Tight Gas Sands

Holditch, Stephen A.

doi:10.2118/103356-jpt

Cited by 382 publications

(90 citation statements)

References 12 publications

(15 reference statements)

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“…Tight sandstone reservoirs show strong heterogeneities and have the geological characteristics of low porosity and low permeability [2,35], thus making it important to find a high-resolution time-frequency analysis method for the identification of hydrocarbon reservoirs. In this section, we attempt to apply the EWT-SET method to the field data, which is typical of tight sandstone reservoirs from the Zhongjiang gas field located in Western Sichuan, China.…”

Section: Hydrocarbon Detection Using Ewt-setmentioning

confidence: 99%

“…However, global unconventional oil and gas resources are almost four times conventional oil and gas resources and the exploration of unconventional oil and gas is still stay in the developing stage [1]. Besides, unconventional reservoirs have complex geological structure and usually show poor petrophysical properties, such as strong heterogeneities, low porosity and permeability, which makes seismic signals more complex [2][3][4][5]. Therefore, it is necessary to find reliable methods, which can use seismic data directly for hydrocarbon detections in unconventional reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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An Improved Time-Frequency Analysis Method for Hydrocarbon Detection Based on EWT and SET

et al. 2017

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Oil and gas reservoirs can cause increased attenuation of seismic waves, which can be revealed by time-frequency analysis for direct detection of hydrocarbons. In this paper, a new method applying the empirical wavelet transform (EWT) in association with the synchroextracting transform (SET), named EWT-SET, is proposed as an improved time-frequency analysis method for hydrocarbon detection. The SET is a novel time-frequency analysis method which can be considered as a post-processing procedure of short-time Fourier transform and can improve the energy concentration of the time-frequency representation by retaining only the time-frequency information most related to the signal time-varying features. Given the potential limitations of SET for broadband nonstationary seismic signals, using the EWT-SET method which applies SET to the signal after EWT decomposition, not only effectively extracts time-varying features of seismic signals but also improves the performance of SET in concentrating instantaneous energy. The preliminary model tests demonstrate that EWT-SET can effectively depict the location and extent of attenuation anomalies related to hydrocarbons with changing thicknesses of the gas-bearing layer. Application to field data further confirms the capacity for hydrocarbon detection of the presented method. Thus, the EWT-SET method shows significant application prospects and promotion value for hydrocarbon detection.

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Section: Hydrocarbon Detection Using Ewt-setmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Improved Time-Frequency Analysis Method for Hydrocarbon Detection Based on EWT and SET

et al. 2017

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“…In 1970s, the U.S. government decided that the definition of TGR is one in which the expected value of permeability to gas flow would be less than 0.1 md [3]. Holditch [3] reported that the best definition of TGR is "a reservoir that cannot be produced at economic flow rates nor recover economic volumes of natural gas unless the well is stimulated by a large hydraulic fracture treatment or produced by use of a horizontal wellbore or multilateral wellbores".…”

Section: Introductionmentioning

confidence: 99%

“…Holditch [3] reported that the best definition of TGR is "a reservoir that cannot be produced at economic flow rates nor recover economic volumes of natural gas unless the well is stimulated by a large hydraulic fracture treatment or produced by use of a horizontal wellbore or multilateral wellbores". Some experts thought that the permeability should be between 0.1md and 0.0001md [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Optimal Designs of Well Pattern for the Development of Tight Gas Reservoirs (TGRs)

Jiao¹,

Xia²,

Jianye³

et al. 2016

TOEFJ

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Abstract:Both horizontal well and fractured-horizontal well have been widely used to develop TGRs. However, the costs of horizontal well and fractured-horizontal well are much higher than the vertical well. Therefore, it is necessary to consider the reservoir conditions for evaluating the potential benefit when choosing well pattern or designing well parameters. In this paper, a simulator of simulating the development of TGRs including slippage flow and stress dependence in matrix, and high-velocity nonDarcy flow and stress effect in hydraulic fractures was firstly developed. Then, it was used to study the development effects of different TGRs using different well patterns and well parameters. Based on the simulation results, the incremental ratio models of horizontal well to vertical well and fractured-horizontal well to horizontal well were achieved. These models can be used to predict the incremental production using horizontal well or fractured-horizontal well. We also obtained the plates of choosing well pattern and designing the corresponding parameters to achieve a good profit in the field.

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Hydraulic Fracturing

Valkó

2014

Kirk-Othmer Encyclopedia of Chemical Technology

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Hydraulic fracturing is a well completion/stimulation technique that became the focus of attention because of its significance in the exploitation of unconventional oil and gas reserves. This article starts with a brief history of the operation, followed by a discussion of its unique role in productivity enhancement. Following the overview of materials, equipment, and procedures involved, a review of the diagnostics and other evaluation methods, as well as an outline of the current modeling efforts, will be discussed. One section provides a glimpse into the newest trends in completion hardware, highlighting multistage fracture treatment systems developed for long horizontal wells. In the last section, the commercial and environmental impacts of the technology are considered. The article concludes that hydraulic fracturing has substantially widened the spectrum of choices communities face in arbitrating among potential energy supply options, and hence, it will continue flourishing in the long term.

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Tight Gas Sands

Cited by 382 publications

References 12 publications

An Improved Time-Frequency Analysis Method for Hydrocarbon Detection Based on EWT and SET

An Improved Time-Frequency Analysis Method for Hydrocarbon Detection Based on EWT and SET

Optimal Designs of Well Pattern for the Development of Tight Gas Reservoirs (TGRs)

Hydraulic Fracturing

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