Comparison of the controls on heavy oil and tar sand formation in the Western Canadian Sedimentary Basin and Liaohe Basin, NE China
Heavy oil and tar sand bitumen dominate the Worlds petroleum inventory. They are formed via biodegradation of conventional oil, which makes the oil more difficult to produce and more costly to refine. The biodegraded oils from the Western Canadian Sedimentary Basin (WCSB) and Liaohe Basin, NE China were characterized in terms of their bulk compositions, individual compound concentrations and biomarker hydrocarbon ratios. The WCSB is an extensive marine foreland basin, characterized by shallow dips, and thin, relatively homogeneous reservoir sands, which have experienced a long history of petroleum charging with long oil in- reservoir residence time and with a complex post- charging uplift and erosion history. In contrast, the Liaohe Basin is a narrow lacustrine rift basin, characterized by thick oil columns charged rapidly into thick, heterogeneous faulted reservoirs, in a dynamic extensional tectonic depression. The patterns attributed to biodegradation, however, are similar in both cases despite the different geological histories. Variations in biodegradation and associated fluid properties along regionalscale east- west trends in the WCSB and between different fault blocks in the Lioahe Basin were controlled by the reservoir temperature and oil charge histories in each basin. Small-scale vertical oil compositional gradients within individual oil columns, which have significant impact on fluid properties, are developed due to interaction of biodegradation at the oil-water contact and simultaneous petroleum charging. The availability of essential nutrients to support microbial metabolism are most likely sourced from mineral dissolution within the water leg, This is thought to have a significant impact upon the rate of biodegradation. The similarities in biodegradation patterns within these two types of basin allow for accurate prediction of the degree of biodegradation and viscosity variations likely to be encountered within the reservoirs. Based on these findings, the changes in oil composition through an oil column resulting from biodegradation can be readily linked to physical properties, such that we can locate sweet-spots and optimize the placement of new well. Variations in oil composition along well bores also allow produced oil composition to be used to allocate oil production to specific well intervals from long production wells.
HAIPING HUANG BARRY BENNETT JENNIFER ADAMS STEVE R LARTER
Petroleum Reservoir Group (PRG), Department of Geology and Geophysics, University of Calgary, 844 Ca Petroleum Reservoir Grou (PRG), Department of Geology and Geophysics, University of Calgary, 844 Cam Petroleum Reservoir Group (PRG), Department of Geology and Geophysics, University of Calgary, 844 Ca Petroleum Reservoir Group (PRG), Department of Geology and Geophysics, University of Calgary, 844 Ca
国际会议
首届世界重油大会(The Technical Sessions of the First World Heavy Oil Conference)
北京
英文
791-800
2006-11-12（万方平台首次上网日期，不代表论文的发表时间）