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首页> 外文期刊>Arabian Journal for Science and Engineering >Comparative Study of Pore Pressure in Wells of Indus Offshore, Southwest Pakistan
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Comparative Study of Pore Pressure in Wells of Indus Offshore, Southwest Pakistan

机译：巴基斯坦西南印度河近海井孔压比较研究

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摘要

Hydrocarbon exploration in frontier areas or offshore requires significant considerations regarding drilling and engineering for the purpose of lowering cost without compromising safety and the environment, and managing the risk associated with very expensive drilling operations. Clastics strata encountered in the wells drilled in the Offshore Indus Basin of Pakistan (Indus Marine-1A, Indus Marine-1C) are characterized by the development of abnormal formation pressures. In this study, an estimation of abnormal pressures using offshore well data is carried out, using Eaton's resistivity model, to obtain better pressure estimates. The study uses well log data to derive the overburden gradient (OBGrad), pore pressure gradient (PPG), and fracture gradients (FGs) in studied wells, based on Eaton's resistivity model. The gradient and pressure cross-plots generated for these wells show the relationship of pressure with increasing depth. The study concludes that Indus Marine-1C is characterized by a higher over pressure than Pak Can-01 and Indus Marine-1A. Findings from the study confirm that the Indus Marine-1C shows high FG, while in Pak Can-01 and Indus Marine-1A, the FG is below the maximum limit. The study concludes that rapid burial and high rates of sedimentation during the Miocene Epoch (23.03-5.3 million years ago) have led to the development of overpressure by disequilibrium compaction.
机译：为了降低成本而不损害安全性和环境，并管理与非常昂贵的钻井作业相关的风险，在边境地区或近海进行碳氢化合物勘探需要对钻井和工程进行大量考虑。在巴基斯坦近海印度河盆地（Indus Marine-1A，Indus Marine-1C）钻井中遇到的碎屑岩层的特征是异常地层压力的发展。在这项研究中，使用伊顿的电阻率模型，利用海上钻井数据对异常压力进行了估算，以获得更好的压力估算。该研究基于伊顿的电阻率模型，利用测井数据导出研究井中的上覆梯度（OBGrad），孔隙压力梯度（PPG）和裂缝梯度（FGs）。这些井产生的梯度和压力交会图显示了压力与深度之间的关系。研究得出的结论是，Indus Marine-1C具有比Pak Can-01和Indus Marine-1A更高的过压特征。该研究的结果证实，印度洋Marine-1C的FG较高，而在Pak Can-01和印度洋Marine-1A中，FG低于最大限值。研究得出的结论是，中新世时期（23.03-530万年前）的快速埋葬和高沉积率导致了不平衡压实的超压发展。

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