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Method and apparatus for predicting TOC (total organic carbon content) in shale reservoir

A shale reservoir and rock technology, applied in seismology for logging records, etc., can solve problems such as low accuracy, TOC accuracy and reliability impact, and achieve high prediction efficiency and stable and reliable prediction results

Inactive Publication Date: 2017-03-29
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In practice, due to the limitation of the signal-to-noise ratio and offset range of seismic data, the accuracy of the rock density parameters obtained through seismic inversion is low, and the TOC predicted based on the rock density parameters is usually not accurate and reliable. will be greatly affected

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  • Method and apparatus for predicting TOC (total organic carbon content) in shale reservoir
  • Method and apparatus for predicting TOC (total organic carbon content) in shale reservoir
  • Method and apparatus for predicting TOC (total organic carbon content) in shale reservoir

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Embodiment 1

[0015] figure 1 A schematic flowchart of a method for predicting TOC of a shale reservoir according to an embodiment of the present invention is shown, and the method may include the following steps S101-S105.

[0016] S101. Obtain N sample points of the first parameter set Para_Set_1, wherein the first parameter set Para_Set_1 includes total organic carbon content TOC. For example, a set of model parameters (eg, TOC, parameters related to rock properties and / or pores, etc.) may be used as the first set of parameters. For example, the first parameter set Para_Set_1 can be expressed as {TOC,...}, where "..." can represent zero, one or more other parameters in the first parameter set Para_Set_1 except TOC (for example, related to rock properties or pores parameters), and the N sample points of the first parameter set Para_Set_1 can be expressed as {TOC i ,...}, i=1...N.

[0017] S102, substitute the N sample points into the shale reservoir petrophysical model representing the...

Embodiment 2

[0052] The present application also discloses a device for predicting TOC of shale reservoirs, which may include a sampling unit, a sampling point information supplementing unit, a posterior probability determining unit, a target TOC determining unit and a TOC predicting unit.

[0053] A sampling unit, configured to obtain N sample points of the first parameter set Para_Set_1, wherein the first parameter set Para_Set_1 includes the total organic carbon content TOC;

[0054]The sample point information supplementary unit is used to substitute the N sample points into the shale reservoir petrophysical model representing the relationship between the first parameter set Para_Set_1 and the second parameter set Para_Set_2, to obtain the second parameter set corresponding to the N sample points The value of each parameter in Para_Set_2, wherein said second parameter set Para_Set_2 includes compressional wave impedance Ip, shear wave impedance Is, rock density ρ;

[0055] The posterio...

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Abstract

The present invention discloses a method and apparatus for predicting TOC (total organic carbon content) in a shale reservoir. According to the method and apparatus of the invention, a shale reservoir rock physical model is utilized to predict the TOC in the shale reservoir based on a plurality of attribute constraints such as longitudinal wave impedance Ip, transverse wave impedance Is and rock density Rho under a Bayesian framework. The prediction result of the method and apparatus is stable and reliable. The method and apparatus are suitable for processing seismic data with a low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the field of oil and gas geophysical exploration, more specifically, to a method for predicting TOC of shale reservoirs and a device for predicting TOC of shale reservoirs. Background technique [0002] The enrichment of shale gas requires a rich source material base, and requires the content of hydrocarbon-generating organic matter to reach a certain standard. Black mud shale rich in organic matter is usually the best reservoir for shale gas accumulation. The content of organic matter determines the hydrocarbon generation ability, pore space size and adsorption capacity of shale, and plays a decisive role in the gas content of shale. The higher the organic carbon content, the higher the enrichment degree of the gas reservoir. In addition, organic carbon can also affect the physical and chemical properties of shale and the development of fractures. Organic carbon will also increase the pore space of shale, which in turn deter...

Claims

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Application Information

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IPC IPC(8): G01V1/40
Inventor 胡华锋毕进娜杨丽林正良滕龙
Owner CHINA PETROLEUM & CHEM CORP
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