茫汉断陷烃源岩特征及生烃潜力分析

CHARACTERISTICS AND HYDROCARBON-GENERATING POTENTIAL OF SOURCE ROCKS IN MANGHAN FAULT DEPRESSION, THE SOUTHWESTERN SONGLIAO BASIN

茫汉断陷位于松辽盆地西南隆起区的开鲁坳陷内，断陷内有2口参数井，勘探程度很低，其中哲参2井在2010～2100m井段见到油气显示。文章分析了该断陷的沉积环境，在总结烃源岩分布、有机质丰度、有机质成熟度特征的基础上，用氯仿沥青“A”法估算出该断陷的总生烃量为10．788×10^8t，总资源量为5895．6×10^4t，九佛堂组烃源岩是该断陷的主力烃源岩，说明本区具有形成中小型油气田的物质条件。

Manghan fault depression is located in the Kailu depression in the uplifted area, the southwestern Songliao Basin. The degree of exploration is very low in the study area, with only two parameter wells drilled, of which Well Zhecan 2 encountered oil and gas shows in the interval time during 2010-2100. The sedimentary environment of the fault depression is analyzed in this paper. Based on the study of the distribution of the source rocks, the abundance and maturity of organic matter, the Chloroform Asphalt 'A' method is used to estimate the total volume of hydrocarbons generation being 10.788×10~8t and the total resources being 5895.6×10~4t. It is believed that the Jiufotang Formation is the major source rocks in the fault depression and potentials for prospecting medium to small oil and gas fields in the study area.