富县西北部地区长7页岩特征及地质意义

以富县西北部地区长7页岩为研究对象,结合岩心观察、薄片鉴定及实钻井地质资料分析等手段,从岩石矿物学、电性响应、发育规模、空间类型、有机地球化学方面,分析了长7段页岩的基本特征和地质意义。结果表明,长7页岩成分多样;区域上发育一定厚度;有机质丰度较高、有机质类型为I型和II1型、有机质热演化程度达到成熟,为邻近区域烃类聚集提供了充足的物质基础;发育的粒间孔、溶蚀孔、有机质孔为烃类赋存提供储集空间;长7页岩中存在的较细粒致密层可为油气藏提供较好的保存条件。为区域页岩油气“甜点”研究提供借鉴。

Characteristics and Geological Significance of Chang 7 Shale in Northwestern Fuxian

Taking the Chang 7 shale in Northwest Fuxian as the subject investigated,the basic geological characteristics,organic characteristics and geological significance of Chang 7 shale in Yanchang Formation were analyzed,combined with core observation,thin section identification and practically drilled geological data.The results show that the Chang 7 shale has various compositions,a certain thickness is developed in the region,abundance of organic matter is high,mature thermal evolution of organic matter of type is I and Ⅱ 1,which provides sufficient material basis for hydrocarbon accumulation in adjacent areas;Intergranular pore,dissolution pore and organic matter pore provide reservoir space for hydrocarbon occurrence,fine-grained compact layer in Chang 7 shale can be found.It provides better storage conditions for oil and gas reservoirs.It provides a reference for regional shale oil and gas “sweet spot” research.