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Coupled carbon and sulfur isotope behaviors and other geochemical perspectives into marine methane seepage

Acta Oceanologica Sinica 2017年第6期36卷 12-22页

作者： LIU Lihua FU Shaoying ZHANG Mei GUAN Hongxiang WU Nengyou Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangzhou Marine Geological Survey Guangzhou 510760China The Key Laboratory of Gas Hydrate of Ministry of Land and Resources Qingdao Institute of Marine GeologyQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

Methane seepage is the signal of the deep hydrocarbon reservoir. The determination of seepage is significant to the exploration of petroleum, gas and gas hydrate. The seepage habits microbial and macrofaunal life which is fueled by the hydrocarbons, the metabolic byproducts facilitate the precipitation of authigenic minerals. The study of methane seepage is also important to understand the oceanographic condition and local ecosystem. The seepage could be active or quiescent at different times. The geophysical surveys and the geochemical determinations reveal the existence of seepage. Among these methods, only geochemical determination could expose message of the dormant seepages. The active seepage demonstrates high porewater methane concentration with rapid SO42- depleted, low HaS and dissolved inorganic carbon （DIC）, higher rates of sulfate reduction （SR） and anaerobic oxidation of methane （AOM）. The quiescent seepage typically develops authigenic carbonates with specific biomarkers, with extremely depleted 13C in gas, DIC and carbonates and with enriched 34S sulfate and depleted 34S pyrite. The origin of methane, minerals precipitation, the scenario of seepage and the possible method of immigration could be determined by the integration of solutes concentration, mineral composition and isotopic fractionation of carbon, sulfur. Numerical models with the integrated results provide useful insight into the nature and intensity of methane seepage occurring in the sediment and paleo- oceanographic conditions. Unfortunately, the intensive investigation of a specific area with dormant seep is still limit. Most seepage and modeling studies are site-specific and little attempt has been made to extrapolate the results to larger scales. Further research is thus needed to foster our understanding of the methane seepage.

关键词： marine seepage authigenic minerals carbon isotopes sulfur isotopes numerical simulation

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Bitumen formation of Cambrian Longwangmiao Formation in the central Sichuan and its implication for hydrocarbon accumulation

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Petroleum Research 2018年第1期3卷 44-56页

作者： Bin Hao Wenzhi Zhao Suyun Hu Shuyuan Shi Ping Gao Tongshan Wang Shipeng Huang Hua Jiang Northwest Branch PetroChina Research Institute of Petroleum Exploration and DevelopmentGansu 730020China PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China Sinopec Petroleum Exploration and Production Research Institute Beijing 100083China

Based on organic petrology,organic geochemistry and SEM method,type,formation period and source of bitumens in the Cambrian Longwangmiao Formation in the central Sichuan Basin were well investigated,and combined with fluid inclusions and tectonic evolution characteristics,the hydrocarbon accumulation history of the gas reservoir of the Longwangmiao Formation in the Anyue gasfield was also *** result shows that all bitumens in the Longwangmiao Formation was from the Lower Cambrian source rocks,it had multiple genetic types which was dominated by the pyrolysis genetic type;the bitumens were formed into three stages,i.e.,the bitumen of the oxidized water-washing type in the first stage,the bitumen of the precipitated type in the second stage,and the bitumen of the pyrolyzed type in the third stage;the gas reservoir in the Anyue gasfield experienced five stages of hydrocarbon charging,including two stages of liquid hydrocarbon charging,charging of the kerogen pyrolysis gas in the Late Triassic-Early Jurassic,charging of the crude oil pyrolysis gas in the Late Jurassic-Early Cretaceous and charging of the dry gas charging in the Himalayan trap reformation and adjustment process.

关键词： Bitumen Biomarker authigenic minerals Inclusion Hydrocarbon charging Longwangmiao Formation Central Sichuan

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