Finding Bypassed or Overlooked Pay zones using Geochemistry Techniques

Maende, Albert; Jarvie, Dan

doi:10.2523/12918-ms

Cited by 3 publications

(3 citation statements)

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“…There is no clear definition of what brittleness is, and there are different methods of calculation. The two most widely used methods of calculating the brittleness index are based on mineral composition and elastic parameters [43][44][45][46][47].…”

Section: Brittleness Indexmentioning

confidence: 99%

“…The former Is based on the conten" of 'Iittle minerals in the rock and is calculated as in Equation ( 1) [46]. Brittle minerals mainly include calcite, quartz, and feldspar [46]. The latter is based on the elastic modulus and Poisson's ratio.…”

Section: Brittleness Indexmentioning

confidence: 99%

“…To reduce the errors caused by the limitations of the two methods, the rock brittleness is calculated by Equation (5). The former Is based on the conten" of 'Iittle minerals in the rock and is calculated as in Equation ( 1) [46]. Brittle minerals mainly include calcite, quartz, and feldspar [46].…”

Section: Brittleness Indexmentioning

confidence: 99%

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Evaluation of Tight Sandstone Mechanical Properties and Fracability: An Experimental Study of Reservoir Sand−Stones from Lufeng Sag, Pearl River Mouth Basin, Northern South China Sea

Peng¹,

Zhou²,

Wu³

et al. 2023

Processes

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Reservoir rocks of the Pearl River Mouth Basin’s Lufeng Sag have low porosity (average porosity 12.6%) and low permeability (average permeability 16.5 mD), requiring hydraulic fracturing to obtain economic production of oil and gas. To contribute to the understanding of these reservoirs, and to promote successful production in the region, we analyzed the mechanical properties of tight sandstone. Moreover, we introduced the shear/tensile strength factor, in combination with the fracture toughness and horizontal stress difference coefficient, as an innovative approach to characterize the ease of forming a complex fracture network after reservoir fracturing. Based on this, we established a fracability evaluation model suitable for offshore low-permeability sandstone reservoirs by an analytic hierarchy process from the perspective of whether the reservoir can form an effective transformation volume and complex fracture network after fracturing. The results indicate that the primary minerals of the target reservoir are quartz and clay minerals, and the natural fractures are not developed. The mechanical properties exhibit a high Young’s modulus (ranging from 30.4 to 34.4 GPa) and high compressive strength (with cohesion between 41 and 45 MPa and an angle of internal friction between 31.0 and 33.5°). The relatively low tensile strength and fracture toughness values are conducive to fracture initiation and extension during the fracturing process. Through the fracability evaluation model constructed in this paper, the depth interval at 4155.1–4172.1 m is identified as a high-quality fractured layer. The results of this study not only provide theoretical guidance for target well and formation selection in the Lufeng Sag, but also have important practical implications for increasing oil and gas production from tight sandstone reservoirs.

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Section: Brittleness Indexmentioning

confidence: 99%

Section: Brittleness Indexmentioning

confidence: 99%

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Evaluation of Tight Sandstone Mechanical Properties and Fracability: An Experimental Study of Reservoir Sand−Stones from Lufeng Sag, Pearl River Mouth Basin, Northern South China Sea

Peng¹,

Zhou²,

Wu³

et al. 2023

Processes

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Geological-engineering comprehensive evaluation model and application of feasibility of hydraulic fracturing in hydrate-bearing sediments

Guo,

Xue,

Chen

et al. 2024

Petroleum Science

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Optimization of Development of Heavy Oil Reservoirs through Geochemical Characterization

Canbaz

Deniz-Paker²,

Hosgor³

et al. 2019

Day 2 Mon, October 14, 2019

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Geochemistry is not only a well-known tool in providing a better understanding of the distribution of fluids in the reservoir rock but also an efficient kit in developing reservoir by decreasing the uncertainty throughout the characterization process. Utilizing geochemistry, not only efficiently identify the fluids and type of oil alteration drastically laterally and vertically over short distances in heavy oil reservoirs where such differences are of significant importance in production of heavy oils in these already challenging reservoirs, but also outline the value of geochemistry to justify the value of information in the process of more robust reservoir characterization and management of heavy oil reservoirs. A conceptual model representative heavy oil reservoir recovery is utilized to compare the recoveries between a case where geochemistry is applied to characterize the reservoir and another case where geochemical methods are not employed by using a full-physics commercial reservoir simulator. A sensitivity and optimization software is coupled with the reservoir simulator to outline the relative significance of the important parameters in the recovery process. Geochemical characterization, not only, provides information on gas content and its likely behavior where it can also lead to better decisions on completion strategies to avoid zones of different viscosity, but also the essential correlation between the geochemistry and the thermodynamics of heavy oil. Comprehensive reservoir characterization leads to a more robust identification of reservoir fluids where such knowledge will greatly enhance the efficiency thus the economics of the process that is especially important in low oil price environments. There is lack of studies recently on the application of geochemical characterization on the recovery of the process analyzing the relative significance of components, key drivers and the value of the information throughout the process, even though some authors have been published their research on geochemistry and its use in the characterization of the reservoirs. Our study outlines a comprehensive background including latest developments, investigates the key factors, and the value of information on comparative cases considering the relevant components of the process.

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Finding Bypassed or Overlooked Pay zones using Geochemistry Techniques

Cited by 3 publications

References 0 publications

Evaluation of Tight Sandstone Mechanical Properties and Fracability: An Experimental Study of Reservoir Sand−Stones from Lufeng Sag, Pearl River Mouth Basin, Northern South China Sea

Evaluation of Tight Sandstone Mechanical Properties and Fracability: An Experimental Study of Reservoir Sand−Stones from Lufeng Sag, Pearl River Mouth Basin, Northern South China Sea

Geological-engineering comprehensive evaluation model and application of feasibility of hydraulic fracturing in hydrate-bearing sediments

Optimization of Development of Heavy Oil Reservoirs through Geochemical Characterization

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