Petroleum Science >2021,??lssue 1:??1-24 DOI: https://doi.org/10.1007/s12182-020-00495-1
Shale gas reservoir modeling and production evaluation considering complex gas transport mechanisms and dispersed distribution of kerogen
Open?Access
文章信息
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作者：Jie Zeng, Jishan Liu, Wai Li, Yee-Kwong Leong, Derek Elsworth & Jianchun Guo
作者單位：Affiliations
School of Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
Jie Zeng, Jishan Liu, Wai Li & Yee-Kwong Leong
Department of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, PA, 16802, USA
Derek Elsworth
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China
Jianchun Guo
Corresponding author
Correspondence to Jie Zeng.
投稿時(shí)間：2020-8-26
引用方式：Zeng, J., Liu, J., Li, W. et al. Shale gas reservoir modeling and production evaluation considering complex gas transport mechanisms and dispersed distribution of kerogen. Pet. Sci. (2020). https://doi.org/10.1007/s12182-020-00495-1
文章摘要
Stimulated shale reservoirs consist of kerogen, inorganic matter, secondary and hydraulic fractures. The dispersed distribution of kerogen within matrices and complex gas flow mechanisms make production evaluation challenging. Here we establish an analytical method that addresses kerogen-inorganic matter gas transfer, dispersed kerogen distribution, and complex gas flow mechanisms to facilitate evaluating gas production. The matrix element is defined as a kerogen core with an exterior inorganic sphere. Unlike most previous models, we merely use boundary conditions to describe kerogen-inorganic matter gas transfer without the instantaneous kerogen gas source term. It is closer to real inter-porosity flow conditions between kerogen and inorganic matter. Knudsen diffusion, surface diffusion, adsorption/desorption, and slip corrected flow are involved in matrix gas flow. Matrix-fracture coupling is realized by using a seven-region linear flow model. The model is verified against a published model and field data. Results reveal that inorganic matrices serve as a major gas source especially at early times. Kerogen provides limited contributions to production even under a pseudo-steady state. Kerogen properties’ influence starts from the late matrix-fracture inter-porosity flow regime, while inorganic matter properties control almost all flow regimes except the early-mid time fracture linear flow regime. The contribution of different linear flow regions is also documented.
關(guān)鍵詞
Analytical solution;Shale gas reservoir;Well performance;Kerogen and inorganic matter
