Method for evaluating fluid properties of oil and gas reservoirs according to gas logging component PID-series indexes
A technology of fluid properties and oil and gas reservoirs, applied in the field of oil and gas exploration and development data processing, can solve the problems that other parameters cannot intersect and learn from each other, and achieve the effect of increasing the discovery rate, improving the accuracy of interpretation and evaluation, and wide application range
Inactive Publication Date: 2019-04-05
CNPC GREATWALL DRILLING ENG
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Problems solved by technology
[0023] The technical problem to be solved by the present invention is: the present invention overcomes the defect that the traditional Pixler map method can only analyze the properties of the reservoir fluid according to the graphic features, and cannot intersect with other parameters to complement each other, and provides a new gas logger based on gas logging data. The component ratio characteristic parameter infers the reservoir fluid property interpretation method, made a major reform to the original Pixler diagram method, calculated a new evaluation index, established a new interpretation diagram and the application form of the curve interpretation diagram
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[0062] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0063] Gas logging detects C1-C5 light hydrocarbon components in oil and gas reservoirs. The gas logging data includes C1 (methane), C2 (ethane), C3 (propane), iC4 (isobutane), nC4 ( n-butane), iC5 (isopentane) and nC5 (n-pentane), Pixler Ratio (Pixler Ratio) P1, P2, P3, P4 are: Wherein C4=iC4+nC4, C5=iC5+nC5.
[0064] The invention expands the use method of the Pixler (Pixler) chart, calculates a new evaluation index, and defines a PID series index (Pixler Index Difference) that characterizes the fluid properties of oil and gas reservoirs. Such as figure 2 As shown, the PID series index (Pixler Index Difference) is calculated by the following formula:
[0065] PIDs 1 =P ...
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The invention relates to the technical field of processing of oil and gas exploration and development data, and particularly discloses a method for evaluating the fluid properties of oil and gas reservoirs according to gas logging component PID-series indexes. Gas logging data include C1, C2, C3, iC4, nC4, iC5 and nC5, and the Pixler ratios P1, P2, P3 and P4 are shown as below, wherein C4=iC4+nC4and C5=iC5+nC5; the PID-series indexes PID1, PID2 and PID3 are calculated for oil and gas reservoir evaluation, wherein PID1=P2-P1, PID2=P3-P2 and PID3=P4-P3. The method has the advantages that the quantified PID-series indexes are suitable for digitally explaining the requirements of the reservoir properties; the calculation method is simple but has a wide application range; the indexes can be combined with other logging parameters, and the interpretation and evaluation accuracy of the reservoir fluid properties is improved; the indexes can be even combined with logging parameters to be flexibly used, and a basic method is provided for accurately evaluating the oil and gas reservoirs and increasing the discovery rate of the oil and gas reservoirs in an exploration area.
Description
technical field [0001] The invention relates to the technical field of oil and gas exploration and development data processing, in particular to a method for evaluating properties of oil and gas reservoirs based on gas component ratios using gas logging data. Background technique [0002] The oil and gas detection method in mud logging technology belongs to the expanded application of reservoir geochemical analysis technology in the drilling construction site. It is the most timely and direct means to evaluate and evaluate oil and gas reservoirs. It has developed into a modern comprehensive logging system that combines geological logging, gas logging, drilling fluid logging, rock pyrolysis and geochemical logging, and drilling monitoring while drilling. These detection and analysis methods are all mature oil and gas show detection and evaluation technologies. [0003] Gas logging detection of C1-C5 light hydrocarbon components in oil and gas reservoirs belongs to the hydroc...
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Login to View More IPC IPC(8): E21B49/08G06F17/50G06Q10/06G06Q50/02
CPCE21B49/087G06F30/20G06Q10/06393G06Q50/02
Inventor 伍东余明发和志明陈波仵燕赵东
Owner CNPC GREATWALL DRILLING ENG