临清坳陷东部太原组煤系烃源岩特征及主控因

The Characteristics of Coal Source Rock in Taiyuan Formation of Eastern Linqing Depression and Its Main Controlling Factors

通过对临清坳陷东部典型预探井太原组煤系烃源岩地球化学特征的研究,认为有机质丰度中高古7井和高古4井的有机质丰度较好,而德古2井和聊古2井则相对较差。有机质类型除高古4井和高古7井泥岩为Ⅱ1型干酪根外,其余均为Ⅲ型干酪根。有机质成熟度高古4井和德古2井达到中成熟阶段,而高古7井和聊古2井仅为低成熟阶段。煤系烃源岩的主控因素主要为沉积环境和构造演化。位于潮坪相的高古4井和高古7井形成的煤系烃源岩质量较好;而为泻湖相和台地相沉积的德古2井和聊古2井形成的烃源岩质量相对较差。构造演化中喜山期断层活动是造成临清坳陷东部不同构造带煤系烃源岩热演化差异性的主要原因。

According to the analyze on the organic geochemical of the typical wells coal source rock in the secondary structural of the eastern of Linqing Depression. It suggest that the Gaogu 4 Well and Gaogu 7 Well are high in the abundance of organic matters while Degu 2 Well and Liaogu 2 Well are in low organic abundance. The organic type of coal source rock are all Ⅲ kerogen type except the Gaogu 4 Well and Gaogu 7 Well are Ⅱ1kerogen type in mudstone. The organic maturity in Gaogu 4 Well and Degu 2 Well are in middle maturity while Gaogu 7 Well and Liaogu 2 Well are in low maturity. The characteristic of the coal source rock are impacted by the sedimentary environment,tectonic evolution. The quality of source rock in Tide-flat are better than lagoonal environment and platform environment. Tectonic evolution of Himalayan tectonic is the main reason for different thermal evolution in coal source rock in different structural of Linqing Depression.