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| 1 | Hydrocarbon Geological Conditions and Exploration Potential of Mesozoic–Paleozoic Marine Strata in the South Yellow Sea Basin显示文摘No substantial breakthroughs have been made in hydrocarbon exploration of the South Yellow Sea Basin.It is believed that the Mesozoic-Paleozoic marine sedimentary formation in the South Yellow Sea Basin is similar to that in the Sichuan Basin.Therefore,outcrop,drilling,and seismic data were determined and compared with the research results on petroleum geological conditions in the Yangtze land area,and the hydrocarbon geological conditions were analyzed comprehensively from multiple aspects,such as basin evolution and main source rocks,reservoir characteristics,preservation conditions,and structural traps.The results show that two main stages in the South Yellow Sea Basin(the stable evolution stage of the Mesozoic-Paleozoic marine basin and the Mesozoic-Cenozoic tectonic reformation and basin formation stage)were important for the development and evolution of four sets of main source rocks.Reservoirs dominated by carbonate rocks,three sets of capping beds with good sealing capability,relatively weak magmatic activity,and multiple types of structural traps jointly constituted relatively good hydrocarbon-reservoir-forming conditions.There were four sets of main source-reservoir-cap assemblages and three possible hydrocarbon reservoir types(primary residual-type hydrocarbon reservoir,shallow reformed-type hydrocarbon reservoir,and composite-type hydrocarbon reservoir)developed in the marine strata.It is concluded that the marine strata in the South Yellow Sea Basin have relatively good hydrocarbon potential.The Laoshan Uplift is characterized by stable structure,complete preserved source reservoir cap assemblage,and large structural traps,and thus it is the preferred prospect zone for marine Paleozoic hydrocarbon exploration in this area. | YUAN Yong CHEN Jianwen LIANG Jie XU Ming LEI Baohua ZHANG Yuxi CHENG Qingsong WANG Jianqiang | 2019 | Journal of Ocean University of China2019，18，6： | 7 |
| 2 | 川中地区寒武系洗象池组白云岩Mg同位素特征与成因机制显示文摘明确成岩流体性质、沉积环境演化、富Mg流体来源、流体迁移路径等因素对揭示白云岩成因、理解白云石化过程具有重要意义。以川中地区中—上寒武统洗象池组为例,基于岩石学与沉积旋回分析及微量元素和碳、氧、镁同位素特征,系统分析了沉积-成岩环境的变迁和富Mg流体的迁移规律,探讨了洗象池组白云岩的成因。洗象池组白云石化流体主要为寒武纪的同期海水,白云石化作用发生于准同生—浅埋藏阶段。川中地区洗象池组整体为温暖、干旱亚热带气候背景下的浅水、半咸水—咸水海相沉积,白云石化类型以萨布哈白云石化和渗透回流白云石化为主。洗象池组白云岩δ^(26)Mg值变化趋势与沉积旋回存在耦合关系。当富Mg海水进行垂向迁移时,发生近源渗透回流白云石化作用,白云岩δ^(26)Mg向下逐渐增大;当富Mg海水进行侧向迁移时,发生远源渗透回流白云石化作用,白云岩δ^(26)Mg垂向上无明显变化;在蒸发局限环境中,主要发生萨布哈白云石化作用,白云岩δ^(26)Mg向下逐渐减小。洗象池组白云岩的形成主要受海平面变迁控制,低海平面时期形成薄层状白云岩,高海平面时期多种白云石化作用逐层叠加可形成大规模厚层状白云岩储层。 | 李茜 朱光有 李婷婷 周磊 吴雨轩 田连杰 | 2022 | 石油学报2022，43，11： | 4 |
