Acta Geologica Sinica ‐ English Edition最新文献_第3页

High-resolution Geochemistry in the Lucaogou Formation, Junggar Basin: An Assessment of Heterogeneous Shale Resources 准噶尔盆地芦草沟组高分辨率地球化学特征：非均质页岩资源评价

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15262

Shijie SUN, Bin ZHANG, Xiaomei WANG, Hua TIAN, Shuichang ZHANG, Guiting HOU

{"title":"High-resolution Geochemistry in the Lucaogou Formation, Junggar Basin: An Assessment of Heterogeneous Shale Resources","authors":"Shijie SUN, Bin ZHANG, Xiaomei WANG, Hua TIAN, Shuichang ZHANG, Guiting HOU","doi":"10.1111/1755-6724.15262","DOIUrl":"https://doi.org/10.1111/1755-6724.15262","url":null,"abstract":"Controlled by fluctuating paleoclimates and sedimentary environments, the organic and inorganic features of the Lucaogou Formation exhibit strong heterogeneity in the vertical profile, challenging conventional geological interpretation. To elucidate the possible influence of heterogeneity on resource evaluation, a high-resolution sampling approach was applied to an 86.2 cm long core from the Lucaogou Formation of the Jimsar sag in the Junggar Basin. 86 sets of samples were micro-drilled from the core and subjected to comparative Rock-Eval pyrolysis. Following the classical guidelines, the organic abundance, kerogen type, and maturity of source rocks were exhaustively analyzed. Experimental results revealed that organic richness and composition vary significantly under different sedimentary backgrounds, which in turn leads to differential hydrocarbon generation. The combination of hydrocarbon generation, transport, and expulsion results in peculiar patterns for hydrocarbon accumulation in the Lucaogou Formation. Laminated shales in the Lucaogou Formation serve as both hydrocarbon source rocks and reservoirs, with laminae being migration pathways. Organic-rich dolomites in the Lucaogou Formation have a considerable hydrocarbon-generating capacity and present the characteristics of self-generation and self-storage. However, massive mudstones act purely as hydrocarbon source rocks.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"177-193"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrothermal Control by Deep Hidden Faults on Geothermal Systems in Sedimentary Basins: A Case Study of the Cangdong Fault in the North China Basin 深隐断层对沉积盆地地热系统的热液控制——以华北盆地沧东断裂为例

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15263

Xiaoxiao YIN, Jianwang LIN, Hu LI, Huanqing LI, Lufei DONG, Jiaxian YAN, Sen ZHANG, Zheng LI

{"title":"Hydrothermal Control by Deep Hidden Faults on Geothermal Systems in Sedimentary Basins: A Case Study of the Cangdong Fault in the North China Basin","authors":"Xiaoxiao YIN, Jianwang LIN, Hu LI, Huanqing LI, Lufei DONG, Jiaxian YAN, Sen ZHANG, Zheng LI","doi":"10.1111/1755-6724.15263","DOIUrl":"https://doi.org/10.1111/1755-6724.15263","url":null,"abstract":"Large basins are currently the global focus for geothermal development, with their hydrothermal system being controlled by a variety of factors, such as basement relief and fracture development. Donglihu is located at the north of the Cangxian uplift in the North China Basin, the concentrated geothermal resource development zone in North China. This study systematically collects temperature logging data and long-term dynamic monitoring of water level and water quality as well as group well tracer test data carried out in this area in recent years, on the basis of which the hydrothermal controlling role of the deep hidden faults is systematically analyzed. The results show that the Cangdong fault communicates with different geothermal reservoirs in the shallow part and plays a specific role in the water-heat channel of the local area. As a result, the high-value area of the geothermal temperature gradient in the sedimentary layer of the Donglihu area is distributed around the Cangdong fault. The geothermal reservoir temperature of the Minghuazhen Formation within the influence of the fault is also significantly higher than the regional average, the hydraulic head of different geothermal reservoirs showing a consistent and synergistic trend. However, the water quality has been stable for many years without any apparent changes. This understanding has a particular significance for further deepening understanding of the geothermal genesis mechanism in sedimentary basins and guiding future geothermal exploration and development in the Donglihu area.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"243-257"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Qixiangzhan Lava Flow at the Tianchi Volcano: Eruptive Dynamics, Emplacement Mechanism and Implications for the Formation of Long-lived Magmatic Systems Prior to Caldera-forming Eruptions 天池火山七香盏熔岩流：喷发动力学、侵位机制及其对破火山口形成前长寿命岩浆体系形成的启示

