A chlorine spectrometry logging method

A technology of energy spectrum logging and detectors, which is applied in the field of chlorine energy spectrum logging, can solve the problems of poor relative sensitivity and achieve the effects of low logging cost, simple instrument structure and improved sensitivity

Inactive Publication Date: 2005-03-16
中国石油集团测井有限公司技术中心
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Problems solved by technology

This Cl - The difference of gamma counts produced by the change of content has poor relative sensitivity for quantitative interpretation of water saturation, especially for determination of formation water saturation in high water cut period

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  • A chlorine spectrometry logging method
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Embodiment Construction

[0022] Embodiment of the invention

[0023] The invention uses thermal neutron detectors and gamma detectors to simultaneously measure thermal neutrons generated after neutrons emitted by neutron sources interact with formations and capture gamma information of elastically scattered thermal neutrons. A mathematical interpretation model for quantitatively solving formation apparent porosity and water saturation under casing conditions is obtained by calibration in a series of model wells with known porosity, salinity and lithology. Apparent porosity is determined by the weighted sum of neutron and gamma chlorine segment counts versus the porosity response. In the case of no expansion and good cementing quality, it is equal to the porosity value of the open hole. Water saturation is based on the dual effects of salinity on thermal neutrons and neutron capture gamma, that is, as the salinity increases, the number of thermal neutrons decreases and the number of neutron capture ga...

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Abstract

This invention relates to a chlorin spectrometry logging method for measuring under-well saturation moisture content during the brine layer oil injection period in oil exploration. It adopts thermal neutron detector and gamma detector to measure the thermal neutron and elastic gamma information generated in the reaction of the neutron emitting source and earth layer and it calculates the apparent porosity and water saturation in the pay through the measurement the difference between the neutron and the neutron gamma relative saturation fresh water or oil earth layer. So it overcomes the influence of the mud and frame in the earth layer and the double difference method can improve the responding accuracy in the measurement of the ground water mineralization rate.

Description

[0001] Field [0002] The invention relates to a chlorine energy spectrum logging method for measuring downhole water saturation in the high water-cut period of water injection in brine formation oil reservoirs exploited for petroleum. Background technique [0003] In the later stage of water flooding development of oilfields, water flooding makes the water cut continuously increase, which can reach more than 80%. At present, in areas with high salinity, (formation water chloride ion Cl - Content>4×10 4 ppm), two logging methods are mainly used: one is the neutron lifetime logging method; the other is the chlorine energy spectrum logging method. The former measured value is the total thermal neutron absorption cross-section in the formation. After deducting the absorption cross-section value of mud and skeleton, the difference part is used to correspond to the thermal neutron absorption cross-section of pore fluid. Determine the water saturation of the reservoir. Due to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/10G01V5/14
Inventor 何彪彭其尧
Owner 中国石油集团测井有限公司技术中心
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