. Specifically, it provides a method for identifying and evaluating logging characteristic parameters based on the petrophysical facies of coal-measure formations, using the continuous data of logging data and carrying The feature of rich geological information can identify the petrophysical facies such as coal rock, shale and limestone in unconventional coal measure strata.

[0038] The following combination figure 1 The method provided in this embodiment is described in detail.

[0039] First, in step S101, the coal-measure formation is divided into a plurality of petrophysical facies based on the petrophysical characteristics of the coal-measure formation. According to the unique genetic mechanism characteristics of marine (Taiyuan Formation) and continental (Shanxi Formation) coal measure strata geology and geophysics, the corresponding petrophysical facies are divided, including co...

Embodiment 2

[0068] In this embodiment, the method of the present invention is described in detail through the lithology identification process of the coal measure strata in the Heshun and Yanchuan South Demonstration Area. The following combination image 3 The flow of steps in the method of this embodiment is described in detail.

[0069] In step S301, the coal measures strata are divided according to the logging data.

[0070] In step S302, the logging curve is preprocessed. Specifically, it may include log depth correction, core homing, and data standardization.

[0071] In step S303, the coal-measure stratum is automatically stratified by using the logging curve, and the well profile is divided according to the logging curve. Preferably, according to the difference of coal strata, the symmetrical difference slope method is adopted to realize automatic stratification of the formation. The symmetrical difference slope method is a method for stratification using the shape characteristics of t...

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Abstract

The invention discloses a method for recognizing the coal measure strata lithology. The method includes the following steps: dividing a coal measure strata into a plurality of rock physical facies based on rock physical characteristics of the coal measure strata; extracting logging characteristic parameters of the coal measure strata according to a logging curve of a key well, and determining a principal component parametric model meeting the rock physical characteristics of the coal measure strata; comparing the plurality of rock physical facies and known geologic facies of the key well, and establishing a corresponding relationship between the rock physical facies and the geologic facies; and layering a logging response curve of a target well, calculating a principal component numerical value of each layer of the coal measure strata based on the principal component parametric model, determining the rock physical facies corresponding to the coal measure strata layer-by-layer, and recognizing the strata lithology according to the corresponding relationship between the rock physical facies and the geologic facies. Through non-linear comprehensive assessment, the method can rapidly and accurately recognize the rock physical facies of the coal measure strata.

Description

Technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for identifying the lithology of coal-measure formations. Background technique [0002] Compared with traditional oil and gas reservoirs, unconventional coal-measure formations such as coal, shale, and limestone have unique geological and geophysical characteristics. The identification technology for these unconventional coal-measure formations faces many problems and challenges: First, due to the complex lithology and strong heterogeneity of the coal-measure formations, the logging response presents obvious nonlinear characteristics. Conventional oil and gas reservoir treatment methods, The interpretation model is not applicable or can not be directly applied in the logging identification and evaluation of coalbed methane reservoirs; secondly, as the adsorbed gas, coalbed methane is no longer a kind of gas with independent space that affects t...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 张松扬陈钢花王晓畅龚劲松李军
Owner CHINA PETROLEUM & CHEM CORP
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