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Sedimentary Characteristics and Formation Mechanisms of Lacustrine Beach-Bars in the Fourth Member of the Shahejie Formation in the Shubei Area, Western Depression of the liaohe oilfield, China

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Journal of Earth Science 2017年第6期28卷 1178-1190页

作者： Yi Gao Xiaolong Jiang Fang Liu Xuying Wang Ruohan Liu School of Energy Resources China University of Geosciences Beoing 100083 China Institute of Earth Sciences China University of Geosciences Beijing 100083 China School of Earth and Mineral Sciences The Pennsylvania State University 201 Old Main University Park PA 16802 United States Star Wisdom Technology Co. Ltd. Beijing 102200 China

Beach-bars are well developed in the fourth member of the Shahejie Formation in the Shubei area, western depression of the liaohe oilfield. The fourth member is composed of two three-order sequences, including a lower Sequence 1（SQ1） and an upper Sequence 2（SQ2）. SQ2, which is the focus of this study, comprises a lowstand systems tract（LST） and a transgressive system tract（TST）. Three types of beach-bars have been recognized： shallow-littoral lacustrine sandy beach-bars, semi-deep lacustrine storm-related sandy beach-bars and shallow-littoral lacustrine carbonate beach-bars. Paleo-environments during the deposition of SQ2, including the paleo-geomorphology, paleo-water depth and paleo-source have been reconstructed to determine the formation mechanisms of the different types of beach-bars. The shallow-littoral lacustrine sandy beach-bars formed mainly by waves and currents and were mostly deposited in the LST, where water depths ranged from 3 to 9 m and the terrestrial clast supply is sufficient. The storm-related sandy beach-bars developed in the TST in the southern part of the study area near previously massively deposited sand bodies where there was sufficient water depth to preserve them. The carbonate beach-bars formed primarily in the TST in the Shubei low buried hill belt where there was a lack of terrestrial clast supply and complex, uneven geomorphology that easily gave rise to a lagoonal environment.

关键词： beach-bars Shubei area sedimentary characteristics formation mechanisms western depression liaohe oilfield

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Distribution and treatment of harmful gas from heavy oil production in the liaohe oilfield, Northeast China

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Petroleum Science 2010年第3期7卷 422-427页

作者： Zhu Guangyou Zhang Shuichang Liu Qicheng Zhang Jingyan YangJunyin Wu Tuo Huang Yi Meng Shucui Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China State Key Laboratory of Enhanced Oil Recovery Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China Research Institute of Exploration and Development PetroChina Liaohe Oilfield Company Panjin Liaoning 124010 China

The distribution and treatment of harmful gas （H2S） in the liaohe oilfield, Northeast China, were investigated in this study. It was found that abundant toxic gas （H2S） is generated in thermal recovery of heavy oil. The H2S gas is mainly formed during thermochemical sulfate reduction （TSR） occurring in oil reservoirs or the thermal decomposition of sulfocompounds （TDS） in crude oil. H2S generation is controlled by thermal recovery time, temperature and the injected chemical compounds. The quantity of SO4^2- in the injected compounds is the most influencing factor for the rate of TSR reaction. Therefore, for prevention of H2S formation, periodic and effective monitoring should be undertaken and adequate H2S absorbent should also be provided during thermal recovery of heavy oil. The result suggests that great efforts should be made to reduce the SO4^2- source in heavy oil recovery, so as to restrain H2S generation in reservoirs. In situ burning or desulfurizer adsorption are suggested to reduce H2S levels. Prediction and prevention of H2S are important in heavy oil production. This will minimize environmental and human health risks, as well as equipment corrosion.

关键词： Toxic gas H2S heavy oil production TSR liaohe oilfield

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