渤海湾海上油田复杂碎屑岩储层地质建模技术创新与实践

Xiaoming Ye, Chunliang Huo, Pengfei Wang, Zhennan Gao, Jing Xu, Y. Mao, Xinlei Shi
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引用次数: 0

摘要

渤海油田位于渤海湾,主要为复杂碎屑岩储层。由于地震分辨率低,储层预测十分困难,特别是在深层油田。此外,如何定量表征新油田开发的风险,如何在油田开发后期建立更精细的模型,是一个特别具有挑战性的问题。本文提出了一种创新的海上油田复杂碎屑岩储层表征工作流程。提出了一种基于沉积演化模拟的深层油田建模方法,该方法可以提供建模约束。通过沉积演化建模等信息,分析储层和构造的不确定性,通过实验设计、地质建模和流线模拟评价储量规模和储层连通性;最后选择3p模型。提出了一种用较少网格量建立老油田精细模型的新方法。在数值模拟模型中,由于没有对配置单元进行实际建模,一些小型配置单元引起的流体渗流效应采用了类似于故障传递率乘子数据的参数来表征,从而大大提高了操作效率。BZ3油田是一个深水三角洲油田。在沉积演化模拟和定量不确定度评价的基础上,建立了勘探评价配井、储量评价和开发方案研究的地质模型,储层预测精度大大提高,并通过新钻探的井进行了验证。通过定量的不确定性评价,为工程投资提供可靠的地质依据,避免了地质不确定性造成的投资浪费。Q32油田为河流相油田,已进入高含水(86.7%)期。在精细剩余油分布预测模型中,如何对横向吸积夹层(通常小于1米)进行表征比较困难,因此对老油田采用了上述方法。首先建立常规地质模型,然后根据配置结果提取侧向吸积夹层作为界面,利用该界面提取数值模拟模型中的透射率乘数参数;编写了一个软件来执行整个过程。利用该方法布置了100多口调整井,取得了较好的生产效果。这些地质建模技术在渤海湾海上油田开发的不同时期得到了广泛的应用,包括BZ2、JZ2、KL10、CFD6、SZ3和JZ9。这保证了这些油田的高质量、高效率开发。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Innovation and Practice of Geological Modeling Techniques in Complex Clastic Reservoir of Bohai Bay Offshore Oilfield
Bohai oilfield located at Bohai Bay of China mainly consists of complex clastic reservoirs. Reservoir prediction is difficult especially in the deep depth oilfields because of low seismic resolution. In addition, how to quantitatively characterize the risk of new oilfield development and how to build a more elaborate model in the late period of oilfield development are particularly challenging. This paper developed an innovative workflow for complex clastic reservoir characterization of offshore oilfield. A modeling method based on sedimentary evolution simulation, which can provide modeling constraints, is proposed for deep depth oilfields. Through sedimentary evolution modeling and other information, reservoir and structure uncertainty are analyzed, then reserves scale and reservoir connectivity are evaluated through experimental design, geological modeling and streamline simulation; 3p models are selected lastly. A new method is proposed for building an elaborate model of old oilfield with less grid amounts. The fluid seepage effect caused by some small scale configuration units is characterized by a parameter similar to fault transmissibility multiplier data in numerical simulation model, for there is no actual modeling of the configuration units, so the operation efficiency is greatly improved. BZ3 oilfield is a deep depth delta oilfield. A geological model was established for exploration evaluation well placement, reserves evaluation and development plan research based on sedimentary evolution simulation and quantitative uncertainty evaluation, the reservoir prediction accuracy is greatly improved that is confirmed by new drilled wells. Through quantitative uncertainty evaluation, reliable geological basis was provided for engineering investment, which can avoid the investment waste caused by geological uncertainty. Q32 oilfield is a fluvial oilfield that has come into high watercut (86.7%). How to characterize the lateral accretion interlayer (often less than 1 meter) in model for fine remaining oil distribution prediction is difficult, thus the method mentioned above for old oilfield was used. Firstly, a conventional geological model was established, then the lateral accretion interlayer was extracted as interface from it based on configuration results, then the interface was used to extract the parameter named transmissibility multiplier data in the numerical simulation model; a software has been compiled to perform the whole process. Based on the method, more than 100 adjusting wells were disposed and better production results were obtained. These geological modeling techniques have been widely applied in Bohai Bay offshore oilfields in different periods of oilfield development, including BZ2, JZ2, KL10, CFD6, SZ3, and JZ9. This ensures that these oilfield developed with high quality and efficiency.
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