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首页> 外文期刊>Petroleum exploration and development >Influencing factors of micropores in the graptolite shale of Ordovician Pingliang Formation in Ordos Basin, NW China
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Influencing factors of micropores in the graptolite shale of Ordovician Pingliang Formation in Ordos Basin, NW China

机译：西北鄂尔多斯盆地奥陶系平凉组砾岩质页岩中的微孔影响因素

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Multiple tests were conducted on graptolite shale samples from Middle Ordovician Pingliang Formation in three typical areas in Ordos Basin to investigate the relationship between micro-nano pore structure, graptolite content, rock composition, TOC, maturity, main and trace elements and gas content. The graptolite of Pingliang Formation concentrates in the black shale at the lower section of this layer. Pores in the shale are diverse in types, including pores made by extracellular polymeric substance (EPS), in bio-graptolite body, as inter-granular void of clay minerals, intra-granular, interstitial space between mineral crystals, micro-fractures, and intra-granular dissolution structures etc. Tests show that graptolite affected the sedimentary environment and shale gas accumulation; graptolites content is positively correlated to TOC, in a certain range, specific surface area is positively correlated to TOC and maturity, etc., as overall a lithologic inorganic and organic ratios. The rare earth elements (REE) patterns of the three areas are similar, indicating the same provenance. REE, Fe, Al and Ti content are negatively correlated to TOC, indicating the high REE content is not caused by organic matter enrichment, but related to the absorption of minerals particles. Gas content is positively correlated to specific surface area, TOC and maturity. The above factors contribute to space and size distribution of micro-nano pores in shale.
机译：在鄂尔多斯盆地三个典型地区的中奥陶统平凉组的滑石质页岩样品上进行了多次测试，以研究微纳孔隙结构，滑石含量，岩石成分，TOC，成熟度，主要和微量元素与含气量之间的关系。平凉组的笔脚石集中在该层下部的黑色页岩中。页岩中的孔隙类型多种多样，包括由生物角砾岩体内的胞外聚合物质（EPS）制成的孔隙，粘土矿物的粒间空隙，矿物晶体之间的粒内间隙，微裂缝和试验表明，斜辉石会影响沉积环境和页岩气的聚集。总体上，岩性无机和有机物的比例，石墨石含量与TOC呈正相关，在一定范围内，比表面积与TOC和成熟度等呈正相关。这三个区域的稀土元素（REE）模式相似，表明来源相同。 REE，Fe，Al和Ti的含量与TOC呈负相关，表明REE的高含量不是由于有机质富集引起的，而是与矿物颗粒的吸收有关。气体含量与比表面积，TOC和成熟度呈正相关。上述因素有助于页岩中微纳米孔的空间和尺寸分布。

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