镇—泾地区三叠系延长组烃源岩沉积有机相分析及评价

根据鄂尔多斯盆地南部镇原—泾川地区延长组烃源岩的有机岩石学、沉积学及有机地球化学特征将其划分为三种沉积有机相类型:三角洲有机相、滨浅湖有机相以及半深湖—较深湖有机相。其中,半深湖—较深湖有机相有机质丰度高、有机质类型以Ⅱ_1—Ⅱ_2为主,生烃性能最好;滨浅湖有机相中腐植组分含量较高,有机质丰度相差较大,生烃性能差—中等;三角洲有机相有机质丰度低,显微组分以腐植型为主,为非—差的烃源岩。

Analysis and Appraisal of Sedimentary Organic Facies of Source Rock of the Yanchang Formation in Zhen-Jing Area

According to the characteristics of organic petrology, sedimentology and organic geochemistry, the source rocks of the Yanchang Formation in Zhenyuan - Jingchuan area in the south of Erdos basin are divided into three sedimentary organic facies including delta, coastal - shallow lake and semi - deep lake. The semi - seep and deep lake organic facies has high abundance of organic matters which are mainly of Ⅱ1 - Ⅱ2 type , thus posses the best hydrocarbon generating properties. The coastal - shallow lake organic facies has high content of humic substances and largely variant abundance of organic matters, thus has poor to medium hydrocarbon generating capability. The delta organic facies has low abundance of organic matters with humic substances as the main microscopic component, thus belongs to very poor to poor source rocks.