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15271

Jiahui LI, Xuanlong SHAN, Jian YI, Chengzhi WU, Ventura GUIDO, Pengcheng LIU, Jiannan GUO, Wei WANG

{"title":"The Qixiangzhan Lava Flow at the Tianchi Volcano: Eruptive Dynamics, Emplacement Mechanism and Implications for the Formation of Long-lived Magmatic Systems Prior to Caldera-forming Eruptions","authors":"Jiahui LI, Xuanlong SHAN, Jian YI, Chengzhi WU, Ventura GUIDO, Pengcheng LIU, Jiannan GUO, Wei WANG","doi":"10.1111/1755-6724.15271","DOIUrl":"https://doi.org/10.1111/1755-6724.15271","url":null,"abstract":"The 7 ka old Qixiangzhan lava flow (QXZ, Tianchi volcano) represents the last eruptive event before the 946 CE, caldera-forming ‘Millennium’ eruption (ME). Petrographic, whole rock, mineral composition, Sr-Nd isotopic data on QXZ show that: (a) the lava consists of two components, constituted by comenditic obsidian fragments immersed in a continuous, aphanitic component; (b) both components have the same geochemical and isotopic variations of the ME magma. The QXZ and ME comendites result from fractional crystallization and crustal assimilation processes. The temperature of the QXZ magma was about 790°C and the depth of the magma reservoir around 7 km, the same values as estimated for ME. QXZ had a viscosity of 105.5–109 Pa s and a velocity of 3–10 km/yr. The emplacement time was 0.5–1.6 yr and the flow rate 0.48–1.50 m3/s. These values lie within the range estimated for other rhyolitic flows worldwide. The QXZ lava originated through a mixed explosive–effusive activity with the obsidian resulting from the ascent of undercooling, degassing and the fragmentation of magma along the conduit walls, whereas the aphanitic component testifies to the less undercooled and segregated flow at the center of the conduit. The QXZ lava demonstrates the extensive history of the ME magma chamber.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"114-125"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rockburst Intensity Prediction based on Kernel Extreme Learning Machine (KELM) 基于核极限学习机的岩爆强度预测

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15267

Yidong XIAO, Shengwen QI, Songfeng GUO, Shishu ZHANG, Zan WANG, Fengqiang GONG

{"title":"Rockburst Intensity Prediction based on Kernel Extreme Learning Machine (KELM)","authors":"Yidong XIAO, Shengwen QI, Songfeng GUO, Shishu ZHANG, Zan WANG, Fengqiang GONG","doi":"10.1111/1755-6724.15267","DOIUrl":"https://doi.org/10.1111/1755-6724.15267","url":null,"abstract":"As one of the most serious geological disasters in deep underground engineering, rockburst has caused a large number of casualties. However, because of the complex relationship between the inducing factors and rockburst intensity, the problem of rockburst intensity prediction has not been well solved until now. In this study, we collect 292 sets of rockburst data including eight parameters, such as the maximum tangential stress of the surrounding rock σθ, the uniaxial compressive strength of the rock σc, the uniaxial tensile strength of the rock σt, and the strain energy storage index Wet, etc. from more than 20 underground projects as training sets and establish two new rockburst prediction models based on the kernel extreme learning machine (KELM) combined with the genetic algorithm (KELM-GA) and cross-entropy method (KELM-CEM). To further verify the effect of the two models, ten sets of rockburst data from Shuangjiangkou Hydropower Station are selected for analysis and the results show that new models are more accurate compared with five traditional empirical criteria, especially the model based on KELM-CEM which has the accuracy rate of 90%. Meanwhile, the results of 10 consecutive runs of the model based on KELM-CEM are almost the same, meaning that the model has good stability and reliability for engineering applications.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"284-295"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geochronology and Geochemistry of the Permian Granitoids from the Alxa Area, Inner Mongolia, China: Constrains on the Permian Evolution of the Central Asian Orogenic Belt 内蒙古阿拉善地区二叠系花岗岩的年代学和地球化学：对中亚造山带二叠系演化的制约

