东营凹陷沙河街组三段地层特征及典型成岩矿物组合研究

RESEARCH ON THE STRATIGRAPHIC FEATURES AND THE TYPICAL DIAGENETIC MINERALS OF THE MEMBER 3 OF SHAHEJIE FORMATION,DONGYING DEPRESSION

在对东营凹陷沙河街组三段地层特征、成岩矿物在不同构造带分布研究基础上,探讨了自生黄铁矿、含铁碳酸盐等典型成岩矿物的形成及其与油气的关系。针对自生黄铁矿-碳酸盐矿物-自生石英矿物组合,提出了示烃球的新认识并将其分为两大类,I型示烃球主要分布于含油性较好层段,II型示烃球主要分布于烃类活动相对较弱的非含油层段。烃类活动导致自生黄铁矿的形成,这是形成示烃球的重要原因。

The relationship between the formation of some typical mineral (the authigenic pyrite and the ferruginous carbonate) and hydrocarbon is discussed in this paper, based on the correlation of stratigraphic features and diagenetic mineral in different structural belt in the Member 3 of Shahejie Formation from Dongying Depression. Study of the characteristic mineral assemblage of authigenic pyrite, the carbonate, authigenic quartz, hydrocarbon-traced sphere is mentioned for the first time, which can be divided into two types. The relationship beween hydrocarbon-traced sphere and hydrocarbon filling is also diccussed in detail. The mineral assemblage is chiefly caused by the authigenic pyrite resulted from hydrocarbon generation. Further more, hydrocarbon-traced sphere I is found in good hydrocarbon reservoir, while hydrocarbon-traced sphere II is faund in bad reservoir.