Unconventional shale-gas systems: The Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment
Unconventional shale-gas systems: The Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment
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DOI：
10.1306/12190606068
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发表时间：
2007-04-01
期刊：
影响因子：
3.5
通讯作者：
Pollastro, Richard M.
中科院分区：
文献类型：
--
作者：
Jarvie, Daniel M.;Hill, Ronald J.;Pollastro, Richard M.
页岩气资源区带可根据天然气类型和系统特征进行划分。位于德克萨斯州沃斯堡盆地的纽瓦克东部气田是由低孔隙度和低渗透率巴内特页岩的热成因气生产确定的。巴内特页岩气系统是一个自成体系的生储体系，它在主要产气区具有良好的原始有机质丰度和生气潜力，干酪根和残留油分别发生一次和二次裂解，油通过吸附作用滞留裂解成气，油通过吸附作用滞留成气。（4）有机质分解产生的孔隙度;以及（5）脆性矿物组成。根据估计的最终采收率计算的总天然气储量（GIP）约为204 bcf/剖面（5.78 x 10（9）M-3/1.73 x 10（4）m（3））。我们估计，巴内特页岩的总发电潜力约为609桶油当量/ac-ft或相当于3657 mcf/ac-ft（84.0 m（3）/m（3））。假设厚度为350英尺（107米），只有足够的氢部分裂解保留的石油天然气，总发电潜力为820 bcf/部分的估计。其中，约60%被排出，其余的被保留下来，如果达到足够的热成熟度，则用于石油到天然气的二次裂化。巴内特页岩在典型储层压力、体积和温度条件下的气体储存能力以及6%孔隙度显示出540 mcf/ac-ft或159 scf/ton的最大储存能力。
Shale-gas resource plays can be distinguished by gas type and system characteristics. The Newark East gas field, located in the Fort Worth Basin, Texas, is defined by thermogenic gas production from low-porosity and low-permeability Barnett Shale. The Barnett Shale gas system, a self-contained source-reservoir system, has generated large amounts of gas in the key productive areas because of various characteristics and processes, including (1) excellent original organic richness and generation potential; (2) primary and secondary cracking of kerogen and retained oil, respectively; (3) retention of oil for cracking to gas by adsorption; (4) porosity resulting from organic matter decomposition; and (5) brittle mineralogical composition.The calculated total gas in place (GIP) based on estimated ultimate recovery that is based on production profiles and operator estimates is about 204 bcf/section (5.78 x 10(9) M-3/1.73 x 10(4) m(3)). We estimate that the Barnett Shale has a total generation potential of about 609 bbl of oil equivalent/ac-ft or the equivalent of 3657 mcf/ac-ft (84.0 m(3)/m(3)). Assuming a thickness of 3 50 ft (107 m) and only sufficient hydrogen for partial cracking of retained oil to gas, a total generation potential of 820 bcf/section is estimated. Of this potential, approximately 60% was expelled, and the balance was retained for secondary cracking of oil to gas, if sufficient thermal maturity was reached. Gas storage capacity of the Barnett Shale at typical reservoir pressure, volume, and temperature conditions and 6% porosity shows a maximum storage capacity of 540 mcf/ac-ft or 159 scf/ton.