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15261

Haibin HUANG, Yuruo SHI, Lawford J. ANDERSON, Yuelan KANG

{"title":"Geochronology and Geochemistry of the Permian Granitoids from the Alxa Area, Inner Mongolia, China: Constrains on the Permian Evolution of the Central Asian Orogenic Belt","authors":"Haibin HUANG, Yuruo SHI, Lawford J. ANDERSON, Yuelan KANG","doi":"10.1111/1755-6724.15261","DOIUrl":"https://doi.org/10.1111/1755-6724.15261","url":null,"abstract":"We report new SHRIMP zircon U-Pb ages, zircon Lu-Hf isotopic and whole rock geochemical data from Permian granitoids located in the Alxa area of Inner Mongolia, China. In combination with published geochronological and geochemical data, the granitoids in the region can be divided into two age groups: ca. 285 Ma and ca. 269 Ma. The granitoids of the first group are mainly composed of calc-alkaline to high-K calc-alkaline, weakly peraluminous I-type granodiorites with ɛHf(t) values of -19.6 to -4.3, which demonstrates evidence of crustal reworking; the granitoids of the second group, however, mainly consist of A-type granites that are high-K calc-alkaline to shoshonite, metaluminous to weakly peraluminous, and have high 10,000 × Ga/Al ratios (2.59–3.12) and ɛHf(t) values ranging from –11.3 to –2.7, all of which demonstrates a mixed crust-mantle source. We interpret the granitoids of the first group to have formed during the subduction of Central Asian oceanic crust and the second group to have formed by the asthenospheric upwelling caused by the formation of slab windows during late ocean ridge subduction.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"83-99"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Petrogenesis and Metallogenic Implications of A-type Granites in the Mid–Late Jurassic Dayishan Complex, Southern Hunan Province, South China 湘南中晚侏罗世大山杂岩a型花岗岩成因及成矿意义

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15265

Meng ZHANG, Yaohui JIANG, Yunchao LIU, Boning HAN

{"title":"Petrogenesis and Metallogenic Implications of A-type Granites in the Mid–Late Jurassic Dayishan Complex, Southern Hunan Province, South China","authors":"Meng ZHANG, Yaohui JIANG, Yunchao LIU, Boning HAN","doi":"10.1111/1755-6724.15265","DOIUrl":"https://doi.org/10.1111/1755-6724.15265","url":null,"abstract":"The petrogenesis and genetic link to polymetallic mineralization of the granites in the Dayishan complex, southern Hunan province remain debated. Here, we present an integrated study on the petrology, zircon U-Pb ages and whole-rock geochemistry for this complex. Our findings indicate that the southern complex consists of (amphibole-bearing) biotite granites and muscovite granites emplaced at 153–151 Ma, and the central and northern complex consists of two-mica granites and tourmaline-bearing muscovite granites, respectively with the former emplaced at 164 Ma and the latter at 150 Ma. The (amphibole-bearing) biotite granites have SiO2 contents of 68.0–73.8 wt% and are enriched in alkalis and rare earth elements and depleted in Sr and Ba. They display Zr + Y + Ce + Nb > 350 ppm and 10000 × Ga/Al > 2.6 along with high zircon saturation temperatures (821–883°C). The two-mica granites and (tourmaline-bearing) muscovite granites have high SiO2 (74.4–77.3 wt%) and low Ga/Al, Zr + Nb + Ce + Y, K/Rb, Zr/Hf, and Nb/Ta along with low zircon saturation temperatures (709–817°C). Geochemical characteristics suggest that the (amphibole-bearing) biotite granites are A-type granites generated through shallow dehydration melting of early Paleozoic granitoids, and that the two-mica granites and (tourmaline-bearing) muscovite granites are fractionated A-type granites produced through fractionation crystallization from the (amphibole-bearing) biotite granites accompanied by fluid fractionation.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"100-113"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-pressure Granulite-facies Metamorphism and Anatexis in Continental Collision Orogen: Evidence from the Mafic Granulite and Leucosomes in South Altun, Northwestern Qinghai–Tibet Plateau 陆相碰撞造山带高压麻粒岩相变质与深熔作用：来自青藏高原西北部阿尔金南部基性麻粒岩和白粒岩的证据

