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鄂尔多斯盆地中生界延长组主要发育“低渗、低压、低丰度”的“三低”油藏,油藏受优质烃源岩和大型储集砂体控制。勘探实践中,突破了传统的理论认识和勘探思路,不断创新和完善了低渗透油藏勘探理论体系,构建了曲流河三角洲成藏模式、辫状河三角洲成藏模式、多层系复合成藏模式、坳陷湖盆中部成藏模式和致密油成藏模式等,不断开创了石油勘探的新局面。包括:以曲流河三角洲成藏理论为指导,在陕北地区找到了储量超10×108t的大型含油区带;构建盆地西南辫状河三角洲成藏模式,在陇东地区发现了储量规模达10亿吨级的整装大油田;创建多层系复合成藏模式,在姬塬地区落实了超15亿吨级的规模储量;创立内陆坳陷湖盆中部成藏理论,在华庆地区勘探中取得重大突破;大力推进致密油地质研究与技术攻关,在鄂尔多斯盆地形成了新的规模储量接替区。通过创新地质理论、突破关键技术、推行勘探开发一体化和转变发展方式,提高了“三低”油田的综合勘探效益,夯实了低渗透油田快速发展的资源基础,取得了巨大的经济和社会效益。
The Ordos Basin Yanchang Formation mainly develops “low permeability, low pressure, low abundance” “three low ” reservoirs controlled by high quality source rocks and large reservoir sand bodies. Exploration practice, breaking through the traditional theoretical understanding and exploration ideas, and constantly innovate and improve the theory of low permeability reservoir exploration system, constructed meandering delta reservoir formation, braided river delta accumulation mode, multi-layer complex into Reservoir model, the central depression basin model of accumulation and tight oil accumulation mode, and constantly open up a new situation in oil exploration. Including the following: In the meandering river delta reservoir formation theory as a guide, a large oil-bearing zone with a super-reserve of 10 × 108t has been found in the northern part of Shaanxi Province. In the basin southwest braided river delta reservoir-forming model, 1 billion tons of fully assembled large oil fields; to create a multi-layer system of composite reservoir-forming model in the Jiyuan region to implement the 1.5 billion-ton scale reserves; the establishment of inland depression lacustrine reservoir formation theory, in Huaqing area Significant breakthroughs have been made in exploration. Geological research and technological research on tight oil has been vigorously promoted, and a new reserve of large-scale reserves has been formed in the Ordos Basin. Through innovative geological theories, breaking through key technologies, pushing forward the integration of exploration and development and transforming development modes, the comprehensive exploration benefits of the “three low” oilfields have been enhanced, the resource base for rapid development of low-permeability oilfields has been consolidated, and huge economic and economic benefits have been achieved Social benefits.