Application of borehole images in the characterization of volcanic paleoenvironments with implications for the exploration of hydrocarbons in Brazilian basins
June 2025
Conventional borehole image log interpretation of linear fractures on volcanic rocks, represented as sinusoids on unwrapped cylinder projections, is relatively straight-forward, however, interpreting...
Share article
Circle structure and orderly hydrocarbon accumulation of whole petroleum system in a continental fault basin: A case study of Kong-2 Member in Cangdong Sag, Bohai Bay Basin, China
June 2025
Guided by the fundamental principles of the whole petroleum system, the control of tectonism, sedimentation, and diagenesis on hydrocarbon accumulation in a fault basin is studied using the data of...
Share article
Exploration breakthrough and hydrocarbon accumulation conditions of Mesozoic volcanic rocks in Bodong Low Uplift, Bohai Bay Basin, China
June 2025
The Mesozoic volcanic rocks of the Bodong Low Uplift in the Bohai Bay Basin have been studied and explored for years. In 2024, the LK7-A well drilled in this region tested high-yield oil and gas flows...
Share article
Structural characteristics of faults in Wangfu fault depression and their control on coal-rock gas enrichment, Songliao Basin, NE China
June 2025
Taking the Wangfu fault depression in the Songliao Basin as an example, on the basis of seismic interpretation and drilling data analysis, the distribution of the basement faults was clarified, the...
Share article
Theory and practice of energy-focused fracturing development technology
June 2025
Currently, unconventional reservoirs are characterized by low single well-controlled reserves, high initial production but fast production decline. This paper sorts out the problems of energy dispersion...
Share article
Multi-detachment-controlled thrust structures and deep hydrocarbon exploration targets in southern margin of Junggar Basin, NW China
June 2025
For deep prospects in the foreland thrust belt, southern Junggar Basin, NW China, there are uncertainties in factors controlling the structural deformation, distribution of paleo-structures and detachment...
Share article
The coal-formed gas theory promoting China from a gas-poor country to a major gas-producing country in the world
June 2025
In the late 1970s, the theory of coal-formed gas began to take root, sprout, develop, and improve in China. After decades of development, a complete theoretical system was finally formed. The theory...
Share article
Optimal bit selection for large-diameter wellbore drilling in an ultra-deep well
June 2025
To optimize the bit selection for large-diameter wellbore in the upper section of an ultra-deep well S-1, a full-well dynamic model integrating drill string vibration and bit rock-breaking was established...
Share article
Technology and understanding of post-fracturing coring in three-dimensional development zone of Fuling shale gas, Sichuan Basin, SW China
June 2025
The core sampling experiments were conducted after hydraulic fracturing in the three-dimensional development zone of Fuling shale gas. Six coring wells of different well types were systematically designed....
Share article
Optimization of fracturing parameters in multi-layer and multi-period cube development infill well pad: A case study on a three-layer cube development well pad of Sichuan Basin, SW China
June 2025
The method for optimizing the hydraulic fracturing parameters of the cube development infill well pad was proposed, aiming at the well pattern characteristic of “multi-layer and multi-period” of the...
Share article
Multi-scale intelligent fusion and dynamic validation for high-resolution seismic data processing in drilling
June 2025
During drilling operations, the low resolution of seismic data often limits the accurate characterization of small-scale geological bodies near the borehole and ahead of the drill bit. This study investigates...
Share article
Identification indexes and diagrams for natural gas origin: Connotation, significance and application
June 2025
Accurate identification of natural gas origin is fundamental to the theoretical research on natural gas geosciences and the exploration deployment and resource potential assessment of oil and gas. Since...
Share article
Assessment and exploration prospects of the oldest marine shale oil in North China
June 2025
Based on large-field rock thin section scanning, high-resolution field emission-scanning electron microscopy (FE-SEM), fluorescence spectroscopy, and rock pyrolysis experiments of the Mesoproterozoic...
