鄂尔多斯盆地延长组烃源岩有机显微组分特征

从有机岩石学角度出发,综合应用干酪根和全岩光片观察方法,在《透射光—荧光干酪根显微组分鉴定及类型划分方法》部颁行业标准的基础上,结合富氢组分随热演化程度光性变化明显的特点,将鄂尔多斯盆地三叠系延长组优质烃源岩显微组分划分为腐泥组、壳质组、镜质组、惰质组4种类型,其中,腐泥组作为最主要的组分表明湖生藻类是其主导生源类型。另外,烃源岩中腐泥型微粒状镜质体的普遍存在,一方面证实了当时沉积水体为还原环境,微生物降解强烈;另一方面也说明了优质烃源岩已进入大量生烃期,为本区有机质热演化阶段划分提供了佐证。

The Organic Maceral Characteristic of Yanchang Source Rock in Ordos Basin

From the viewpoint of organie petrology,comtbining kerogen method with bulk rock,this paper classified the organic macernls of Yanchang formation high-quality source rock in Ordas Iasin into 4 groups as follows saproplinuite,exinite,vitrinite and inertinite,The elassifieation is based on petroleum industry standard and takes accout of the chracteristic that the optical variance of the hydrogen-rich mocerals is obvious during the thermal evolotion at the same time,As the most primary maceral of Yanchang formation,the sapropelimte indicates that take alga is predominat parent material.In uddition ,it is confirmed that the existence of saprapcl particulate vitrinte means deoxidized depositional enviornment and intense micro-degradation,as well as that high-quality source rock has entered remarkable hydrocarbon-generating stage,which offers evidence for clasification of thermal evolution stage of organic matter.