Petrophysical Evaluation of Low Resistivity Sandstone Reservoirs

Hamada, G.M.; Al-Awad, Musaed N.J.

doi:10.2118/00-07-n

Cited by 6 publications

(8 citation statements)

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“…shows resistivity values in the range of 3-4 Ω.m., which are typical resistivity values for water bearing zones in central Saudi Arabia fields [4] . This well is producing hydrocarbon with little water.…”

Section: Field Examplementioning

confidence: 81%

“…NMR log can identify water free production zones, correlate bound fluid volume with clay minerals inclusions in the reservoir, and identify hydrocarbon type. [2][3][4] The connection between NMR measurements and petrophysical parameters stem from the strong effect that the rock surface has on promoting magnetic decay of saturating fluids. The longitudinal relaxation time (T1) is the parameter of high interest for estimating petrophysical properties, but the NMR only measures the transverse relaxation time (T2) which is influenced by the inclusion of paramagnetic minerals such as (iron-bearing) chlorite in the low resistivity pay zones.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Low Resistivity Beds Using Nuclear Magnetic Resonance Log

Hamada¹,

Al-Awad²

2002

eng

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Section: Field Examplementioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Evaluation of Low Resistivity Beds Using Nuclear Magnetic Resonance Log

Hamada¹,

Al-Awad²

2002

eng

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“…This negative surface charge attracts cations such as Na + and K + . When clay minerals meet with water, cations are released, resulting in increased water conductivity and a decrease in resistivity [6]. In addition, the presence of conductive minerals will result in low levels of accuracy in evaluating water saturation [7], due to having high conductivity such as iron (Fe) minerals.…”

Section: Low Resistivity Reservoirmentioning

confidence: 99%

Effect of Pump Rate Penetration Sensitivity on Hydraulic Fracturing in Low Resistivity Reservoir

Sulistyarso¹

2019

PSE

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Hydraulic fracturing is one of the stimulation methods to increase rock permeability. Hydraulic fracturing is commonly used in reservoir that have low permeability and wells which have a decline in production rate. In many cases, hydraulic fracturing show significant success which is marked by an increase in the production rates. In this paper, hydraulic fracturing will be conducted by observing the effects of pumping rates. A case example is taken from an oil well that has a low resistivity reservoir, which is HAP#532 well. This low resistivity causes the reservoir to have low permeability and small production rates. The scenario of hydraulic fracturing in HAP#532 well is done by using several different pumping rate sensitivity, start from 10 BPM, 20 BPM, and 30 BPM, as based on 15 BPM base case pumping rates to obtain the most optimal pumping rate. Therefore, it can be seen how much the effect of pumping rates on hydraulic fracturing. From three scenarios performed by using FracCADE and Prosper, author get the optimal pumping rate is 20 BPM. At this pumping rate, the fracture geometry obtained fracture half-length (Xf) is 213 ft, fracture height (hf) is 45.6 ft, fracture width (Wavg) is 0.56 inch, average permeability is 58.09 mD, and the production rate is 348 BOPD.

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“…Because the resistivity of the low resistivity oil layer is close to or less than that of the near water layer, it is difficult to identify the low resistivity oil layer with logging data. Over the years, many rock physicists have studied the causes of low resistivity oil and gas reservoirs and gradually understood the causes of low resistivity oil reservoirs [1][2][3][4]. At the same time, researchers explored the evaluation methods of low resistivity oil reservoirs from the perspectives of curve overlapping technology, crossplot technolog, semi-quantitative and quantitative evaluation technology, and proposed some evaluation methods for low resistivity oil reservoirs with different lithology and different causes, showing certain effects [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Discussion on the Method of Evaluating Oil and Water Layers by Using Ratio of Deep Resistivity and Flush Zone Resistivity

Kebing¹

2019

OGCE

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The depth-shallow resistivity ratio method for the same measuring point is an important method to identify oil and water reservoirs, But its application effect in conventional logging data is not good. By studying the invasion characteristics of resistivity curves of reservoirs, the ratio of deep resistivity and flush zone resistivity at the same measuring point is used to evaluate oil and water layers with a good effect. Further research shows that the ratio of deep resistivity to flushing zone resistivity can reflect the oil-bearing property of reservoir. The fact that the ratio of deep resistivity and flush zone resistivity of water layers in the same well is basically a constant supports this view, which can be deduced from Archie's formula. That is, the ratio of deep resistivity to flushing zone resistivity is Rw/Rmf, which is the ratio of formation water resistivity to mud filtrate resistivity. On this basis, a method of evaluating oil and water reservoir by using the ratio of deep resistivity and flush zone resistivity is proposed. One is logging crossplot evaluation method, the other is apparent water saturation calculation and evaluation method. These two methods are not affected by the changes of lithology and resistivity of the reservoir, and do not need data such as porosity, rock-electro parameters and formation water resistivity, which can quickly identify oil and water layers. As the ratio between the deep resistivity and the resistivity of the flush zone is not related to the resistivity of the reservoir, it can be used to evaluate the low resistivity oil reservoir. The results show that it is effective to identify low resistivity reservoirs and it is a reliable method to evaluate low resistivity reservoirs.

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Petrophysical Evaluation of Low Resistivity Sandstone Reservoirs

Cited by 6 publications

References 0 publications

Evaluation of Low Resistivity Beds Using Nuclear Magnetic Resonance Log

Evaluation of Low Resistivity Beds Using Nuclear Magnetic Resonance Log

Effect of Pump Rate Penetration Sensitivity on Hydraulic Fracturing in Low Resistivity Reservoir

Discussion on the Method of Evaluating Oil and Water Layers by Using Ratio of Deep Resistivity and Flush Zone Resistivity

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