“有油推断”评价方法与潜山勘探实例

“Oil-Assumed Deduction” Assessment Method and Buried Hill Exploration Case

针对东部老油区日益复杂的勘探局面,提出了一种"有油推断"评价方法。其工作思路是根据油气成藏体系的基本原理提出的一种勘探目标逆推评价方法,具体流程为在成熟盆地的勘探中以圈闭为目标、以制约油气成藏的主控因素为核心来开展石油地质条件的综合分析研究工作,从而建立相应的油气成藏模式,以达到逐步缩小勘探风险的边际效应的目的。与传统方法相比,该方法不但可以提高富油气区勘探针对性,提升对潜在目标进行评价的效率,而且避免受以往勘探经验束缚,为应对富油气洼陷日益复杂勘探局面提供了有效措施。逆推评价的思路适用于"富油气凹陷"久攻未克勘探领域的部署研究。应用该方法快速落实成藏主控因素,成功突破了安福屯、高升等基岩领域的勘探禁区,开拓了岩性地层油气藏勘探新领域。

As for the increasingly complicated exploration situation in the old oil areas in East China, this article proposes an ＂oil-assumed deduction＂ assessment method, which is a backstepping evaluation of exploration targets based on the fundamental principle for oil and gas accumulation system. The process of the method is focused on the targets of traps in mature exploration of basins while centering the main factors controlling oil and gas accumulations, thus making comprehensive analysis and study of the petroleum geological conditions. The relative oil and gas accumulations model is established to fulfill the objective for gradual reduction of exploration risks and attainment of marginal effects. As compared to the traditional method, this method not only improves exploration of oil and gas abundant zones and evaluation efficiency for potential targets but also gets rid of restrictions from the past exploration experiences, offering an effective measure for exploration of increasingly complicated oil and gas abundant sags. The mindset of basckstepping evaluation is also suitable for settlement of exploration bottlenecks in the ＂oil and gas enriched sag＂ field. With this method used to identify the main factors controlling oil and gas accumulations, breakthroughs have been made in basement exploration of Anfutun and Gaosheng buried hill areas, opening up the new field of lithological stratigraphic oil and gas exploration.