陆相页岩源储特征及其发育模式—以鄂尔多斯盆地东南部延长组长7段为例

以鄂尔多斯盆地东南部延长组长7段为研究目标，对陆相页岩有机地化特征，物性特征，微观结构等方面对储层源储特征关系以及发育模式进行研究。结果表明：有机碳含量分布在0.13%～13.3%,分布范围较大，主要位于2%～7%,平均值为4.8%;有机质类型主要是Ⅰ型和Ⅱ₁型为主，以生气为主。镜质体反射率(Ro)分布在0.827%～1.042%,主体分布范围是0.8%～1.0%,平均值为0.92%,烃源岩已经完全进入成熟阶段；孔隙度介于0.75%～14.97%,均值为3.77%。研究区泥页岩主要发育粒间孔、晶间孔及有机孔等，为页岩气提供储集空间与运移通道，页岩气排烃动力主要为源储压差，一般为5～12 MPa,运移类型主要为初次及二次运移。按照岩性组合以及有机地化参数可分为两大类型，分别是厚层暗色泥岩夹薄层泥质细砂岩和厚层泥岩与纹层互层。

Source - reservoir characteristics and development model of continental shale- A case study of Chang 7 member of Yanchang Formation in southeastern Ordos Basin

In this paper, the Chang 7 member of Yanchang Formation in the southeastern Ordos Basin is taken as the research target, and the relationship between reservoir source and reservoir characteristics and development model are studied from the aspects of organic geochemical characteristics, physical properties and microstructure of continental shale. The results show that the organic carbon content is distributed between 0.13 % and 13.3 %, and the distribution range is large, mainly between 2 % and 7 %, with an average of 4.8 %. The types of organic matter are mainly type I and type II1, mainly gas. Ro is distributed in 0.827% ~ 1.042%, the subject distribution range is 0.8 ~ 1.0 %, the average value is 0.92 %, the source rock has fully entered the mature stage ; the porosity is between 0.75 % and 14.97 %, with an average of 3.77 %. In contrast, black shale and silty shale have poor physical properties, and fine sandstone has better physical properties.