Relationship between source rock development and petroleum accumulation in the Erlian Basin, northern China

Abstract

The Wuli and Saihan sags in the Erlian Basin, the most petroliferous basin in northern China, were analysed with bulk geochemical analysis, carbon isotopic composition, microthermometry of fluid inclusions, and basin modelling to characterize the organic matter abundance and composition, to construct source rock development models, and to reveal the relationship between source rock development and hydrocarbon accumulation. The samples display wide variations in total organic carbon content and Rock‐Eval indices, suggesting heterogeneity of organic matter richness and type. The Wuli Sag has oxic depositional environment, high productivity, and high total organic carbon content; the effective oil source rocks are mainly distributed in the deep sag where the productivity is high; and there is plenty of organic matter left and preserved after degradation. In the Saihan Sag, there is a small amount of organic matter deposited because of low productivity; the effective oil source rocks are mainly distributed in the slope by the deep sag where the reducing degree is the strongest. The source rock development models controlled the geochemical characteristics and distribution of source rocks, which are the keys to hydrocarbon potential and accumulation. The oil of Wuli Sag is mainly distributed in the deep sag, whereas the oil of Saihan Sag is mainly distributed in the slope by deep sag, which is in agreement with the previously effective oil source rocks distribution. In the strong division sags, the region where source rock distributed is beneficial to hydrocarbon accumulation. The conclusions may have important implications for petroleum exploration in other small lacustrine depositional systems.

Main controlling factors of organic matter enrichment of the Mesoproterozoic source rocks from the North China Craton

“…The large variety among the TOC values from the Mesoproterozoic source rocks in the NCC indicates differences in the evolution of the organic matter enrichment. Two models are available to account for these differences, one of which is the productivity model (Ding et al, 2018; Schoepfer et al, 2015; Tyson & Pearson, 1991; Van Bentum, Reichart, Forster, & SinningheDamsté, 2012; Zonneveld et al, 2010). In the productivity model, the main controlling factor of organic matter enrichment is marine productivity.…”

Paleoenvironment and Organic Characterization of the Lower Cretaceous Lacustrine Source Rocks in the Erlian Basin: The Influence of Hydrothermal and Volcanic Activity on the Source Rock Quality

“…Reconstruction of the paleoenvironment and genesis of high-quality source rocks are vital for assessing the hydrocarbon generation potential of source rocks in various sub-sags in the basin. Previous studies on source rocks mainly focused on a single sag, with the analysis of inorganic and bulk organic geochemical characteristics, − the oil-source correlations, ,− and the origin of lacustrine dolomites. − Ding et al ,,, believed that source rocks in Member 1 of the Tengger Formation (Fm) in the Erlian Basin were deposited in oxic to anoxic and fresh to brackish water conditions, with abundant terrestrial organic matter input and little aquatic organic matter input. The sources and depositional environments of the source rocks were mainly determined by differences in tectonic settings .…”