彭水地区五峰组-龙马溪组页岩气富集主控因素

Main Controlling Factors of Shale Gas Enrichment in Pengshui Area Wufeng, Longmaxi Formations

为快速确立页岩气勘探有利区,合理布设生产试验井。对PY1井五峰组-龙马溪组页岩样品进行含气性、有机地化、岩石物性、矿物组成实验分析,探讨彭水地区页岩气富集主控因素。实验研究认为彭水地区五峰组-龙马溪组页岩:层厚大、有机质丰度高、热演化程度适中,生气条件较好;有机质微孔隙多、上下盖层为致密的含泥质灰岩、灰岩且厚度大,储气能力较好;脆性矿物含量较高,深度在3 000 m以浅,利于压裂造缝,产气前景较好。彭水地区页岩有机碳、微孔含量较高与页岩含气量呈正相关,是页岩气富集的主控因素。

To quick determine for shale gas exploration favorable areas, lay out production test wells reasonably have carried out well PY1 Wufeng, Longmaxi formations shale gas-bearing property, organic geochemical, rock physical property and mineral composition experimental analyses. There out discussed main controlling factors of shale gas enrichment in the Pengshui area. The result has consid- ered that the shale in Pengshui area Wufeng, Longmaxi formations have large thickness, high organic matter abundance, moderate ther- mal evolution degree and better gas generation conditions; abundant micropores in organic matter, thick overburden and underlying dense argillaceous limestone, limestone have better gas preservation capacity; high brittle mineral contents, depth above 3 000 m, conducive to fracturing, thus have better prospect of gas production. High organic carbon, micropore contents in Pengshui area shale positively correlated to shale gas content are the main controlling factors of shale gas enrichment.