Yang Gao

黑龙江省洼兴钼多金属矿床成矿机制: 流体包裹体、H-O-C-S同位素及白钨矿微量元素证据

Yang LIU, HongChao WANG, Yang Gao, YuXin MA et autres

洼兴钼多金属矿床(钼金属储量59.3万t,钼平均品位0.085%)位于中国东北地区小兴安岭-张广才岭中部。矿床中I矿带的铜矿化和II矿带的钼矿化均主要表现为花岗质岩体中的含矿石英细脉或网脉;钨矿化以白钨矿的形式在I矿带产于云英岩化蚀变岩中,在II矿带存在于暗色矿物集合体和石英脉中。II矿带钼-钨成矿作用可划分为4个阶段:(1)石英-钾长石阶段(含白钨矿);(2)石英-辉钼矿阶段;(3)石英-硫化物阶段;(4)石英-碳酸盐阶段。矿石中辉钼矿、黄铁矿和黄铜矿的总体δ34S值变化范围为-1.0‰~5.1‰,硫同位素组成特征表明东、西矿带成矿流体中的初始硫均来自岩浆。流体包裹体以及矿石中石英和方解石的氢-氧-碳同位素数据表明,初始成矿流体具有明显的岩浆特征,并且在流体演化过程中混合了大气降水。基于详细的流体包裹体研究,洼兴矿床钼成矿作用流体演化过程为:(1)第一阶段成矿流体处于静岩压力条件(压力约为20~30MPa,深度约为2~3km),流体温度范围集中在360~400℃;(2)第二阶段流体从静岩压力向静水压力条件转变(温度约为320~360℃,压力约为20MPa),伴随着大气降水的持续混入;(3)第三阶段流体已完全转变为静水压力条件(温度约为240~320℃,压力约为5~10MPa),且发生了大气降水的广泛混合;(4)第四阶段流体表现为低温(<200℃)、低盐度(<8% NaCleqv)以及较低的捕获压力。热液体系温度的下降,以及pH和氧逸度(fO2)的变化是控制洼兴矿床中钼沉淀的重要因素。产于I(西)矿带和II(东)矿带的不同类型白钨矿微量元素组成的规律性差异表明两矿带成矿流体具有不同的性质和条件。

Multifractal Characteristics of Heterogeneous Pore-Throat Structure and Insight into Differential Fluid Movability of Saline-Lacustrine Mixed Shale-Oil Reservoirs

Wei Yang, Ming Xie, Haodong Hou, Zhenxue Jiang et autres

The root causes forcing the differential pore-throat performances and crude oil recoverability in heterogeneous shale lithofacies of saline-lacustrine fine-grained mixed sedimentary sequences are still debated. Especially application cases of fractal theory in characterizing pore-throat heterogeneity are still lacking and the significance of …

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Design of position sensorless high-speed PMSM controller based on FPGA

Yang Gao, Yongxing Wang, Junxia Song, Guobing Zhang et autres

Aiming at the development requirements of miniaturization and high performance of motor controller, a miniaturized high-speed permanent magnet synchronous motor (PMSM) controller without position sensors based on FPGA is designed in this paper. The motor controller uses a three-phase full-bridge inverter circuit …

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Unsupervised Automated Track Inspection Based on Symmetrical Teacher-Student Network and Cross-Modal Feature Alignment Attention

Yang Gao, Zhiwei Cao, Yong Qin, Tao Jing et autres

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Investigation of Applications of 3D Printing to Oilfield Equipment: A Case Study of Hydrocyclones

Xiaojie Zhao, Jue Wang, Yang Gao, Wenchang Wang et autres

Abstract Three-dimensional (3D) printing offers several advantages, including flexible design, faster production, cost-effectiveness, suitability for small-batch production and reduction of carbon emissions. In particular, by optimizing the structure of oilfield equipment and adjusting the microstructure of metal 3D printed parts, high-performance components …

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Environmental applications and risks of engineered nanomaterials in removing petroleum oil in soil

Yang Gao, Letao Zhou, Shaohu Ouyang, Jing Sun et autres

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Continental subduction-triggered carbonate metasomatism of the lithospheric mantle: Implications for the deep carbon cycle

Yang Gao, Keqing Zong, Junfeng Zhang, Luye Zhang et autres

Table 1. Mineral assemblage of the Qixia xenoliths in this study.Table 2. In situ Sr isotopic compositions of clinopyroxene in Qixia xenoliths measured by LA-MC-ICP-MS.Table S1-S5 lists the major (wt%) and trace (µg/g) element compositions in USGS reference glasses and minerals (including …

Multi-Scale Fractal Characteristics of the Pore System in Low-Permeability Conglomerates from the Junggar Basin

Jiayu Zheng, Weichao Tian, Yang Gao, Zhigang Wen et autres

The pore structure and its complexity play a critical role in fluid migration and recovery efficiency. Multiple pore types, broad pore size distribution (PSD), and extremely irregular pore morphology hinder the comprehensive investigation of pore systems and their complexity in low-permeability conglomerates. …

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Quantifying the Microdistribution of Different Fluid Types in the Multiscale Pore Throat Structure of Low-Permeability Conglomerates

Weichao Tian, Shuangfang Lu, Zhigang Wen, Chen Xiu et autres

The volumes of different fluid types and the pore throat structure in low-permeability reservoirs are crucial parameters for understanding flow mechanisms and predicting production performance. The previously applied methods for distinguishing different fluid types are mainly based on T 2 spectra under …

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Effect of lithofacies on differential movable fluid behaviors of saline lacustrine fine-grained mixed sedimentary sequences in the Jimusar sag, Junggar Basin, NW China: Forcing mechanisms and multi-scale models

Wei Yang, Yaohua Wang, Ming Xie, Yingyan Li et autres

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Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine Basin

Ming Xie, Wei Yang, Mingzhu Zhao, Yingyan Li et autres

The Permian Lucaogou Formation has developed mixed shale reservoirs, but there are few studies on the diagenetic facies, and the control effect of differential diagenesis on the reservoir capacity of shale oil reservoirs in this area is not clear. Therefore, shale samples …

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Research on Sand Ground Ratio Prediction Method Based on Neural Network Machine Learning

Dong-cheng Lin, Fang-chun Qu, Yang Gao, Long Chen et autres

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