Stratum element logging element standard spectrum making and application method

An element standard spectrum and formation element technology, which is applied in the field of formation and application of formation element logging element standard spectrum, can solve the problems of inaccurate logging formation elements, and achieve the effect of short cycle and cost saving.

Inactive Publication Date: 2015-12-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for using the standard spectrum of formation elements for well logging, which solves the technical problem of inaccurate logging formation elements in the prior art

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  • Stratum element logging element standard spectrum making and application method
  • Stratum element logging element standard spectrum making and application method
  • Stratum element logging element standard spectrum making and application method

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Embodiment Construction

[0039] In the embodiment of the present invention, the formation element logging tool required by the present invention is first introduced. The formation element logging tool measures the captured gamma energy spectrum generated by neutrons in the formation, or simultaneously measures the captured gamma energy spectrum and Inelastic scattering gamma energy spectrum (collectively called secondary gamma energy spectrum), to obtain Si, Ca, Fe, S, Ti, Gd, Mg, K, Mn, Al, H, Cl, C and O in the formation rock framework Determine the lithology and framework parameters. The instrument uses an americium-beryllium neutron source or a controllable pulsed neutron source. The neutron source emits fast neutrons, and the fast neutrons undergo inelastic scattering and elastic scattering with the surrounding materials (formation, borehole and instrument itself), and the energy The neutrons gradually decrease and become neutrons that can only be in a state of thermal motion—thermal neutrons, an...

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Abstract

The invention discloses a stratum element logging element standard spectrum making and application method. First of all, an element standard spectrum is made by use of a Monte Carlo value simulation method, and then, experiment verification is carried out on the element standard spectrum by use of an instrument actual measurement power spectrum so that correctness and availability of the element standard spectrum are guaranteed. After a captured gamma power spectrum and/or an inelastic scattering gamma power spectrum of stratum elements are obtained, based on the element standard spectrum, spectrum unfolding is carried out on the captured gamma power spectrum and/or the inelastic scattering gamma power spectrum through a least square method, and the contents of the stratum elements are obtained. According to the method provided by the invention, the element yield can be rapidly and accurately obtained, and the calculation accuracy and the calculation efficiency of the element contents are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of petroleum downhole logging, and in particular relates to a method for making and applying a standard spectrum of formation element logging elements. Background technique [0002] In recent years, with the in-depth exploration and development of complex lithology (igneous rock, metamorphic rock, carbonate rock, conglomerate, etc.) oil and gas reservoirs, shale gas, tight gas and other unconventional oil and gas reservoirs, the role of formation element logging has been improved. More and more attention has been paid to it, and its application is becoming more and more extensive. For example, in the exploration of shale gas and tight gas, formation element logging has become a must-test item. This is because understanding lithology and framework parameters is the basis of logging interpretation, especially for unconventional oil and gas reservoirs. Formation element logging can directly and accurately dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40G01T1/36
Inventor 岳爱忠何绪新王树声余卫东何子忠林岩栋石丽云
Owner BC P INC CHINA NAT PETROLEUM CORP
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