The Glutenite Sedimentary Facies and Hydrocarbon Distribution in the Upper Fourth Member of Shahejie Formation in Shengtuo Area
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摘要: 摘 要 胜坨地区沙四上亚段发育了以砂砾岩扇体为主的沉积体系，在深水区存在各种浊积砂砾岩体。本文在岩心观察和描述的基础上,结合测井等资料，对胜坨地区沙四上亚段砂砾岩体的沉积特征进行了研究，并分析了其油气分布特征。结果表明胜坨地区沙四上亚段在同生断层的下降盘主要发育水进型扇三角洲沉积体系，同时还广泛发育了重力流水道和滑塌浊积扇等浊积砂砾岩体。该区各类砂砾岩油藏在平面上由洼陷中心向边缘相带依次分布岩性油气藏—构造油气藏—地层油气藏，油气分布明显受沉积相控制，不同的相带储层物性差异明显。扇三角洲扇中部位储集物性较好，为油气聚集有利相带；滑塌浊积扇和重力流水道等浊积岩体次之；扇三角洲扇根、扇端则因储集物性较差，含油气性较差。此外，继承性深洼陷与岩性的分区性对油气分布有较大的影响。Abstract: Abstract Glutenite fans are the major sedimentary systems in the upper fourth member of Shahejie formation in Shengtuo area, and different turbiditic glutenites develop in the deep lacustrine environment. On the base of cores observation and description, combined with the numerous data of well logging, sedimentary characteristics are studied in the upper fourth member of Shahejie formation in Shengtuo area, and the hydrocarbon distribution is analysed. The results show that the prograded-type fan delta is the major sedimentary system in the downdropped block of contemporaneous fault in Shengtuo area. The gravity channel and slump develop simultaneously. The glutenite reservoirs successively distribute lithologic hydrocarbon reservoir,structural hydrocarbon reservoir,stratigraphic hydrocarbon reservoir from the central subsag to the marginal facies belt. The hydrocarbon distribution is controlled by sedimentary facies apparently. The variance of reservoir quality is obviously in different facies belt. The reservoir quality is the best in middle fans, and they are the favorable places for hydrocarbon accumulation. The slumps and gravity channels take second place. The oiliness quality of inner fans and outer fans are bad because of bad reservoir quality. In addition, the inherited deep subsag and the partition of lithology have effects on hydrocarbon distribution.
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