... should result in thinner sand laminae. Excellent outcrops of the Wenchang Formation are present in a roadcut in Tonglu County. These Ordovician rocks were deposited along the southeastern side of the Zhe-Wang Marginal Sea Basin, a part of the lower Paleozoic Yangtze Sea ( Fig. 1 ). The Wenchang...

... accumulation process and locate the active gas source rocks in the Baiyun depression. The fluid inclusion gases were generated from oil-prone Wenchang Formation source rocks of high thermal maturity (1.7%–3.1% vitrinite reflectance [ R o ]), with most R o values between 2.1% and 2.7% R o . The mixing...

... are associated with condensate and are characterized by relatively heavy carbon isotopes, with methane and ethane δ 13 C values ranging from –44.2‰ to –33.6‰ and –30.0‰ to –25.4‰, respectively. Nearly all methane and ethane are derived from oil-prone type II kerogen in the Wenchang Formation source rock, whereas...

..., is characterized by two thick, Paleogene, organic-rich synrift units, the Wenchang and Enping Formations. The integration of bulk geochemical and biomarker data with tectonic and sedimentary information provides the basis for a comprehensive assessment of the environmental and ecological changes through geologic...

...Figure 7 —Organic matter maturity of the Wenchang Formation in the Wenchang B sag, Zhu III subbasin. ...

...Figure 6. Typical lithofacies and sedimentary structures of the Wenchang Formation in the HZ25 Block of the HZ Depression. (a) 3785.8 m in HA1, fine-grained conglomerate with cross bedding. (b) 3753.8 m in HA2, conglomerate with cross bedding. (c) 3767.5 m in HA2, fine-grained conglomerate...

..., South China Sea, utilizing four different kinds of methods, i.e., saturated hydrocarbon biomarkers, strontium abundance, non-pollen microalgae assemblies, and carbon-sulfur relationships. Results show that the second member of the Eocene Wenchang Formation (E 2 w 2 ) was deposited in a freshwater...