数据有限勘探区钻前孔隙压力综合预测方法——以缅甸近海为例

A. Sakulraungsri, P. Boonyasatphan, K. Rungsai, S. Sa-nguanphon, P. Som-in, Vitoon Chaisomboonpan, H. Sognnes, J. Iamboon
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引用次数: 0

摘要

缅甸摩阿塔玛湾盆地基底高区地质环境复杂。区内构造地层背景发生显著变化,导致烃源岩沉积和热成熟程度不同,导致地下孔隙压力变化剧烈,机制不确定。尽管探井的可钻性在很大程度上取决于精确的孔隙压力预测,但由于缺乏原始数据集,这种压力的估计存在问题。为了保证可靠性,本文采用综合方法对钻前孔隙压力和裂缝梯度进行了评估。在模型构建过程中,考虑了宽带地震、井眼地球物理数据、三维热流模型和盆地历史分析的层间速度。此外,为了处理这种复杂的地质环境下的预测,综合地质解释已经证明了对输出的验证和量化不确定性的合理范围的有用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Integrated Approach for Pre-drill Pore Pressure Prediction in Data-limited Exploration Area—A Case Study from Offshore Myanmar
Summary In Basement-high Area, Gulf of Moattama Basin, Myanmar, the geological setting is complex. A significant change in tectonostratigraphy setting across the area leads to different sedimentation and thermal maturation of the source rock, thereby highly variable subsurface pore pressure with undetermined mechanism occurred. Even though drillability of exploration wells depends crucially on a precise pore pressure prediction, the estimation of such pressure is problematic due to the lack of primary dataset. To ensure reliability, the assessment of pre-drill pore pressure and fracture gradient illustrated herein is performed by an integrated approach. Interval velocity from broadband seismic, borehole geophysical dataset, 3-D heat-flow model, and basin history analysis were taken into account during the course of the model construction. Additionally, to handle the prediction in this complicated geology setting, comprehensive geological interpretation was included and has shown the usefulness for validating the output and quantifying the sensible range of uncertainty.
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