孟金落,康洪全,贾怀存,等. 埃斯皮里图桑托盆地盐上油气成藏特征及主控因素分析[J]. 海洋地质前沿,2022,38(7):48-56. DOI: 10.16028/j.1009-2722.2021.117
    引用本文: 孟金落,康洪全,贾怀存,等. 埃斯皮里图桑托盆地盐上油气成藏特征及主控因素分析[J]. 海洋地质前沿,2022,38(7):48-56. DOI: 10.16028/j.1009-2722.2021.117
    MENG Jinluo, KANG Hongquan, JIA Huaicun, et al. Characteristics and main controlling factors of post-salt hydrocarbon accumulation in Espirito Santo Basin, Brazil[J]. Marine Geology Frontiers, 2022, 38(7): 48-56. DOI: 10.16028/j.1009-2722.2021.117
    Citation: MENG Jinluo, KANG Hongquan, JIA Huaicun, et al. Characteristics and main controlling factors of post-salt hydrocarbon accumulation in Espirito Santo Basin, Brazil[J]. Marine Geology Frontiers, 2022, 38(7): 48-56. DOI: 10.16028/j.1009-2722.2021.117

    埃斯皮里图桑托盆地盐上油气成藏特征及主控因素分析

    Characteristics and main controlling factors of post-salt hydrocarbon accumulation in Espirito Santo Basin, Brazil

    • 摘要: 大坎波斯盆地是世界深水沉积勘探的热点盆地,但针对其北段的埃斯皮里图桑脱盆地盐上油气富集规律的系统研究尚未展开。为进一步指导埃斯皮里图桑脱盆地盐上的油气勘探,综合利用钻井、测井和地震资料,对该盆地的油气成藏特征和主控因素进行了综合分析。研究表明:①埃斯皮里图桑托盆地发育盐下湖相和盐上海相2套烃源岩,且储层主要为盆地北部上白垩统—新近系深水水道砂岩;②依据盐岩层滑脱变形的构造特征,可将盐上构造格局划分为盐滑脱带、盐底辟带和盐推覆带;③盐滑脱带成藏模式表现为盐下和盐上烃源岩生成的油气分别通过盐窗和盐相关断裂运移,最终在盐滑脱形成的滚动背斜等圈闭中成藏;④盐底辟带成藏模式表现为盐上烃源岩生成的油气通过盐相关断裂运移,最终在盐底辟相关背斜和盐侧翼遮挡的圈闭中成藏;⑤储层、盐相关铲式断层和盐岩活动是油气成藏的主控因素。

       

      Abstract: The Campos Basin in Brazil is well-known of deep-water sedimentary exploration in the world. However, no systematic study has been carried out on the post-salt hydrocarbon accumulation in the Espirito Santo Basin (ESB) in the northern part of the Campos Basin. To advance the post-salt oil and gas exploration, the characteristics of oil-gas accumulation and the main controlling factors in the ESB were scrutinized using drilling, logging, and seismic profiling. Results bring up the following 4 conclusions: ① Two sets of source rocks including pre-salt lacustrine and post-salt marine source rocks are developed. The reservoir is mainly composed of the Upper Cretaceous to Tertiary deepwater channel sandstone in the north of the basin. ② According to the detachment deformation of salt rock, post-salt formation can be divided into detachment zone, diapir zone, and nappe zone. ③ The hydrocarbon accumulation model of salt detachment zone shows that the hydrocarbon generated by pre-salt and post-salt source rocks migrate through salt windows and salt related faults, respectively, and finally form reservoirs in rolling anticlines and other traps formed by salt detachment. ④ The hydrocarbon accumulation model of salt diapir zone is that hydrocarbon generated by post-salt source rocks migrate through salt-related faults, and finally accumulated in anticlines related with salt diapers and other traps blocked by salt flank. ⑤ Reservoir- and salt-related listric faults, and activities of salt-bearing rocks are the main controlling factors of hydrocarbon accumulation in the ESB.

       

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