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saturation evaluation of microporous low resistivity carbonate oil pays in Rub Al Khali Basin in the Middle East

Petroleum Exploration and Development 2022年第1期49卷 94-106页

作者： WANG Yongjun sUN Yuanhui YANG siyu WU shuhong LIU Hui TONG Min LYU Hengyu state Key Laboratory of Enhanced Oil Recovery Beijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China

To solve the problem that it is difficult to identify carbonate low resistivity pays(LRPs) by conventional logging methods in the Rub Al Khali Basin, the Middle East, the variation of fluid distribution and rock conductivity during displacement were analyzed by displacement resistivity experiments simulating the process of reservoir formation and production, together with the data from thin sections, mercury injection and nuclear magnetic resonance experiments. In combination with geological understandings, the genetic mechanisms of LRPs were revealed, then the saturation interpretation model was selected, the variation laws and distribution range of the model parameters were defined, and finally an updated comprehensive saturation interpretation technique for the LRPs has been proposed. In the study area, the LRPs have resistivity values of less than 1 Ω·m, similar to or even slightly lower than that of the water layers. Geological research reveals that the LRPs were developed in low-energy depositional environment and their reservoir spaces are controlled by micro-scale pore throats, with an average radius of less than 0.7 μm, so they are typical microporous LRPs. Different from LRPs of sandstone and mudstone, they have less tortuous conductive paths than conventional reservoirs, and thus lower resistivity value under the same saturation. archie’s formula is applicable to the saturation interpretation of LRPs with a cementation index value of 1.77-1.93 and a saturation index value of 1.82-2.03 that are 0.2-0.4 lower than conventional reservoirs respectively. By using interpretation parameters determined by classification statistics of petrophysical groups(PGs), oil saturations of the LRPs were calculated at bout 30%-50%,15% higher than the results by conventional methods, and basically consistent with the data of Dean stark, RsT, oil testing and production. The 15 wells of oil testing and production proved that the coincidence rate of saturation interpretation is over 90%and the feasibility of this method has b

关键词： carbonate low resistivity pays micropore type reservoir archie’s formula cementation index saturation index Cretaceous Rub Al Khali Basin

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Experimental Research on archie's Parameters at different Frequencies

Experimental Research on Archie's Parameters at different Fr...

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信号处理在地球物理——浙江省信号处理学会2018年学术...

作者： Yunsheng Zhao Gang Tian Yi Zhong school of Earth sciences Zhejiang University

As the basis of reservoir interpretation,archie’s formula can be used to calculate the oil saturation.Empirical parameters need to be provided for the purpose of applying to a certain region.archie’s parameters a,b,m,n will change according to different measurement frequency,lead to a large error in the calculation of oil saturation by different well logging methods.The parameters are calculated under the frequency of 1 kHz in laboratory,while they are used in all kinds of electric well log interpretation.Therefore,it has a great significance for the reservoir interpretation to study the parameters’ variations at different frequencies.With the frequency ranging from 12 Hz to 100 kHz,we measured the resistivity parameters of different core samples in laboratory.Through the experiment study based on sandstone reservoir,we found that parameters a.b close to 1 and have a small variation.Under the condition of fully saturated water,parameter m decreases with the increasing frequency,same as the phase’s change of complex resistivity.With the increasing frequency,parameter n increases firstly and then decreases,while phase decreases firstly and then increases.Yet their frequencies of extreme point are close in the two cases.so we conclude that the phase of complex resistivity is the most important information which closely related to lithology structure and pore fluids in the rock,thus archie’s parameters should have certain relationship with it.We ought to use appropriate parameters m and n under the corresponding frequency of the electrical logging apparatus during the data processing and interpretation.

关键词： archie’s formula complex resistivity different frequency extreme point

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