| 3 | 白云岩成因类型与研究方法进展显示文摘白云岩储层具备巨大的油气勘探潜力,但白云岩成因问题始终存在争议,这极大地干扰了优质白云岩储层的有效预测。为进一步推动白云岩成因问题的研究,系统回顾了近20年来白云岩的成因类型和传统研究方法,以及Mg同位素、团簇同位素、晶体结构和激光原位U-Pb定年等非传统研究方法的研究进展,并对其中存在的问题进行了总结。目前已建立的白云岩成因模式多达20多种,但从本质出发白云岩成因类型可划分为原生白云岩和次生白云岩两类。通过不断探索使白云岩成因理论愈加深入和丰富,其中微生物诱导理论的兴起为原生白云岩的成因提供了更有利的证据,部分次生交代白云岩成因理论也得到了拓展和挑战。基础岩石学、阴极发光、主/微量元素、稀土元素、流体包裹体、碳/氧同位素、锶同位素等传统分析方法为探究白云岩成因做出了卓越的贡献,是探究白云岩成因的基础。非传统白云岩成因研究方法的迅速发展,为白云岩的形成和演化提供了更多有用的信息。Mg同位素可有效示踪富Mg流体来源和重建白云石化的演化过程;团簇同位素测温技术在揭示白云岩成岩温度、恢复白云石化流体性质等方面有着重要意义;白云石晶体结构中保存了其形成过程中的环境、结晶、晶体生长、流体等方面特有的证据,可作为研究白云石形成环境、形成机理的有效手段;激光原位U-Pb定年的绝对年龄对于认识白云岩成岩过程和演化具有重要的价值。然而,白云岩的形成是一个涉及不同地质条件和不同时期的多阶段综合过程,无论是传统还是非传统白云岩研究方法都存在一定的优缺点,在许多情况下,仅用某种单一成因模式或研究手段难以完全解释白云岩的成因。因此,在研究白云岩成因时,切勿简单套用甚至滥用成因模式,而是应该针对具体情况具体分析,并将传统和非传统白云岩分析手段相互结合,综合地质背景、流体性质、来源、动力学和热力学机制,从而给出更为准确和合理的白云岩成因解释。通过对白云岩成因研究的系统回顾和分析,以期为研究白云岩成因提供一些参考和新的启示。 | 朱光有 李茜 | 2023 | 石油学报2023，44，7： | 0 |
| 4 | Indosinian Supergene Karsts in the Qaidam Basin,NW China:Evidence from Paleo-tectonics,Paleoclimates and Paleo-fluids显示文摘In the Qaidam basin,Northwest China,karstic fissures and caves are developed in many places of the Lower Carboniferous Chengqianggou Fm.and Huaitoutala Fm.and the Upper Carboniferous Keluke Fm.,in which are found typical karstic marks.Several suites of transgressive carbonate rocks formed during the Late Paleozoic epoch are preserved as reservoir properties in the Qaidam basin,with paleokarst-related cave-fractured diagenetic structures,which provided the basis for cavefractured development.Carbonate and clastic samples covering or infilling caves and fractures in Carboniferous strata were collected in the eastern Qaidam basin to focus on petrological and geochemical analyses of karst and infilling materials.Based on this study of the Caledonian diagenetic sequence,and bitumen-infilled inclusion temperature and burial history,there existed a continuous atmospheric freshwater leaching process,which played a critical role in the construction of the Carboniferous supergene paleokarsts.Investigation and survey of the tectonic setting,plate paleolatitude and river development intensity also proves that there was abundant rainfall during the Indosinian period,after which the strata undergo a shallow burial process.Because Indosinian period is earlier than the key timing of hydrocarbon-generation of the Carboniferous source rocks,this kind of karst reservoir has potential significance for oil-gas resources in this area. | LI Zongxing PENG Bo QI Kening LIU Dapeng MA Yinsheng ZHANG Wang HU Junjie WANG Jiaqi | 2022 | Acta Geologica Sinica(English Edition)2022，96，1： | 0 |
| 5 | 川中地区震旦系“葡萄花边”白云岩的形成时代与成因显示文摘四川盆地震旦系灯影组是重要的油气勘探开发层系,复杂的成岩演化和多期流体活动导致多种类型的白云岩形成。揭示震旦系白云岩的形成时代和成因不仅可以为四川盆地震旦系下一步的油气勘探提供更加充实的科学依据,也可为理解全球大规模存在前寒武纪白云岩的原因提供有益启示。本文针对川中地区震旦系灯影组“葡萄花边”白云岩的形成时代和成因进行了综合研究。岩相学研究表明,“葡萄花边”白云岩充填于藻白云岩的孔隙内,向内对称生长,结晶程度明显好于藻白云岩。在岩相学的基础上,利用激光剥蚀-电感耦合等离子体质谱(LA-ICP-MS)微区原位U-Pb定年确定其形成时代,研究结果表明:川中地区震旦系灯影组“葡萄花边”白云岩形成时代为530±12Ma~502±12Ma,略新于灯影组地层年代。结合微量元素分析以及碳-氧-锶同位素数据,对川中地区震旦系灯影组“葡萄花边”白云岩进行成因分析。结果表明,其稀土元素总量(∑REE)相对较低(0.680×10^(-6)~8.963×10^(-6)),δ13 C VPDB(-0.1‰~1.7‰)略低于与同时期海水沉积白云岩的碳同位素值,δ18 O VPDB(-2.3‰~1.4‰)略高于与同时期海水达到氧同位素平衡的白云岩氧同位素值,87 Sr/86 Sr值(0.70876~0.70909)基本落入同时期海水范围。稀土元素配分总体为水平的模式,所有样品表现出Ce负异常。表明其形成环境既非海水沉积环境,也不完全是表生大气水岩溶条件。综合上述特征,推断川中地区震旦系灯影组“葡萄花边”白云岩是在震旦纪末-寒武纪早期海平面高频低幅度波动这一背景下,灯影组地层多次暴露与淹没,形成岩溶裂缝和孔洞的同时在溶蚀空间内结晶形成。残留孔洞为其后流体活动、油气充注提供了储集空间。本研究为认识川中地区震旦系灯影组“葡萄花边”白云岩成因、震旦纪末-寒武纪早期水化学条件、及超深层油气勘探开发提供了有益参考。 | 倪智勇 赵建新 俸月星 周玮 杨程宇 刘汇川 邵钢钢 罗冰 | 2024 | 岩石学报2024，40，1： | 0 |
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