Reservoir evaluation of the Lower Silurian Longmaxi Formation shale gas in the southern Sichuan Basin of China
Reservoir evaluation of the Lower Silurian Longmaxi Formation shale gas in the southern Sichuan Basin of China
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DOI：
10.1016/j.marpetgeo.2014.07.008
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发表时间：
2014-11
影响因子：
4.2
通讯作者：
Shangbin Chen;Yanming Zhu;Yong Qin;Hongyan Wang;Honglin Liu;Junhua Fang
中科院分区：
文献类型：
--
作者：
Shangbin Chen;Yanming Zhu;Yong Qin;Hongyan Wang;Honglin Liu;Junhua Fang
下志留统龙马溪组（古生代）是中国四川盆地南部（扬子板块）富含有机质（黑色）页岩。本研究分析了龙马溪组黑色页岩的横向范围和厚度、埋藏深度、总有机碳含量和热成熟度作为页岩气储层的关键特征。黑色页岩的厚度范围为 10 至 170 m。最厚的油藏位于长宁—纳西—永川地区。地层底部（50 米厚）页岩的 TOC 在 2.0% 以上。 TOC的横向分布随厚度的横向分布而变化，其中巩县-泸州-永川地区TOC最大。埋深2000米至4500米。页岩热力过成熟。储层特征评价表明，川南地区龙马溪组具备页岩气成藏条件，具有资源潜力。储层特征初步评价的目的是寻找有利勘探的潜力区。这里最有利的区域定义为黑色页岩厚度大于100米且埋深小于3000米的区域；这些区域覆盖约 12,600 平方公里。最有利的地区位于泸州地区东北部，面积约5100平方公里。
The Lower Silurian Longmaxi Formation (the Palaeozoic) is organic-rich (black) shale in the southern Sichuan Basin (the Yangtze Plate) of China. This study analyses the lateral extent and thickness, burial depth, total organic carbon content and thermal maturity of the Longmaxi Formation black shale as the key features of the shale gas reservoir. The thickness of the black shale ranges from 10 to 170 m. The thickest reservoir is located in Changning-Naxi-Yongchuan region. The TOC of the shale at the bottom of the formation (50-m thickness) is above 2.0%. The lateral distribution of TOC varies with the lateral distribution of thickness, with the maximum TOC in the Gongxian-Luzhou-Yongchuan region. The burial depth ranges from 2000 to 4500 m. The shale is thermally over mature. The evaluation of reservoir characteristics indicates that the Longmaxi Formation has conditions appropriate for shale gas accumulation and thus resource potential in the southern Sichuan Basin of China.The objective of this preliminary evaluation of the reservoir characteristics is to locate potential areas favourable for exploration. The most favourable areas are defined here as those where the thickness of black shale is more than 100 m and the burial depth is less than 3000 m; these cover approximately 12,600 km2. The most favourable areas, which cover an area of approximately 5100 km2, are located in the northeast Luzhou region.