基于数值模拟的生物礁气藏地层水分布研究

Numerical Simulation of Water Distribution of Bio-reef Gas Reservoir

杨丽娟 张明迪 王本成 温善志 刘远洋

YANG Lijuan ZHANG Mingdi WANG Bencheng WEN Shanzhi LIU Yuanyang

中国石化西南油气分公司勘探开发研究院, 四川 成都 610041

Exploration and Production Research Institute, Southwest Oil and Gas Company, SINOPEC, Chengdu, Sichuan 610041, China

对气水分布的正确认识是气井产水预测、气藏开发调整的关键，非均质性强的生物礁有水气藏气水分布通常很复杂，现有测井解释、地震解释等方法在对地层水分布的刻画方面均存在一定的局限性，数值模拟作为一种能充分结合地质静态认识及生产动态资料的技术，为研究地层水分布提供了一个重要手段。首先，对水侵活跃性参数进行分析、量化，并基于考虑储层非均质性的气藏三维模型进行水侵机理研究，分析气井生产指标对各参数的敏感程度；然后，结合地质认识及生产动态资料辨识出地层水赋存状态的最大可能情况，同时采用函数精细描述地层水分布；最后，获得与实际气藏更相符的精细数值模拟模型。研究加深了对元坝长兴组复杂生物礁气藏地层水分布的认识，研究思路也适用于其他各种类型的、非均质程度不同的有水气藏。

The distribution of gas and water is usually very complicated in water-bearing bio-reef gas reservoir with strong heterogeneity. The correct understanding of gas and water distribution is the key to forecasting water production and plan adjustment in development of gas reservoir. There are some limitations for the existing methods of logging interpretation and seismic interpretation to stratigraphic water distribution. Numerical simulation, a technique that can fully combine geological static knowledge and production dynamic data, provides an important means for studying formation water distribution. Firstly, to analyze and quantify the active parameters of water intrusion, and study water intrusion mechanism based on three-dimensional model of gas reservoir considering reservoir heterogeneity, analyze the sensitivity of gas well production index to various parameters. Then identify the most possible situation of formation water state based on geological knowledge and production dynamic data. At the same time, describe the formation water distribution in detail by function. Finally, a fine numerical simulation model that is more consistent with the actual gas reservoir is obtained. The research in this article has deepened the understanding of the formation water distribution of the Changxing complex reef gas reservoir in Yuanba. The research idea is also applicable to other types of water gas reservoirs with different degree of heterogeneity.

10.11885/j.issn.1674-5086.2020.02.26.01