辽河坳陷东部凸起上古生界页岩气资源潜力评价

辽河坳陷的页岩气勘探尚处于起步阶段，上古生界页岩气资源潜力研究将为该坳陷东部凸起页岩气勘探提供科学依据和理论支撑。为此，基于泥页岩地球化学数据和生烃数值模拟结果，从泥页岩发育特点、有机质类型、总有机碳含量、热演化成熟度、生气能力以及含气性等方面对该区上古生界石炭系太原组、二叠系山西组泥页岩及其有机地球化学特征进行了系统分析。 结果表明：①太原组有机碳含量平均为3.31%，镜质体反射率基本大于1.5%，主要发育腐殖型干酪根，生气能力强，含气量高，是页岩气勘探的重点层系；②山西组有机碳含量平均为2.95%，处于高成熟-过成熟热演化阶段，以腐殖型干酪根为主，生气能力较强，含气量较高（稍逊于前者），同样也是页岩气勘探的重要层系。评价结论认为：辽河坳陷东部凸起上古生界具备页岩气发育的有利条件，页岩气资源潜力大，是页岩气勘探开发的有利区域。

Evaluation on Neopaleozoic shale gas resource potential in the Eastern Salient of the Liaohe Depression

Shale gas exploration in the Liaohe Depression is still at a preliminary stage,the research of Neopaleozoic shale gas resource potential there will provide important evidence and theoretical support for shale gas exploration especially in the East Salient of this depression.Based on the geochemical data and numerical simulation of hydrocarbon generation,the characteristics and geochemical features of the Neopaleozoic Taiyuan and Shanxi formations were systematically analyzed in terms of shale growth features,organic matter types,total organic carbon(TOC) content,maturity of organic matters,gas generating capacity,gas-bearing properties,etc.It was preliminarily concluded that the Neopaleozoic formations in the East Salient of this depression attains requirement of shale gas generation,accumulation and preservation.The focus of shale gas exploration in this study area is thought to be the Taiyuan formation with great capacity of gas generation and high gas content,where the TOC content is 3.13% on average;the Ro value is more than 1.5%;and the dominant kerogen is Type Ⅲ.Very similar but a little bit inferior to that,the Shanxi Formation is regarded as another important target of shale gas exploration there with the TOC content of 2.95% on average.As a whole,the Upper Paleozoic in the East Salient of the Liaohe Depression is a play fairway with favorable shale gas development conditions and high shale gas resource potential.