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15264

Jing GUO, Yunshuai LI, Jianxin ZHANG

{"title":"High-pressure Granulite-facies Metamorphism and Anatexis in Continental Collision Orogen: Evidence from the Mafic Granulite and Leucosomes in South Altun, Northwestern Qinghai–Tibet Plateau","authors":"Jing GUO, Yunshuai LI, Jianxin ZHANG","doi":"10.1111/1755-6724.15264","DOIUrl":"https://doi.org/10.1111/1755-6724.15264","url":null,"abstract":"Deciphering high-pressure granulite-facies metamorphism and anatexis within a collisional orogeny can provide crucial constraints on geodynamic evolution and melt activity during subduction and exhumation. Combining petrographic observations, mineral chemistry, REE in Grt-Cpx thermobarometry, and previous work, at least four stages are suggested for the metamorphic evolution of the mafic granulites in the South Altun, including the protolith stage, the high-pressure granulite-facies stage (909–1037°C and 17.3–30 kbar), medium-pressure granulite-facies overprint (9.1–11.9 kbar and 753–816°C), and subsequent late amphibolite-greenschist-facies metamorphism. Zircon U-Pb dating shows that the mafic granulites underwent high-pressure granulite-facies metamorphism at 497.2 ± 3.7 Ma, while the leucosome formed at 498.2 ± 2.9 Ma. Thus, the leucosomes from the host mafic granulite may have been formed at the high-pressure granulite-facies metamorphic event. The characteristics of zircon morphology, mineral inclusions, low Th/U values, HREE enrichment, and negative Eu anomalies indicate that these zircons from the leucosome were formed from the metamorphic melts. The characteristics of whole-rock major and trace elements as well as Hf isotopic features of zircons between the leucosomes and the host mafic granulite indicate that the melt may have been generated by the partial melting of the host mafic granulite.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"53-68"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tectonic Evolution of the Ailao Shan–Red River Fault since the Middle Miocene from Apatite Fission Track Thermochronology and its Implications for Tibetan Plateau Growth 从磷灰石裂变径迹热年代学看哀牢山-红河断裂中新世以来的构造演化及其对青藏高原生长的指示意义

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15272

Wei GONG, Chaoyang LI, Liang JIANG, Yuyan WANG, Hongyu LI, Lihong ZHAO, Faqiang ZHAO

引用次数: 0

Investigating the Influence of Parent Rock and Sedimentation on the Diagenesis of Tuffaceous Clastic Rock: An Example from the Lower Cretaceous Junggar Basin, China 母岩和沉积对凝灰质碎屑岩成岩作用的影响——以准噶尔盆地下白垩统为例

