Abstract The deep shale gas reservoirs of the Wufeng-Longmaxi Formations in southern Sichuan Basin have strong heterogeneity and complex geological characteristics, resulting a poor fracturing effect low vertical production. Based on whole-rock X-ray diffraction analysis, scanning electron microscopy, gas-bearing experiments, rock mechanical parameter tests well logging elemental data, sediment...

At present, the understanding of sedimentary paleoenvironment and organic matter enrichment law black shale in Wufeng-Longmaxi Formation is still insufficient. This time, we investigated total carbon (TOC) content, X-ray diffraction mineralogical composition, major trace element abundances newly recovered cores three gas exploration wells Changning, Qianjiang, Xiushan areas which were, respecti...

Electrical exploration has become an important means of shale gas reservoir and evaluation, is expected to play a key role in the later stages fracturing development. At present, research on electrical response characteristics reservoirs their relationship with parameters extensive in-depth, but there little complex resistivity anisotropy influencing factors, which restricts petrophysical model...

The relationship between the Late Ordovician–Early Silurian sedimentary system, weathering, paleoclimate, and primary productivity in Yangzi region is not well understood. In this study, by analyzing sedimentation cycle major trace elements of Youc 2 southeast Sichuan Basin, coupling relationships weathering indicators, terrigenous debris input redox condition U-Mo covariance model, Mo/TOC rela...

In this study, shale cores from 20 wells in the S1l11-1 sublayer of Longmaxi Formation buried shallow (<3500 m) and deep (>3500 southern Sichuan Basin, China were collected to compare their pore structures gas-bearing properties using multiple experiments. Results showed that layer has relatively lower brittle mineral content, which is disadvantageous terms higher requirements it imposes ...

The major ice caps in the late Ordovician lay between base of N. extraordinarius biozone and lower part persculptus biozone, consistent with low values CIA, CIW PIA for Huadi No. 1 well, reflecting a short-lived cold dry climate from top Wufeng-Guanyinqiao Formation to Longmaxi well. These observations provide geochemical record evidence Gondwana glaciation at end South China.