期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 594, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.palaeo.2022.110939
关键词
Lacustrine shale; Sedimentary facies; Elemental geochemistry; Organic petrography; Hydrocarbon exploration
资金
- National Natural Science Foundation of China [41902139]
- Innovation Team Project of Natural Science Foundation of Hubei Province [2021CFA031]
- Exploration and Development Research Institute of PetroChina Dagang Oilfield Company [DGYT-2018-JS-366, DGYT-2020-JS-37]
This study investigates organic-rich shale (ORS) in the Paleogene Qikou Sag of the Bohai Bay Basin in East China, comparing the organic matter accumulation and reservoir characteristics of two different sedimentary facies in lacustrine basins. The results provide scientific guidance for understanding the formation mechanisms of ORS in various sedimentary facies and for hydrocarbon exploration in similar areas.
Organic-rich shale (ORS) was developed in various sedimentary facies in lacustrine basins, displaying different organic matter (OM) accumulation processes, hydrocarbon potential and reservoir characterizations. Taking the Paleogene Qikou Sag (Bohai Bay Basin, East China) as an example, the ORS from two typical sedimentary facies in lacustrine basins, i.e., turbidite and deep to semi-deep lake were comparatively studied, based on the integration of mineralogical, bulk geochemical, organic petrographic, isotopic and elemental geochemical, and shale reservoir analyses. Under the influence of turbidity currents, the Es32 ORS was formed in the paleo-lake characterized by low paleoproductivity, suboxic-oxic and freshwater conditions, and high detrital influx. However, high terrigenous OM input led to moderate TOC contents (avg. 1.58 wt%) and low HI values (avg. 193 mg/g TOC) in the Es32 ORS of turbidite facies. In contrast, the Es1z ORS of deep to semi-deep lake facies was deposited in the paleo-lake with high paleoproductivity, suboxic and brackish water conditions, and low detrital influx, which resulted in high TOC contents (avg. 2.77 wt%) and HI values (avg. 335 mg/g TOC). Combined with the analysis of hydrocarbon potential and reservoir characterizations, the Es1z ORS of deep to semi-deep lake facies could serves as main source rocks for crude oil, whereas a significant shale oil potential is likely to observe in the Es32 ORS of turbidite facies in areas with favorable maturity and high brittleness. Our results are conductive to the formation mechanisms of ORS from various sedimentary facies in lacustrine basins, and provide scientific guidance for hydrocarbon exploration in similar areas.
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