CHARACTERISTICS OF SOURCE ROCKS AND EXPLORATION POTENTIAL IN THE NORTHERN SAG OF MIAOXI, BOHAI SEA
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摘要:
利用最新的三维地震、钻井、测井、烃源岩和原油分析化验等资料，对庙西北洼烃源岩地球化学指标、分布特征及成因环境进行了分析，借助盆地模拟和油源对比结果，明确了庙西北洼的主力烃源岩层系和勘探潜力。研究认为：庙西北洼发育东营组和沙一二段2套烃源岩，其中沙一二段烃源岩有机质类型好、丰度高、有机质成熟度高，为好—很好烃源岩，其排烃量占洼陷总排烃量的56%，是庙西北洼的主力烃源岩。油源对比结果表明，PL15-2亿吨级大油田的原油来自沙一二段烃源岩，进一步佐证了沙一二段为主力烃源岩，也预示了庙西北洼具有良好的勘探潜力。
Abstract:Hydrocarbon source rocks in the Northern Sag of Miaoxi of the Bohai Sea are studied based on the latest 3D seismic, drilling, logging, hydrocarbon source rocks and oil testing data for revealing their geochemical parameters, distribution patterns and forming environment. Basin simulation and mixed oil contribution analysis technique have been adopted for evaluation of main hydrocarbon source rocks and their exploration potentials. Results show that there are two sets of source rocks in the Northern Sag of Miaoxi, called Ed and Es12 respectively. The source rock Es12, which contains high abundance of matured organic matter of good type, is the major source rock in the Sag, of which the amount of hydrocarbon expulsion accounts for 56% of the total. Oil-source correlation further suggests that the crude oil of PL15-2 oilfield is mainly derived from the source rocks Es12. More data indicate that the Northern Sag of Miaoxi has a great exploration potential of hydrocarbons.
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表 1 庙西北洼烃源岩地化参数
Table 1. Geochemical characteristics of source rocks in the Northern Sag of Miaoxi
层段 TOC/% S1+S2/(mg/g) 总烃/(μg/g) 氯仿沥青“A” /% HI/(mg HC /g TOC) 东营组 0.84~2.83 2.09~28.52 146.58~6 009.12 0.027 6~0.770 4 179.77~565.65 1.86(55) 9.96(59) 2 704.4(26) 0.408 7(32) 394.31(55) 沙一二段 1.23~2.46 4.67~12.13 1 263.53~3 737.65 0.188 7~0.506 8 217.05~483.53 1.90(10) 7.95(10) 2 205.92(5) 0.316 6(6) 310.69(10) 注：表中“0.84～2.83”表示“最小值~最大值”；“1.86(55)”表示“平均值(样品个数)” 
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