濮卫次洼沙三段页岩油藏勘探潜力与实践

Exploration potential and practice of Es3 shale reservoir in Puwei Sag

高平 张放东 尚雅珍

中国石化中原油田分公司勘探开发科学研究院，河南 濮阳 457001

Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China

濮卫次洼具有形成页岩油藏的特殊石油地质条件。沙三段长期处于沉积中心，发育多套厚层盐岩，盐间、盐下泥页岩有机质丰度高，处于以生油为主的阶段；沙三中盐岩覆盖了整个濮卫次洼，页岩中的各种微裂缝及所夹持的粉砂岩条带是主要的储集空间，并且储集层与烃源岩同层，形成封闭的独立成藏系统，油气广泛分布、富集，为页岩油藏的形成奠定了基础。以濮卫次洼盐间、盐下沙三段页岩油为重点探索领域，开展页岩岩电性特征与储集空间类型研究，以普遍见油气显示的厚层页岩段为单元，开展针对页岩油探索的部署试验，结合老井试油，取得初步效果，打开了页岩油藏的勘探局面。

Puwei Sag possesses the remarkable petroleum geological conditions of forming shale reservoir. Es3 reservoir has been in the deposition center for a long time with multiple sets of thick rock salts. The abundance of organic matter for the shale deposited in intro-salt and under-salt is high and is at the stage of oil-prone generation. The whole Puwei Sag is salt-covered. Micro-fractures in the shale and the siltstone interlayer between shale settings are the main reservoir spaces. Reservoir and source rock are all in clastic belts between or beneath the salt cap and forming a closed and isolated petroleum reservoir forming system. Widely distributed and enriched oil and gas lay the foundation for shale oil reservoir forming. This paper studies the rock electrical characteristics and reservoir space types of shale taking the shale deposited in intro-salt and under-salt in Puwei Sag as a key exploration area. Shale oil exploration deployment is tested based on a unit of thick shale intervals with common oil and gas show. Combined with the oil testing of mature wells, preliminary effect has achieved, consequently, a new shale exploration field of shale has emerged.

10.6056/DKYT201401009