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Logging identification method for low-salinity-cause low-resistivity oil reservoir

An identification method and salinity technology, which is applied in earthwork drilling, wellbore/well components, measurement, etc., can solve problems such as difficulty in interpretation, and achieve the effect of improving the coincidence rate of oil layer interpretation and clarifying the technical level

Pending Publication Date: 2022-02-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is: (1) overcome the problem that existing mud logging and well logging technology are difficult to interpret in low-salinity formation oil layers, and propose a new mud logging identification method for low-salinity origin and low-resistivity oil layers; (2) Improve the coincidence rate of interpretation of low-salinity oil layers; (3) Realize rapid and effective identification of low-salinity oil layers during drilling

Method used

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  • Logging identification method for low-salinity-cause low-resistivity oil reservoir
  • Logging identification method for low-salinity-cause low-resistivity oil reservoir
  • Logging identification method for low-salinity-cause low-resistivity oil reservoir

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Embodiment 1

[0091] The present invention has been widely used in the exploration and development of oilfields. In the process of identifying the fluid properties of low-salinity and low-resistivity reservoirs in well X in the Niger exploration area of ​​West Africa, refer to image 3 , the resistivity of the 1091.5-1099.5m reservoir in the lower part of the well increased significantly, but the oil and gas fluorescence display and gas logging anomalies were worse than those of the upper two sets of reservoirs. It is 920ppm, which belongs to the typical low-salinity reservoir. The resistivity of the 1071.5-1076.5m reservoir in this well is lower than that of the lower 1091.5-1099.5m reservoir, but the oil and gas fluorescence display and gas logging abnormal characteristics are obvious. Using the method of the present invention, the specific analysis and interpretation process is as follows (such as figure 1 shown):

[0092] The first step is to obtain the conventional fluorescence loggi...

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Abstract

The invention provides a logging identification method for a low-salinity-cause low-resistivity oil reservoir. The method comprises the following steps of obtaining fluorescent logging data information and performing quantitative processing on the information to obtain quantitative assignment of fluorescent logging parameters; calculating a reservoir section oil and gas display index F by using the obtained quantitative assignment; gas logging data being obtained, and the total hydrocarbon anomaly coefficient Kg of the reservoir section being calculated; drilling-time logging data being obtained, and a drilling-time abnormal coefficient Kd of the corresponding reservoir section being calculated; calculating an oil and gas anomaly index Z of a front reservoir section; obtaining oil-tested reservoir section data and establishing a Z-F intersection chart; based on the established Z-F intersection chart, determining a reservoir fluid property interpretation standard; and identifying a low-salinity-cause low-resistivity oil layer, and explaining fluid properties of a target layer. According to the method, quantitative processing of conventional fluorescence qualitative data is realized through a standard geological experience assignment method; and quantitative application of conventional fluorescence logging data is realized through calculation of the oil and gas display index F.

Description

technical field [0001] The present invention relates to the field of oil and gas development. Specifically, the present invention relates to the technical field of mud logging identification in the development process of low-resistivity reservoirs. More specifically, the present invention relates to the field of mud logging identification of low-salinity origin and low-resistivity oil layers. method. Background technique [0002] Low-salinity oil layers are generally developed in the middle and shallow parts of the formation. Such oil layers are adjacent to fresh water layers, and the conductivity of formation water is lower than that of high-salinity water layers, resulting in relatively high resistance characteristics of water layers. At the same time, the sandstone in the oil layer has poor diagenesis and heavy shale content, among which clay minerals are mostly distributed in a dispersed state, and the cation exchange phenomenon is obvious under the action of an electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00
CPCE21B49/00E21B47/00
Inventor 翟光华刘邦李早红邹荃何伶张新新
Owner BC P INC CHINA NAT PETROLEUM CORP
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