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涠西南凹陷涠洲组西南部断块油藏成藏特征 被引量:1

Reservoir forming characteristics of fault block reservoir in the southwest of Weizhou Formation in Weixinan Sag
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摘要 涠西南凹陷涠洲组油气产能集中在东部,西南部产能建设进展缓慢。为揭示涠洲组西南部成藏特征,通过地层演化过程和成藏主控因素分析,结合圈闭钻探成果进行验证,对涠洲组西南部成藏模式与特征进行研究。流二段烃源岩微量元素Sr/Ba平均值为0.27、V/(V+Ni)平均值为0.74,碳硫含量呈正相关性,证实流二段烃源岩形成环境具有更强的还原性,是涠洲组油气最主要的来源。涠洲组构造圈闭定型早于流二段第2次大规模生烃期,时间配置良好;涠洲组发育反向正断层,砂岩与泥岩对接形成屋脊构造,断层封堵性能分析定量确定了含油圈闭的指标特征,空间配置优越。油气通过由断层、不整合面与渗透性砂体联合构成的立体输导体系,呈总体向上“T”形运移,形成断块油藏,涠洲组良好的时空配置关系是断块圈闭有效性的关键因素。 The production capacity of Weizhou Formation in Weixinan Sag is concentrated in the East,and the production capacity construction in the southwest is progressing slowly.In order to reveal the reservoir forming characteristics in the southwest of Weizhou Formation,the reservoir forming model and characteristics in the southwest of Weizhou Formation are studied through the analysis of stratigraphic evolution process,main controlling factors of reservoir forming and the verification of trap drilling results.It is found that the average values of Sr/Ba and V/(V+Ni)of trace elements in the source rocks of the second member of Liushagang Formation are 0.27 and 0.74,the carbon and sulfur content is positively correlated.It is confirmed that the source rock in the second member of Liushagang Formation has stronger reducibility and is the main source of oil and gas in Weizhou Formation.The structural trap of Weizhou Formation was established earlier than the second large-scale hydrocarbon generation stage of the second member of Liushagang Formation with good time configuration.The reverse normal fault is developed in Weizhou Formation,and the roof structure is formed by the butt joint of sandstone and mudstone.The fault sealing performance analysis quantitatively determines the index characteristics of oil-bearing traps,with superior spatial configuration.Oil and gas through the three-dimensional transport system are composed of fault,unconformity and permeable sand body,migrate in an overall upward“T”shape and form a fault block reservoir.The good temporal and spatial allocation relationship of Weizhou Formation is the key factor for the effectiveness of fault block trap.
作者 刘文峰 LIU Wen-feng(Sinopec Geophysical Corporation Ltd.,Nanjing 211112,China)
出处 《桂林理工大学学报》 CAS 北大核心 2022年第3期557-564,共8页 Journal of Guilin University of Technology
基金 国家科技重大专项(2016ZX05024) 中国石化科技项目(P14088)。
关键词 涠洲组 成藏主控因素 时空配置 成藏模式 涠西南凹陷 北部湾盆地 Weizhou Formation main controlling factors of accumulation space-time configuration accumulation model Weixinan Sag Beibuwan Basin
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