二连盆地阿尔凹陷快速评价成效与启示

Rapid Assessment Effect and Its Enlightenment in Aer Sag,Erlian Basin

阿尔凹陷是二连盆地近年来发现的一个新的小型含油凹陷,成藏条件相对复杂。在科学论证阿尔凹陷快速评价适用性基础上,在只有4口探井的前提下,油藏评价工作早期介入。分析认为阿尔凹陷油藏评价的制约因素包括地质资料少、储层横向变化大、油藏控制因素复杂等,提出了快速探明储量,快速高效建产的总体思路,采取科学论证、优化部署、深化地质综合研究等做法,应用地震特征识别、地震属性分析等技术预测砂体边界,反复构建构造—岩性油藏成藏模式,经过滚动扩块评价、下洼探索评价、逐步滚动扩边评价等快速评价具体实施,在不到3年的时间内,整装探明石油地质储量3436.27×104t,整体建成近40×104t的年生产能力。

Aer sag is a small oil-bearing sag newly discovered in Erlian Basin in recent years, of which reservoir-forming conditions are relatively complex. Reservoir assessment was conducted early under the premise of only four exploration wells, based on scientifically demonstrating the rapid assessment applicability of the sag. Analysis shows that there are many factors restricting reservoir assessment including less geologic data, great lateral change in reservoir, and complicated factors controlling reservoir, etc. This paper presented a general idea of rapid proven reserves and building capacity rapidly and efficiently. By means of scientific demonstration, optimized deployment, and comprehensive geological research, this paper used such techniques as seismic feature identification and seismic attribute analysis to predict sandbody boundary, built and updated structural-lithologic reservoir-forming models. Through rolling block-expanding assessment, assessment of sub-trough exploration, assessment of rolling boundary-extending step by step and other rapid assessment means, monoblock proved oil reserves reached 34.3627 million tons and annual production capacity closed to 400 000 tons in less than three years.