当前位置: X-MOL 学术Gas Sci. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Pore structures of shale cores in different tectonic locations in the complex tectonic region: a case study of the Niutitang Formation in northern Guizhou, Southwest China
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.jngse.2020.103398
Wenjibin Sun , Yujun Zuo , Shanyong Wang , Zhonghu Wu , Hao Liu , Lujing Zheng , Yili Lou

Abstract The Cambrian Niutitang Formation shale reservoirs are widely distributed in the complex tectonic area in northern Guizhou. Fifteen organic-rich Niutitang Formation cores were selected from the tectonic deformation zones and tectonic stability zone in northern Guizhou, including the FC1 well related to fold, TM1 well related to faults, and TX1 well in the tectonic stability zone. Pore structures and reservoir physical properties of shale were tested via microphysical experiments and low-temperature nitrogen adsorption (LTNA) test. Results indicate that the thermal evolution maturity of shale is in the over mature stage, with RO distributed between 2.30 and 3.74% and the total organic carbon content (TOC) between 3.8 and 7.5%. Shale cores in the tectonic stability zone have higher TOC content (6.25%) than that of shale (5.16%) in the tectonic deformation zones. Shale cores in the tectonic deformation zones have higher thermal evolution maturity Ro (2.98%) than that of shale (2.76%) in the tectonic stability zone. The pore size of shale cores ranges from 4.15 to 15.62 nm. The total pore volume of shale cores ranges from 9.71 to 33.20 cm3/kg, and the meso-macropore volume ranges from 7.4 to 28.21 cm3/kg. Shale cores in the tectonic deformation zones have higher average pore size, total pore volume, and meso-macropore volume percentage than that of shale cores in the tectonic stability zone. Meanwhile, the specific surface area of shale cores (SBET) ranges from 7.34 to 30.37 m2/g, and the micropore volume of shale cores ranges from 2.29 to 5.82 m3/kg. Shale cores in the tectonic stability zone have higher micropore volume, specific surface area, and percentage of micropore volume than that of shale cores in the tectonic deformation zones. Shale cores in the tectonic stability zone mainly develop micropores and mesopores. Mesopores and macropores are more susceptible to geological tectonism than micropores. The pore structures of shale in the tectonic stability zone have been effectively preserved during tectonic movements. The research results have certain guiding significance for the exploration of shale gas in the complex tectonic regions.

中文翻译:

复杂构造区不同构造部位页岩岩心孔隙结构——以黔北牛蹄塘组为例

摘要 黔北地区构造复杂的寒武系牛蹄塘组页岩储集层广泛分布。从黔北构造变形带和构造稳定带中选取了15个富含有机质的牛蹄塘组岩心,包括与褶皱有关的FC1井、与断裂有关的TM1井和构造稳定带的TX1井。通过微观物理实验和低温氮吸附(LTNA)实验测试了页岩的孔隙结构和储层物性。结果表明,页岩热演化成熟度处于过成熟阶段,RO分布在2.30~3.74%之间,总有机碳含量(TOC)在3.8~7.5%之间。构造稳定带页岩核的 TOC 含量(6.25%)高于页岩(5. 16%)在构造变形带。构造变形带页岩核的热演化成熟度Ro(2.98%)高于构造稳定带页岩(2.76%)。页岩核的孔径范围为 4.15 至 15.62 nm。页岩岩心总孔隙体积为 9.71~33.20 cm3/kg,中大孔体积为 7.4~28.21 cm3/kg。构造变形带页岩岩心的平均孔径、总孔隙体积和中大孔体积百分比均高于构造稳定带页岩岩心。同时,页岩岩心比表面积(SBET)为7.34~30.37 m2/g,页岩岩心微孔体积为2.29~5.82 m3/kg。构造稳定带页岩核具有较高的微孔体积、比表面积、和构造变形带中微孔体积比页岩岩心的百分比。构造稳定带页岩岩心主要发育微孔和中孔。中孔和大孔比微孔更容易受到地质构造作用的影响。构造稳定带页岩孔隙结构在构造运动中得到有效保存。研究成果对复杂构造区页岩气勘探具有一定的指导意义。构造稳定带页岩孔隙结构在构造运动中得到有效保存。研究成果对复杂构造区页岩气勘探具有一定的指导意义。构造稳定带页岩孔隙结构在构造运动中得到有效保存。研究成果对复杂构造区页岩气勘探具有一定的指导意义。
更新日期:2020-08-01
down
wechat
bug