Exploration and Development Research Institute of PetroChina Southwest Oil & Gas Field Company (China)

The geochemistry and chlorine isotope revealed the origin and evolution of the Late Eocene evaporites in the Qianjiang Depression, Jianghan Basin

黄志国, Kai Yan, Yang Li, Yuzhao Wang et autres

The thick evaporites within the Qianjiang depression are frequently considered a significant source of potassium-rich brine in the depression. This study conducted mineralogical, geochemical, and isotopic analyses on the late Eocene evaporites in the Qianjiang depression to investigate the origin and evolution …

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Accurate and Interpretable Prediction of Exploration Input–Output Matching Under Data Scarcity: An Ensemble Learning Framework

Xiao Chen, Hui Liu, Weiyun Zhan, Haitao Li et autres

Accurate prediction of input–output relationships in natural gas exploration is essential for improving exploration efficiency and optimizing investment allocation. However, this task is severely hindered by data sparsity and strong nonlinear characteristics inherent in oil and gas exploration systems, rendering conventional statistical …

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A Novel Permeability Prediction Method for Tight Sandstones Based on Nuclear Magnetic Resonance T2 Spectra: A Case Study From the Sichuan Basin, China

WenHao Xiong, Huazhong Yang, Chong Zhang, Xiaoyong Xia

Summary The pore structure of tight sandstone is complex, and its permeability is extremely low. Conventional permeability calculation methods that are widely applied in traditional reservoirs are often not suitable for tight sandstone formations. Accurately evaluating permeability has long been a key …

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Study of Sulfur Deposition Pattern of High-Sulfur Natural Gas Under Aqueous Conditions

Li Wang, Yan Yang, Ying Wan, D Zhang et autres

China is rich in high-sulfur natural gas resources. During reservoir development, reservoir temperature and pressure reduction induces the precipitation of elemental sulfur. Subsurface sulfur deposition seriously affects the recovery and the stable production of high-sulfur gas reservoirs. This study utilized multiple experimental …

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Reservoir-scale numerical simulation of enhanced gas recovery coupled with CO2 multi-storage mechanisms in water-bearing tight sandstone gas reservoir

Jiangtao Hu, Shenglai Yang, Yiqi Zhang, Huixuan Jiang et autres

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Biomarkers, carbon and mercury isotopes constrain the natural gas sources in the Middle Permian Maokou Formation, northwestern Sichuan Basin, China

Qian Pang, Guang Hu, Zhang Xi-hua, Cong Chen et autres

The identification of gas source in deep and ultra-deep gas reservoirs formed by multiple sets of potential source rocks has always been a challenging issue, primarily attributed to the parameter failures resulting from the high-overmaturity gas reservoirs. The Sichuan Basin, China, contains …

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An auto-prompting Segment Anything Model for dual-modal grain segmentation in rock images

Yijun Wang, Dongyu Zheng, Mingcai Hou, Hongjun Li et autres

Accurate segmentation of particles in rock thin sections is essential for provenance reconstruction and sedimentary environment interpretation. The Segment Anything Model (SAM), a large-scale foundation segmentation model, has demonstrated strong performance and generalization across diverse domains. However, its application to petrographic image …

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Characteristics of limestone reservoirs and sedimentary controls: a study in the Sichuan Basin

Huiwen Huang, Yuhan Huang, Fei Huo, Xueyan Wu et autres

In 2020, a novel unconventional reservoir exhibiting coexisting oil and gas was discovered within the Leikoupo Formation in the central Sichuan Basin. Characterized by extra-low porosity and low permeability, the genesis of the reservoir pores has not been systematically investigated. This study …

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Mechanisms of fabric-selective microbialite karst: a case study of second member of Sinian Dengying Formation, Sichuan Basin

Xingpeng SHAO, Jinmin SONG, Shugen LIU, Gang ZHOU et autres

The microbialite karst reservoirs in the second member of Sinian Dengying Formation, Sichuan Basin, are a recent exploration hotspot, and important exploration breakthroughs have been achieved in the Penglai and Daxingchang areas. However, the understanding of dissolution mechanisms and distribution patterns of …

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Catching fraudulent “invisible hands”: An approach to finding associative dense blocks in bipartite graphs

Yili Ren, Hao Lin, Jiazhou Yu, Zhou Feng et autres

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Complex Pressure Distribution and Genesis Analysis of the Shaximiao Formation in Central and Western Sichuan Basin

Yilin Liang, Lurui Dang, Xiaojuan Wang, Dongxia Chen et autres

The distribution and evolution of complex formation pressures fundamentally control natural gas accumulation patterns and the prediction of favorable zones. To elucidate the controlling factors behind complex pressure distribution in tight sandstone gas reservoirs with source-reservoir separation, this study investigated the Shaximiao …

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Integrated modeling and economic assessment of hydrogen storage with wellbore-reservoir-thermo-hydro-mechanical-diffusion coupling

Xinyuan Gao, Shenglai Yang, Y X Zhang, Baiyan He et autres

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