方芹
FANG Qin

• 1:中国石油化工股份有限公司西北油田分公司

摘要(Abstract)：

为了研究油藏开发中后期微断层控制的剩余油分布,以塔河Ⅸ区下油组油藏为例,从微断层的发育背景、形成机理出发,在对微断层的发育规律和组合特征总结分析基础上,应用定性和定量的微断层封闭性评价技术,对开发中后期的微断层封闭性进行了研究。认识到,塔河Ⅸ区下油组的微断层是在天山主压应力派生的次级压应力作用下形成的,由雁列式走滑断层、里德尔剪切破裂和同向剪切破裂等组成的,平面上呈并列式、带状/线状雁列式、放射状等组合样式,剖面上呈垒堑式、阶梯式、"Y"字形等组合样式,并据此划分了6个微断层发育构造单元、7类微断层平面组合样式和8类微断层剖面组合样式。微断层封闭性评价结果表明,断层涂抹因子是评价微断层封闭性的重要指标;同时认识到走滑作用控制的塔河Ⅸ区微断层断距越大、倾角越大、断层涂抹越好,则封闭性越好,即主位移带发育的平面雁列式—剖面阶梯式微断层封闭性较好。该研究成果对类似塔河Ⅸ区走滑作用控制的微断层油藏中后期剩余油挖潜具有一定的指导意义。
In order to research the distribution law of the remained oil controlled by the micro-fault in the middle and late stages of the reservoir development, taking Lower Oil Group in Block Ⅸ of Tahe Oilfield as an example, from the viewpoints of the development background and formation mechanism of the micro-fault, based on the analysis of the development rules and combined characteristics of the micro-fault, the qualitative and quantitative micro-fault sealing-capacity evaluation techniques were used to study the micro-fault sealing capacity in the middle and late stages of the development. The micro-faults of Lower Oil Group in Block Ⅸ of Tahe Oilfield were formed under the secondary compressive stress derived from the main compressive stress of the Tianshan Mountains and consisted of the echelon strike-slip fault, Riddle shear fracture, and co-directional shear fracture. On the surface, the combination styles are shown as follows: side-by-side, band/line echelon and radial. While on the cross-section, the combination styles are presented as follows:graben, step and "Y-type", and moreover on the bases stated above, they are divided into 6 structural units of the micro-fault development, 7 types of the micro-fault planar combination and 8 types of the micro-fault cross-section combination. The micro-fault sealing-capacity evaluation results show that the fault smearing factor is the important indicator for evaluating the sealing capacity. The greater the fault displacement, the greater the dip, the better the fault smearing and sealing capacities of the micro-fault in Block Ⅸ of Tahe Oilfield controlled by the strike-slip effect. That is, the planar echelon and sectional stepped micro-fault of the main displaced zone has better sealing capacity. The research results provide a certain guiding significance for the potential tapping of remained oil in the middle and late stages in micro-fault reservoirs controlled by the strike-slip effect that is similar to Block Ⅸ of Tahe Oilfield.

关键词(KeyWords)： 微断层;形成机理;断层特征;断层封闭性;塔河Ⅸ区
micro-fault;forming mechanism;fault characteristic;fault sealing capacity;Block Ⅸ of Tahe Oilfield

Abstract:

Keywords:

基金项目(Foundation): “十三五”国家科技重大专项“塔里木盆地碳酸盐岩油气田提高采收率关键技术示范工程项目”(2016ZX05053)

作者(Author): 方芹
FANG Qin

DOI: 10.19597/j.issn.1000-3754.202001021

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