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Shale gas rock physics and logging method

A petrophysical and shale gas technology, applied in earthwork drilling and production, wellbore/well components, etc., can solve problems such as low reliability of logging methods, unreliable logging methods, and physical models that cannot truly reflect, etc., to achieve Effects of improving reliability and improving accuracy

Inactive Publication Date: 2016-08-10
CHENGDU CHUANGYUAN OIL & GAS TECH DEV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing physical models cannot truly reflect the complex minerals in the shale gas reservoir and the porous types caused by the complex minerals, and the reliability of the logging method for the shale gas reservoir is low. The purpose of the present invention is to Provide a shale gas petrophysical and logging method, through the establishment of a physical model, it can more realistically reflect the complex minerals of shale gas reservoirs and the porous types caused by complex minerals, that is, the kerogen dispersed in a certain form The physical characteristics of the rock, so that the accuracy of the predicted velocity can be improved in the process of using the rock model to predict the velocity of the shale gas reservoir. On this basis, the stress can be calculated and measured according to the conventional logging curve without the logging shear wave velocity. The maximum and minimum horizontal principal stresses and fracture pressures in the underground with consistent values ​​solve the unreliable problem of in-situ stress logging methods in shale gas reservoirs

Method used

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  • Shale gas rock physics and logging method

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Embodiment

[0025]A shale gas petrophysical and logging evaluation method, establishing a physical model of shale gas reservoirs, predicting the logging compressional and shear wave velocities on the basis of conventional logging curves; on this basis, calculating the maximum and minimum levels of the reservoir Principal stress, fracture pressure; established petrophysical model, including minerals, kerogen, pores and fluids contained therein, the fluids in the pores include oil, gas, water, where kerogen is equivalent to a coin-shaped fracture Morphology of particles, use the particle aspect ratio to represent its size and shape, calculate the rock elastic parameters containing kerogen by differential calculation, and obtain the elastic characteristics of kerogen dispersed in the rock.

specific Embodiment approach

[0027] First, the mineral volume, porosity, saturation, and kerogen volume in the formation are obtained through logging interpretation; the elastic modulus and density of the main minerals are obtained through intersection analysis, and the elastic modulus and purpose of the fluid are obtained through literature research. The parameters specifically refer to the bulk modulus and shear modulus; the logging interpretation results are introduced into the newly established shale gas reservoir petrophysical model, and the compressional wave velocity and shear wave velocity are iteratively calculated by adjusting the pore type distribution spectrum parameters in the petrophysical model. Calculate the dynamic Young's modulus and Poisson's ratio by using the predicted compressional and shear wave velocities, and convert the dynamic Young's modulus and Poisson's ratio into Young's modulus and Poisson's ratio according to the empirical relationship summarized by the measured data in the ...

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Abstract

The invention discloses a shale gas rock physics and logging method comprising the following steps: building a shale gas reservoir rock physics model considering Kerogen particles, and predicting logging vertical and transverse wave speed; calculating reservoir maximum and minimum horizontal principal stress and fracture pressure; carrying out accurate stress evaluation for the shale gas reservoir even under no transverse wave logging. The shale gas rock physics and logging evaluate method can build the rock physics model so as to truly reflect shale gas reservoir complex minerals and multi-pore types caused by the complex minerals, i.e., the method can reflect the rock physics characteristics of the Kerogen existing in certain form in a scatter manner; the rock physics model can carry out reservoir speed prediction, thus improving prediction speed precision, i.e., improving shale gas reservoir logging method reliability.

Description

technical field [0001] The invention relates to the field of well logging of shale gas reservoir rocks, in particular to a shale gas petrophysical and well logging method. Background technique [0002] Shale gas is natural gas stored in mudstone, shale or fine-grained sedimentary rocks with heavy silt. In the field of conventional oil and gas exploration and development, people regard mudstone and shale as cap rocks and interlayers, and usually ignore them when evaluating the petrophysical properties of formations, resulting in a shortage of logging evaluation methods and related research on shale gas formations. Unconventional shale gas resources have been increasingly valued by various countries. [0003] Well logging, as an efficient geophysical detection technology, plays an important role in different stages of shale gas exploration and development. First of all, it is an efficient and economical method to discover and evaluate shale gas reservoirs by using well loggi...

Claims

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Application Information

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IPC IPC(8): E21B49/08
CPCE21B49/087
Inventor 金涛刘欢
Owner CHENGDU CHUANGYUAN OIL & GAS TECH DEV
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