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15273

Sirui CHEN, Benzhong XIAN, Youliang JI, Jiaqi LI

{"title":"Investigating the Influence of Parent Rock and Sedimentation on the Diagenesis of Tuffaceous Clastic Rock: An Example from the Lower Cretaceous Junggar Basin, China","authors":"Sirui CHEN, Benzhong XIAN, Youliang JI, Jiaqi LI","doi":"10.1111/1755-6724.15273","DOIUrl":"https://doi.org/10.1111/1755-6724.15273","url":null,"abstract":"This study focuses on tuffaceous clastic rocks of the Lower Cretaceous Qingshuihe Formation in the southern margin of Junggar Basin. It aims to explore the influence of sedimentation and parent rock on this kind of reservoir development. The results show that the tuffaceous components formed by the denudation of ultramafic and mafic rocks can transform into chlorite coating or hematite, while those from intermediate rock denudation can be dissolved or transformed into illite. Sedimentary facies and lithofacies are essential in controlling the evolutionary result of tuffaceous components. Matrix-supported medium conglomerate and grain-supported medium-fine conglomerate that developed in the fan delta plain, with a closed original geochemical systems, have been in the oxidizing environment for a long time. The tuffaceous matrices mainly transforms into hematite or illite. These minerals occupy the primary pores and are difficult to dissolve by felsic fluids, which inhibits the development of high-quality reservoirs. The grain-supported sandy fine conglomerate developed in the fan delta front was in the underwater reductive environment with an open original geochemical system. The tuffaceous matrices not only can transform into chlorite coating to strengthen the particle's compaction resistance, but also can be fully dissolved, which promotes the formation of high-quality reservoirs.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"159-176"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Influence of Microbial Community on Oil Reservoirs: A Case Study on the Mesozoic Natural Gas in the Pengyang Area, Southwestern Ordos Basin, China 微生物群落对油藏的影响——以鄂尔多斯盆地西南部彭阳地区中生界天然气为例

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-02-18 DOI: 10.1111/1755-6724.15274

Ting SHANG, Xiaobing NIU, Mingrui LI, Zhongyi ZHANG, Xuan HUANG, Tianyou HAN, Xiaolei ZHANG, Jihong LI, Meijuan CHU, Xin LIU

{"title":"The Influence of Microbial Community on Oil Reservoirs: A Case Study on the Mesozoic Natural Gas in the Pengyang Area, Southwestern Ordos Basin, China","authors":"Ting SHANG, Xiaobing NIU, Mingrui LI, Zhongyi ZHANG, Xuan HUANG, Tianyou HAN, Xiaolei ZHANG, Jihong LI, Meijuan CHU, Xin LIU","doi":"10.1111/1755-6724.15274","DOIUrl":"https://doi.org/10.1111/1755-6724.15274","url":null,"abstract":"The formation of Mesozoic natural gas in the Pengyang area of southwestern Ordos Basin is discussed, from the perspective of microbial community characteristics, in order to clarify the relationship between the origin of natural gas and its associated indigenous microbial community. The types and diversity of indigenous microbial communities associated with the oil reservoir were studied by means of collecting reservoir formation water samples from exploration wells. The indigenous microbial communities in the Chang 8 member of the Yanchang Formation were primarily distributed within Proteobacteria and Firmicutes, including the specific species and genera of Methylobacter, Pseudomonas, Haibacter, Toxobacillus, Acinetobacter and Adura actinomyces. The results of diversity analysis shows that the number of common genes was 5448, while the number of unique genes and information was less. This reflects the fact that the strata in the study area are relatively closed and not invaded by external water sources, which leads to the development of biological community diversity. In conjunction with the analysis of geochemical characteristics of oil and gas reservoirs in this area, this indicates that the study area possesses the necessary geological conditions for microbial degradation. It is the first time that the species and diversity of the indigenous microbial community in the Ordos Basin have been analyzed, showing that microbial degradation is the main cause of natural gas formation here, changes the characteristics of crude oil in this area and provides first-hand information on the impact of indigenous microorganisms on the reservoir.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 1","pages":"144-158"},"PeriodicalIF":3.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143439177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0