Share article
Development technologies and models of different types of gas reservoirs in Ordos Basin, NW China
June 2025
This study systematically reviews the development history and key technological breakthroughs of large gas fields in the Ordos Basin, and summarizes the development models of three gas reservoir types,...
Share article
Lamina combination characteristics and differential shale oil enrichment mechanisms of continental organic-rich shale: A case study of Triassic Yanchang Formation Chang 73 sub-member, Ordos Basin, NW China
April 2025
The lamina (combination) types, reservoir characteristics and shale oil occurrence states of organic-rich shale in the Triassic Yanchang Formation Chang 73 sub-member in the Ordos Basin were systematically...
Share article
Paleoclimate, paleoenvironment and source rock development model of Eocene in Shunde Sag, Pearl River Mouth Basin, China
April 2025
Based on the comprehensive analysis of data from petrology and mineralogy, well logging, seismic surveys, paleontology, and geochemistry, a detailed research was conducted on paleoenvironmental and...
Share article
Response of organic matter pore development to functional groups in overmature marine shale: Insights from AFM-IR spectroscopy
April 2025
Taking the Lower Silurian Longmaxi Formation shale in the Sichuan Basin as an example, this study employs atomic force microscopy-based infrared (AFM-IR) spectroscopy to analyze the submicron-scale...
Share article
Controlling factors and exploration potential of shale gas enrichment and high yield in Permian Dalong Formation, northern Sichuan Basin, SW China
April 2025
Based on the basic data of drilling, logging, testing and geological experiments, the geological characteristics of the Permian Dalong Formation marine shales in the northern Sichuan Basin and the factors...
Share article
Formation and preservation of pores in deep limestone reservoirs: A case study of Upper Permian Changxing Formation, central Sichuan Basin, SW China
April 2025
In recent years, drilling data from wells Pengshen 10, Heshen 9, Tongshen 17 and Zhengyang 1 in the Sichuan Basin have confirmed the presence of a set of porous reef-beach limestone reservoirs in the...
Share article
Visualization simulation experiments and porosity evolution mechanisms of deep to ultra-deep carbonate reservoirs
April 2025
To address the challenges in studying the pore formation and evolution processes, and unclear preservation mechanisms of deep to ultra-deep carbonate rocks, a high-temperature and high-pressure visualization...
Share article
Source and exploration potential of the ultra-deep Cambrian petroleum in Well XT-1, Tarim Basin, NW China
April 2025
The ultra-deep (deeper than 8 000 m) petroleum in the platform-basin zones of the Tarim Basin has been found mainly in the Lower Paleozoic reservoirs located to the east of the strike-slip fault F5...
Share article
A shut-in pressure calculation method for high-temperature high-pressure wells in deepwater fractured formations based on thermo-hydro-mechanical coupling
April 2025
By comprehensively considering the influences of temperature and pressure on fluid density in high temperature and high pressure (HTHP) wells in deepwater fractured formations and the effects of formation...
Share article
Deformation and migration characteristics of bubbles moving in gas-liquid countercurrent flow in annulus
April 2025
The gas-liquid countercurrent flow pattern is complex and the bubble migration velocity is difficult to predict in the process of bullheading well killing. The experiment on bubble migration in gas-liquid...
Share article
Fluid characteristics, gas accumulation controlling factors and gas enrichment modes in coal reservoirs: A case study of the Upper Paleozoic in the central-eastern Ordos Basin, NW China
April 2025
Based on the test and experimental data from exploration well cores of the Upper Paleozoic in the central-eastern Ordos Basin, combined with structural, burial depth and fluid geochemistry analyses,...
Share article
Equivalent force model of deformation induced by oil and gas reservoir development and its volume boundary element method solution
April 2025
To address the issue that traditional finite element methods cannot fully consider the semi-infinite earth strata and have lower solution accuracy, a new equivalent force model for induced deformation...
Share article
