塔里木盆地克拉2气田断裂地质力学活动性对水侵的影响

发布时间：2018-02-03 15:33

本文关键词： 克拉气田断裂地质力学活动性地应力场水侵　出处：《天然气地球科学》2017年11期 　论文类型：期刊论文

【摘要】：中国陆相最大天然气田——克拉2气田经过10余年的高速开发后,目前面临气井快速见水和气水界面非均匀抬升等问题。为进一步明确复杂构造背景下的高压气田水侵机理,开展了气田内部基于断裂的地质力学活动性及其与气井见水之间的关联性研究。将气田四维地应力场建模和三维断裂力学分析相结合,建立了随气田开发的断裂力学活动性预测模型,研究了断裂活动性对气田水侵的影响。结果表明:(1)气井见水与井旁断裂力学特征变化有较好的关联性,随着气藏开采及现今地应力场的动态变化,断裂面受力状态也随之改变,从而使断裂带内部渗透性变强或变弱。(2)随气藏地层压力的下降,若井旁断层和裂缝活动性增加或保持较好,则气井见水较早,气水界面抬升较快。(3)由于气田内部应力场和断裂分布均较复杂,因此不同构造部位的断裂活动性差异较大,从而造成不同位置气水界面抬升不均匀且相差较大。研究进一步明确了克拉2气田的水侵机理,并利用断裂地质力学活动性指数将气藏划分为3个见水风险区,为气田开发方案优化提供依据。
[Abstract]:After more than 10 years of high speed development, China's largest natural gas field-Kela 2 gas field has been developed. In order to further clarify the water invasion mechanism of high pressure gas fields under the complex structure background, it is faced with the problems of rapid water discovery in gas wells and non-uniform uplift of gas-water interface at present. In this paper, the relationship between fracture based geomechanical activity in gas field and gas well water is studied, and the four dimensional stress field modeling and three dimensional fracture mechanics analysis are combined. The prediction model of fracture mechanics activity with gas field development is established, and the influence of fault activity on gas field water invasion is studied. The results show that there is a good correlation between the water breakthrough of gas well and the change of mechanical characteristics of borehole fracture. With the development of gas reservoir and the dynamic change of in-situ stress field, the stress state of fault surface also changes, which makes the permeability of fault zone become stronger or weaker. 2) with the decrease of formation pressure of gas reservoir. If the activity of adjacent faults and fractures is increased or maintained, the gas wells will see water earlier, and the gas-water interface will rise faster. (3) because of the complex stress field and fault distribution in the gas field. Therefore, there are great differences in fault activity in different structural positions, resulting in uneven uplift of gas-water interface in different locations. The study further clarifies the water invasion mechanism of Kela 2 gas field. The gas reservoir is divided into three water-exposed risk areas by using the activity index of fault geomechanics, which provides the basis for the optimization of the development plan of the gas field.
【作者单位】：中国石油塔里木油田分公司;
【基金】：国家重大科技专项(编号:2011ZX05046) 中国石油天然气股份有限公司重大科技专项(编号:2014E-2104)联合资助
【分类号】：P618.13;TE37
【正文快照】： 1735-1744.[江同文,张辉,王海应,等.塔里木盆地克拉2气田断裂地质力学活动性对水侵的影响[J].天然气地球科学,2017,28(11):1735-1744.]0引言断裂与地应力场在时空上的配置关系,决定断裂发育的类型,同时也影响油气藏的形成、保存及演化[1-4]。在油气开发中,断裂的地质特征也严

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