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《Science & Technology Review》 2010-06
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Characteristics of Source Kitchen and Hydrocarbon Generation in Banqiao Sag, Bohaiwan Basin

CHEN Jingyi, WANG Feiyu State Key Laboratory of Petroleum Resource and Prospecting;Faculty of Natural Resource and Information Technology, China Petroleum University, Beijing 102249, China  
Banqiao sag is the most exceptional feature of the Mesozoic and Cenozoic lacustrine basins in eastern China.Gas to Oil Ratio(GOR) of the present reservoirs ranges from 300m3/t to 3000m3/t, with most of reservoirs saturated or supersaturated with gas.Based on rock-Eval data and logging data, source kitchen characteristics were evaluated.Effective source rocks chiefly lie in the first and the third members of Shahejie formation, which are of types II2-Ⅲ.Total organic carbonranges from 1% to 2%, which corresponds to Hydrocarbon Index(HI) of from 200mg/g to 350 mg/g.The mature depth of the source rock is below 3600~3800m.Consequently, characteristics and components of the hydrocarbon generation and expulsion can be calculated.Significant hydrocarbon expulsion begins when the transformation rate is about 30% and vitrinite reflectance is more than 0.8%.GORs of the hydrocarbon expulsion from the first and the third members of Shahejie formation are over 600m3/t and 222m3/t, respectively, which is highly consistent with the property of the present reservoirs.The analyses of more regions in eastern China show that the initial hydrogen index(HIo) and the initial total organic carbon are key factors to control GOR of reservoirs.Most of gases trapped in Banqiao sag are attributed to the humic source rock.
【CateGory Index】: P618.13
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