The Triassic Halahatang Formation in the Tahe Oilfield, Tarim Basin, records a complex transition from fluvial to lacustrine depositional systems, yet its depositional architecture, evolutionary process, and controlling mechanisms remain insufficiently constrained. In this study, core observations, thin-section analysis, well-log interpretation, seismic attributes, heavy-mineral assemblages, palynological data, paleotopographic restoration, and sequence stratigraphic analysis were integrated to clarify sedimentary facies types, provenance directions, sandbody stacking patterns, and depositional evolution. The study area developed braided river, meandering river, and shore–shallow lacustrin... More >

The North Huazhou area in Weihe Basin, a transition zone between the Ordos Block and Qinling Orogenic Belt, hosts multiple Cenozoic reservoirs critical for helium, geothermal, and tight oil/gas exploration. Based on Well H1 core, logging, and laboratory data, multi-scale analyses of the Sanmen, Zhangjiapo, Lantian-Bahe Formations, and Gaoling Group reveal significant lithological differentiations: the Zhangjiapo Formation is a medium-porosity, medium-permeability reservoir, whereas the Lantian-Bahe Formation exhibits low porosity and permeability. X-ray diffraction confirms dominant siliceous minerals with clay fluctuations reflecting strong hydrodynamic environments. Moderately strong veloc... More >

Oil and gas testing laboratories have long encountered structural challenges including unclear functional roles, the disconnection between research and testing, and ongoing talent attrition, necessitating an intelligent transformation. Embodied intelligence, as an emerging paradigm integrating AI and robotics, features a local inference model of "cloud-device collaboration" that overcomes the limitations of traditional AI detached from the physical environment. Embodied intelligence enables laboratories to transition from "passive testing" to "proactive, intelligence-driven operations". Nonetheless, current deployment remains constrained by high costs and limited technological maturity. A p... More >

Supplementing formation energy through water injection is the main way to develop old oil fields. However, formation non-homogeneity leads to the uncertainty of waterline advancement, which generates residual oil. In order to study the effect of water injection rate on the distribution of water-driven oil, we carried out water injection simulation experiments using the Tankou oilfield as an example. The oil saturation contour maps of several time points in the water-driven oil process were plotted by determining the trend of resistance value changes. We studied the drive path during the water-driven oil process, determined the location of residual oil distribution in the plane and longitudin... More >

The expansion of transportation infrastructure into geologically complex mountainous regions of China has increased encounters with gas-bearing non-coal strata during tunnel construction. Unlike coal-measure gas systems, gas occurrences in carbonate, clastic, and metamorphic rocks present distinct challenges due to multi-source origins, structurally controlled accumulation, and abrupt outburst mechanisms. This review examines existing research to establish a conceptual framework for this hazard category. Analysis of gas sources, reservoir characteristics, and geological controls indicates that non-coal gas tunnels require theoretical approaches distinct from coal-gas methodologies. A genetic... More >

The southern Sichuan Basin is rich in natural gas and is a key area for hydrocarbon exploration. Due to multi-phase tectonic movements, structural characteristics and preservation conditions are critical for gas accumulation. Focusing on the Middle Permian Maokou Formation in the LY area, this study analyzes the regional and local structural framework to assess structural features and their impact on preservation conditions. Using indicators such as deformation intensity, caprock properties, formation water chemistry, and pressure coefficients, an evaluation system is established to identify favorable exploration zones. Results show that the LY area lies in the southern Sichuan low-steep str... More >

Laser Raman spectroscopy is a promising technique for real-time oil and gas detection in drilling fluids during drilling operations; however, the distribution of crude oil and its coupling with Raman spectral responses under varying temperature conditions remain insufficiently understood, which limits its quantitative applications in downhole environments. This study investigates the temperature- and concentration-dependent behavior of crude oil in oil-containing drilling fluids and develops a quantitative analytical method based on Raman spectroscopy for geological guidance. Crude oil is modeled as dispersed droplets within a continuous fluid phase, and Raman spectra are collected under dif... More >

Mineral exploration faces challenges from complex geological architectures and subtle geophysical expressions of mineralization. This study proposes a joint gravity–magnetic machine learning framework integrating magnetic anomaly, analytic signal, gravity, and Source Parameter Imaging depth estimates to enhance mineralization prediction in Nigeria's Middle Benue Trough and adjoining basement terrain. Five supervised algorithms were evaluated, with Random Forest achieving the highest performance (accuracy=0.954, precision=0.889, recall=0.819, macro-F1=0.850, ROC-AUC=0.978). Correlation analysis revealed low feature redundancy, while unsupervised clustering confirmed structural partitions co... More >