冀中坳陷深县凹陷深南背斜构造带精细油藏再评价与实践

Meticulous Hydrocarbon Reservoir Re-evaluation and Practice in Shennan Anticline,Shenxian Sag,Jizhong Depression

深南背斜为冀中坳陷深县凹陷主要含油构造,油藏具有"小、碎、贫、散"的特点。在分析勘探开发制约因素的基础上,提出了"重新认识、精细评价和整体部署"的精细油藏再评价思路。通过开展高分辨率地震资料连片处理、井震结合油组划分对比、多手段精细构造解释、精细砂体展布分析、精细老井复查等研究,发现有利钻探目标。重新认识深南背斜油藏特征,认为该区储集砂体发育适中,具有满构造含油特点,尤其在背斜翼部,可以形成牙刷状油藏模式,该模式具有含油层系多、累计厚度大、产量高的特征。断层侧向封堵是油藏主控因素,主要取决于岩性配置和演化过程,继承性断层的演化过程有利于产生泥岩涂抹,因此侧向封堵性好。根据该区油藏特点,实施多靶点斜井钻探是提高勘探成效的有效方式,通过实施取得良好钻探成效。

Shennan anticline is a main oil-bearing composition of Shenxian sag with ＂small, fractured, lean and disseminated＂ reservoirs. Based on analyzing the factors restricting exploration and development, this paper proposed ＂re-recognition, meticulous evaluation and overall deployment＂ to re-evaluate hydrocarbon reservoir. Favorable prospecting targets are discovered through carrying out high-resolution seismic data merging processing, oil group division and correlation based on well-log and seismic data, multi-means meticulous structure interpretation, meticulous sandbody distribution analysis, and meticulous old well reexamination. The research indicates that the reservoir sandbody of Shennan anticline develops moderately and bears oil throughout all its structure, especially, toothbrush-shape reservoir model could be generated in anticlinal wing. This model features in multiple oil bearing series, big total thickness, and high production. The fault cross-range is the main factor controlling reservoirs, which is mainly determined by lithological array and evolving process. The evolving process of inherited faults is favorable for creating shale smear, which endows the faults with better cross-range. Considering the characteristics of the reservoir, multi-target deviated well drilling is the most effective way to enhance exploration. The good effect has been proved by practice.