Abstract
Through the regional geological survey, outcrop section measurement and other field geological work, a block of black shale is found at the outcrop of Mengjiawopu Section of Hongshuizhuang Formation in Jixian County, and organic geochemical source rock analysis and evaluation methods are used to study the source rocks in Hongshuizhuang Formation. The set of source rocks is mainly gray-black silty mudstone and gray-black shale, with a cumulative thickness of 78 m; the total organic matter (TOC) is generally high, with an average content of 1.35%, of which good and rich source rock samples account for 86%. A combined analysis of the stable carbon isotope of kerogen, the correlation between Pr/nC17 and Ph/nC18, and the ratio of saturated hydrocarbon to aromatic hydrocarbon identifies that the organic matter is mainly Type Ⅱ kerogen; the equivalent vitrinite reflectance Ro of organic matter is from 1.68% to 1.94%. Rc, the correlation of the methylphenanthrene index (MPI) against the vitrinite reflectance is from 1.63% to 1.81%, with an average of 1.71%, and the Odd/Even Predominance (OEP) value is between 0.87 and 1.11, both indicating that the source rocks of the Hongshuizhuang Formation are at the stage of high to over maturation. In summary, the set of source rocks in Hongshuizhuang Formation is characterized by high organic matter content, good kerogen types, and high to over maturation stage.
Highlights
Lingyuan-Ningcheng Basin includes the western Lingyuan City, the majority of Ningcheng County, and the eastern Pingquan County
Previous studies suggest that the potential source rocks of the Meso-Neoproterozoic strata in the northern North China include Gaoyuzhuang Formation at the top of the Changcheng System, Hongshuizhuang Formation in the middle and lower part of Jixian System, Tieling Formation, and Xiamaling Formation at the bottom of the Qingbaikou System [1] [2] [3] [4]
Oil-rich source is found in the Meso-Neoproterozoic strata of Well Niu D1 drilled in the basin [5] [6], which discloses to a certain extent the hydrocarbon generation and accumulation of the Meso-Neoproterozoic strata in the basin; it is significant to the exploration studies of the Meso-Neoproterozoic strata in the basin for discoveries of oil and gas
Summary
Lingyuan-Ningcheng Basin includes the western Lingyuan City, the majority of Ningcheng County, and the eastern Pingquan County. Previous studies suggest that the potential source rocks of the Meso-Neoproterozoic strata in the northern North China include Gaoyuzhuang Formation at the top of the Changcheng System (the main lithology in the basin consists of gray-black shale interbedded with fine sandstone), Hongshuizhuang Formation in the middle and lower part of Jixian System, Tieling Formation (the main lithology includes gray-black shale, gray-black silt-stone, and gray-black shale interbedded with a thin layer of siltstone), and Xiamaling Formation at the bottom of the Qingbaikou System (the main lithology includes quartz sandstone, gray-black mudstone, ripple-bedded gray-yellow sand shale, and interbedded marlstone) [1] [2] [3] [4]. A total of seven dark mudstone/shale samples are collected from Hongshuizhuang Formation on the section and analyzed by the School of Resources and Environment, Yangtze University (Key Laboratory of Exploration Technologies for Oil and Gas Resources and, Ministry of Education) (Figure 2)
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