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Depositional Architecture of Eocene and Cretaceous Reservoirs (Blending Seismic and Well Data) in Mubarik Area, Central Indus Basin, Pakistan
Pure and Applied Geophysics ( IF 1.9 ) Pub Date : 2021-04-06 , DOI: 10.1007/s00024-021-02715-0
Masab Toosy , Sarfraz Khan , Urooj Shakir , Umair Bin Nisar , Kaleem Ullah , Anwar Qadir , Maas Siddique

Structural and stratigraphic geometries in the Central Indus Basin of Pakistan are subjects of interest for explorers. The thickening and thinning sequences in conjunction with structural anomalies often provide an environment for hydrocarbon accumulation. Hydrocarbons play a vital role in the energy mix of Pakistan. With the help of well correlation, work on seismicity can be confirmed by marking terminations, depositional extent and thickness variation at different stratigraphic levels. Therefore, this work presents depositional geometries of Eocene and Cretaceous reservoirs [Sui Main Limestone (SML) and B-sand interval of Lower Goru Formation], keeping in view the vertical and lateral resolution of the seismic data and the distance between the wells for correlation. The Eocene SML and Cretaceous B-sand are extensively mapped as isochrones using 20 seismic lines and correlated with ten wells. The results give evidence of a building up of shallow marine shelf carbonate in Eocene SML. The isochrone maps also indicate that Eocene SML has untapped potential east of the study area. The Cretaceous B-sand demonstrates sheet-like geometry of sand-filled delta progrades in the west to southwest direction in a ramp setting. This geometry suggests an updip hydrocarbon potential in Cretaceous B-sand reservoir in the north of the study area. Because of the pinching out behavior and excellent stratigraphic trapping system, these two reservoirs can be considered future exploration targets.



中文翻译:

巴基斯坦中部印度河流域穆巴里克地区始新世和白垩纪储层(混合地震数据和井数据)的沉积构造

巴基斯坦中部印度河流域的结构和地层几何特征是勘探者感兴趣的主题。增厚和稀疏序列与结构异常一起经常为油气聚集提供环境。碳氢化合物在巴基斯坦的能源结构中起着至关重要的作用。借助良好的相关性,可以通过在不同地层水平上标出终点,沉积程度和厚度变化来确认地震活动。因此,这项工作提出了始新世和白垩纪储层的沉积几何特征[隋主石灰岩(SML)和下古鲁组的B砂层段],同时考虑了地震数据的垂直和横向分辨率以及井间距离的相关性。 。始新世SML和白垩纪B砂被广泛地映射为等时线,使用20条地震线,并与10口井相关。结果提供了始新世SML中浅海陆架碳酸盐堆积的证据。等时线图还表明,始新世SML在研究区域以东尚未挖掘潜力。白垩纪的B砂在斜坡环境中表现出片状的充满沙子的三角洲,从西向西南方向发展。这种几何形状表明研究区北部的白垩纪B砂储层有向上倾的碳氢化合物潜力。由于具有突出的作用和出色的地层圈闭系统,这两个油藏可以被视为未来的勘探目标。结果提供了始新世SML中浅海陆架碳酸盐堆积的证据。等时线图还表明,始新世SML在研究区域以东尚未挖掘潜力。白垩纪的B砂在斜坡环境中表现出片状的充满沙子的三角洲,从西向西南方向发展。这种几何形状表明研究区北部的白垩纪B砂储层有向上倾的碳氢化合物潜力。由于具有突出的作用和出色的地层圈闭系统,这两个油藏可以被视为未来的勘探目标。结果提供了始新世SML中浅海陆架碳酸盐堆积的证据。等时线图还表明,始新世SML在研究区域以东尚未挖掘潜力。白垩纪的B砂在斜坡环境中表现出片状的充满沙子的三角洲,从西向西南方向发展。这种几何形状表明研究区北部的白垩纪B砂储层有向上倾的碳氢化合物潜力。由于具有突出的作用和出色的地层圈闭系统,这两个油藏可以被视为未来的勘探目标。这种几何形状表明研究区北部的白垩纪B砂储层有向上倾的碳氢化合物潜力。由于具有突出的作用和出色的地层圈闭系统,这两个油藏可以被视为未来的勘探目标。这种几何形状表明研究区北部的白垩纪B砂储层有向上倾的碳氢化合物潜力。由于具有突出的作用和出色的地层圈闭系统,这两个油藏可以被视为未来的勘探目标。

更新日期:2021-04-06
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