Rock wettability identification method and device based on rock electricity experiment data
A technology of experimental data and wettability, applied in the field of petroleum logging interpretation, can solve problems such as the influence of rock conductivity, difficulty in identifying production and non-producing layers, and oil saturation calculation errors, and achieve the effect of improving calculation accuracy.
Pending Publication Date: 2021-05-28
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
However, more and more studies have proved that simple linear fitting can only extract limited information from rock electrical experiment data, and with the increasingly complex characteristics of oil and gas reservoirs, the wettability of rocks, the shale content of rocks The influence of factors such as rock conductivity on rock conductivity is becoming more and more important. The different wettability characteristics of rocks may affect the conductivity of rocks, and lead to calculation errors in oil saturation of rock samples, and even directly lead to production layers and non-productive layers. Difficulty in identifying production layers
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[0032] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.
[0033] The invention provides a rock wettability identification method based on rock electric experiment data, and forms a saturation calculation formula considering rock wettability. Through the in-depth analysis of the rock electrical experiment data, the wettability information of the rock is extracted. and a saturation calculation equation that takes rock wettability into account. The calculation accuracy of rock sample saturation is improved without increasing the cost of experimental analysis. In well logging reservoir evaluation, it is expected to improve the accuracy of logging calculation of oil saturation. The complete content of the method includes two parts: rock electric experiment test and data processing and analysis.
[0034] The content of the rock electrical experiment te...
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According to a rock wettability identification method and device based on the rock electricity experiment data, rock wettability characteristics are extracted through the conductive characteristics contained in the rock electricity data, the saturation calculation equation considering the rock wettability is formed, and the calculation precision of the oil saturation is improved. The practical method for judging the rock wettability is formed according to the rock electricity experiment data. According to the method, according to the fact that wettability can generate corresponding characteristics on rock conductivity, characteristic extraction is carried out through data processing, information of rock wettability is obtained, and a saturation calculation equation considering rock wettability is formed through the step 2. The straight line is in a special form of a curve, namely an approximation; and in addition, in terms of a physical mechanism, the classical Archie formula does not consider the influence of the wettability on the conductivity of the rock, the method considers the influence of the wettability of the rock on the conductivity, the oil saturation is calculated according to the saturation equation, and the calculation precision of the oil saturation of the reservoir can be hopefully improved.
Description
technical field [0001] The invention relates to the field of petroleum logging interpretation, in particular to a rock wettability identification method and device based on rock electrical experiment data. Background technique [0002] The interaction force between rock solid molecules and fluid molecules in pores has different forms and ranges of action, resulting in different contact modes between rock solids and fluids. This different contact mode is the wettability of rocks. Therefore, the wettability of rock is a physical characteristic of rock itself, which is related to the interaction force between solid particle molecules and fluid molecules in rock, and wettability will affect the conductive path of rock , forming different conductive features. There are three types of wettability of rocks: water wet, mixed wet and oil wet. [0003] The rock electrical experiment of rock samples is the basic data of conventional core analysis, which can be used to determine the r...
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Login to View More IPC IPC(8): G01V3/38
CPCG01V3/38Y02A90/30
Inventor 姜黎明刘堂晏章海宁张海涛罗燕颖孟贺
Owner BC P INC CHINA NAT PETROLEUM CORP