| dc.description.abstract | Chuhuangkeng anticline is the first oil-producing structure in Taiwan, there are many studies of HC in Chuhuangkeng area in the past, whereas geochemical data are comparingly less than other geophysical and geological data. In this study, we try to evaluate the petroleum system of possible reservoirs in Chuhuangkeng anticline by using geochemical analysis, combined with the results of mineral composition and XRD analysis. 30 samples including Miocene Chuhuangkeng Formation, Piling Shale, Mushan Formation and Oligocene Wuchishan Formation were studied. There are three scopes in this study: 1) to evaluate the total organic carbon(TOC) and thermal maturity of reservoirs, 2) to evaluate the porosity and permeability of reservoirs, and 3) to observe the mineral composition of reservoirs. The results of mineral composition show that there are mostly fine-grained minerals in Chuhuangkeng Formation and Piling Shale, noticeable brownish clay minerals will result in the lowering of porosity for those two formations. On the other hand, quartz content is more than 40% in Mushan Formation and Wuchishan Formation with larger grain size minerals. Furthermore, the result of XRD also shows that quartz is the major mineral in samples studied. Clay mineral contents in Mushan Formation and Wuchishan Formation are relatively less than other formations. In addition, the porosities of Mushan Formation and Wuchishan Formation are 4-6%. and negatively correlated with depth. Finally, the results of TOC and Rock-Eval pyrolysis show that TOC of most samples are less than 2%, except sample No.14 with TOC content > 4% and Tmax 492oC. The result of Ro% exhibits the same trend with Tmax. Moreover, hydrogen index(HI) indicates that sample No.14 has type III kerogen, which is gas prone. In conclusion, we expect Wuchishan Formation has the highest HC potential among samples in this study, due to its good TOC content and thermal maturity. | en_US |