Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir

Jiang, Yanjiao; Jian, Zhou; Fu, Xiaofei; Cui, Likai; Fang, Chaoyang; Cui, Jiangman

doi:10.1155/2021/4341804

Cited by 9 publications

(3 citation statements)

References 38 publications

(29 reference statements)

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“…Electrical resistivity data can be extremely valuable for analyzing the subsoil gas behavior and its relation to surface emissions. This is valid for hydrocarbon exploration and reservoir monitoring (Jiang et al., 2021; Senger et al., 2021), for gas hydrates studies (Coren et al., 2001; Kannberg & Constable, 2020; Weitemeyer et al., 2011) but also for evaluating other types of gas emissions, as, for example, from landfills (Johansson et al., 2011). Normally, these gas assessment studies are based on well‐logs or CSEM (marine controlled‐source electromagnetic) data.…”

Section: Methodsmentioning

confidence: 99%

Methane Occurrence and Quantification in a Very Shallow Water Environment: A Multidisciplinary Approach

Ferrante

Donda

Volpi

et al. 2022

Geochem Geophys Geosyst

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Methane (CH 4 ) is a powerful greenhouse gas and, over a 20-year period, the global-warming potential of 1 tonne of atmospheric CH 4 is similar to ca. 85 tonnes of CO 2 (Hartmann et al., 2013). Global CH 4 emissions have increased nearly 10% over the past two decades (Schiermeier, 2020) and its atmospheric concentration is now more than 2.5 times above pre-industrial levels, approaching 1.9 ppm. CH 4 has a short lifetime in the atmosphere, ca. 10 years (Prather et al., 2012), and hence a stabilization/reduction of emissions will lead in a few decades to a stabilization/reduction of its atmospheric concentration and therefore its radiative forcing (Saunois et al., 2020). The most important source of uncertainty in the global CH 4 budget is attributable to natural emissions (Saunois et al., 2020), and particularly to geological seepage. Indeed, once considered a minor natural CH 4 source globally, geological degassing is today recognized as a major contributor to atmospheric CH 4 (Etiope et al., 2019). A challenging aspect on the quantification of present-day emissions is that seepage sites may be more widespread and abundant than expected, especially in the marine environment (Thornton et al., 2020). It is estimated that 30-45 Tg of CH 4 per year are released from marine seeps to the atmosphere (Etiope & Ciccioli, 2009;

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Section: Methodsmentioning

confidence: 99%

Methane Occurrence and Quantification in a Very Shallow Water Environment: A Multidisciplinary Approach

Ferrante

Donda

Volpi

et al. 2022

Geochem Geophys Geosyst

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“…It is analyzed that it is related to the Longjing Movement [43]. Early calcite cementation is most developed at the mud-sand interface [44], but it is affected by the superposition of reservoir sand bodies and channel erosion. Calcite cementation is only distributed at the mud-sand interface and has a limited range, so it has little effect on the modification of reservoir porosity.…”

Section: Accumulation Analysis Of Tight Sandstone Oil and Gasmentioning

confidence: 99%

Controlling Effect of Wave-Dominated Delta Sedimentary Facies on Unconventional Reservoirs: A Case Study of Pinghu Tectonic Belt in Xihu Sag, East China Sea Basin

Chen

Xue

et al. 2022

Geofluids

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In order to find the “sweet spots” of unconventional oil and gas from the Pinghu Formation in the Pinghu Tectonic Belt, we are committed to clarifying the development and distribution rules of coal-measure source rocks and tight reservoirs as well as the controlling factors. Using 3D seismic and logging data, combined with logging constraints of target lithology and pyrolysis experiments of source rock, "source and reservoir" research of uncoventional oil and gas was carried out in the Pinghu Tectonic Belt. The results show that two stages of regression and one stage of transgression occurred in the Pinghu Formation, resulting in river-controlled and wave-controlled delta-neritic facies dominated by sedimentary facies, source rocks developed in interdistributary bay and swamp microfacies, and tight sandstones in point bar and distributary channel microfacies are developed. The accumulation of coalbed methane and shale gas is controlled by the sedimentary facies and the degree of thermal evolution under the factors of burial depth. The accumulation of tight sandstone is closely related to the dominantly sedimentary facies and diagenetic modification of physical properties and faults. It is concluded that the structural type, type and distribution of faults, and depositional environment of the Pinghu Tectonic Belt in the Xihu Sag are the key factors controlling the development and accumulation of coal-measure source rocks and tight sandstone reservoirs. This understanding provides a clear direction for the deep exploration of unconventional oil and gas in the sag and provides a reference for finding reservoir “sweet spots.”

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“…However, the complexity of tight sandstone gas reservoirs is reflected in the fact that the enrichment areas and petrophysical characteristics of gas reservoirs are not simply correspondences [20]. A large number of high-resistivity intervals produce water, while low-resistivity pay zones produce gas [21]. These features often contradict production performance.…”

Section: Introductionmentioning

confidence: 99%

Saturation Height Modelling for Tight Sandstone Reservoirs with Gas Diffusion Dynamics Taken into Account

Lyu,

Yang,

Hao

et al. 2023

Geofluids

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Interpreting and predicting the saturation of tight sandstone gas reservoirs are the key task to improve the reservoir development. The role of gas diffusion dynamics is stronger than that of buoyancy during the gas accumulation of tight sandstone reservoirs. In this study, a saturation height model that takes gas diffusion dynamics into account is proposed, which can complement logging saturation interpretation and provide a better practice in saturation prediction. Taking the study of the Sulige tight sandstone gas reservoir in China as an example, the saturation height model compares the controlling factors and uncertainties affecting the saturation distribution, characterizes the complex gas-water distribution, and determines the lower gas charging limits. This study concludes that the configuration between gas diffusion dynamics and reservoir capillary pressure controls the distribution of saturation. The buoyancy effect only serves to improve the saturation at regional uplifts with good petrophysical properties. The different saturation characteristics in the central, western, and eastern parts of the Sulige gas field are precisely caused by the different configurations of source rock quality and reservoir quality. This study provides a key reference for static model and development deployment.

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Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir

Cited by 9 publications

References 38 publications

Methane Occurrence and Quantification in a Very Shallow Water Environment: A Multidisciplinary Approach

Methane Occurrence and Quantification in a Very Shallow Water Environment: A Multidisciplinary Approach

Controlling Effect of Wave-Dominated Delta Sedimentary Facies on Unconventional Reservoirs: A Case Study of Pinghu Tectonic Belt in Xihu Sag, East China Sea Basin

Saturation Height Modelling for Tight Sandstone Reservoirs with Gas Diffusion Dynamics Taken into Account

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