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首页> 外文期刊>Petroleum Geoscience >Geology and petroleum prospectivity of the Larne and Portpatrick basins, North Channel, offshore SW Scotland and Northern Ireland
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Geology and petroleum prospectivity of the Larne and Portpatrick basins, North Channel, offshore SW Scotland and Northern Ireland

机译：Larne和Portpatrick Basins，北京，海上SW苏格兰和北爱尔兰的地质和石油前景

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摘要

The Larne and Portpatrick basins, located in the North Channel between SW Scotland and Northern Ireland, have been the target of a small programme of petroleum exploration activities since 1971. A total of five hydrocarbon exploration wells have been drilled within the two basins, although as of yet no commercial discoveries have been made. The presence of hydrocarbon shows alongside the discovery of two good-quality reservoir-seal couplets within Triassic and underlying Permian strata has encouraged exploration within the region. The focus of this study is to evaluate the geology and hydrocarbon pro spectivity of the Portpatrick Basin and the offshore section of the Lame Basin. This is achieved through the use of seismic reflection data, and gravity and aeromagnetic data, alongside sedimentological, petrophysical and additional available datasets from both onshore and offshore wells, boreholes and previously published studies. The primary reservoir interval, the Lower-Middle Triassic Sherwood Sandstone Group (c. 600-900 m gross thickness), is distributed across both basins and shows good to excellent porosity (10-25%) and permeability (10-1000 mD) within the Larne Basin. The Middle-Late Triassic Mercia Mudstone Group should provide an excellent top seal where present due to the presence of thick regionally extensive halite deposits, although differential erosion has removed this seal from the margins of the Larne and Portpatrick basins. The Carboniferous, which has been postulated to contain organic-rich source-rock horizons, as inferred from their presence in adjacent basins, has not yet been penetrated within the depocentre of either basin. There is, therefore, some degree of uncertainty regarding the quality and distribution of a potential source rock. The interpretation of seismic reflection profiles presented here, alongside the occurrence of hydrocarbon shows, indicates the presence of organic-rich pre-Permian sedimentary rocks within both basins. 1D petroleum system modelling of the Larne-2 borehole shows that the timing of hydrocarbon generation and migration within the basins is a significant risk, with many traps post-dating the primary hydrocarbon charge. Well-failure analysis has revealed that trap breach associated with kilometrescale uplift events, and the drilling of wells off-structure due to a lack of good-quality subsurface data, have contributed to the lack of discoveries. While the Larne and Portpatrick basins have many elements required for a working petroleum system, along with supporting hydrocarbon shows, the high risks coupled with the small scale of potential discoveries makes the Portpatrick Basin and offshore section of the Larne Basin poorly prospective for oil and gas discovery.
机译：Larne和Portpatrick Basins位于SW苏格兰和北爱尔兰北部渠道，自1971年以来一直是石油勘探活动小组计划的目标。在两个盆地内共钻了五大的碳氢化合物勘探井，尽管如此但没有商业发现。碳氢化合物的存在与在三叠系和潜在的二叠系地层中的两个高质量的储层密封对联的发现相信该地区的探索。本研究的重点是评估Portpatrick盆地和跛脚盆地的海上部分的地质和碳氢化合物PRO。这是通过使用地震反射数据和重力和航空磁性数据来实现的，以及来自陆上和近海井，博孔和先前发表的研究的沉积学，剥落和额外的数据集。初级储层间隔，中间三叠系舍伍德砂岩组（粗厚度为600-900米厚度），分布在两个盆地上，表现出优异的孔隙率（10-25％）和渗透率（10-1000 md） Larne盆地。中期三叠系Mercia Mudia Group应提供优异的顶部密封，其中由于存在厚的区域广泛的宿舍沉积物，尽管差动侵蚀已从Larne和Portpatrick盆地的边缘中取出了这种密封。已经假定的石炭系含有有机物富源岩体视野，从其在相邻盆地的存在中推断，尚未在任何一个盆地的困境中被渗透。因此，有一定程度的不确定性关于潜在源岩的质量和分布。在这里呈现的地震反射谱的解释以及烃展的发生以及两种盆地内的有机丰富的预二叠女沉积岩存在。 1D Larne-2钻孔的石油系统建模表明，盆地内的碳氢化合物产生和迁移的时序是一种重要的风险，许多陷阱与初级烃电荷进行后追溯。故障良好分析透露，由于缺乏高质量的地下数据，井下升起事件的陷阱泄露以及井下结构的钻探，这促成了缺乏发现。虽然Larne和Portpatrick盆地有许多工作石油系统所需的元素，以及支持的碳氢化合物表演，但高风险加上小规模的潜在发现使得Portpatrick盆地和Larne盆地的近海部分对石油和天然气的潜在需求不佳发现。

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  • 来源
    《Petroleum Geoscience》 |2020年第2期|共31页
  • 作者

    Fyfe Laura-Jane C.; Schofield Nick; Holford Simon P.; Heafford Adrian; Raine Rob;

  • 作者单位

    Univ Aberdeen Kings Coll Dept Geol &

    Petr Geol Aberdeen AB24 3FX Scotland;

    Univ Aberdeen Kings Coll Dept Geol &

    Petr Geol Aberdeen AB24 3FX Scotland;

    Univ Adelaide Australian Sch Petr Santos Petr Engn Bldg Adelaide SA 5005 Australia;

    IHS Markit Int Subsurface Informat 25 Ropemaker St London EC2Y 9LY England;

    Geol Survey Northern Ireland GSNI Dundonald House Upper Newtownards Rd Belfast BT4 3SB Antrim North Ireland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 石油、天然气工业;
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