摘要
从地质技术和理论两个方面对湖相致密油资源量和可采性进行了评价,讨论和解决了"在什么地方、有多少、可采出多少"这3个关键问题。研究认为:湖相致密油勘探层空间分布识别的关键是富有机质源岩层段和含油夹层的精细识别,利用测井一地球化学评价技术可识别出湖相地层中不同总有机碳区间的源岩层段,利用氢指数与总有机碳的相关性可实现湖相源岩层非均质性精细表征;湖相致密油勘探层油的赋存形式分为两类,一是砂岩、粉砂岩和碳酸盐岩夹层中呈游离态的致密油,二是富有机质源岩中吸附态和游离态的致密油;吸附油在目前的技术条件下难以开采,现阶段真正有工业价值的是游离油,根据实际地球化学数据可标定出源岩中游离油和吸附油量变化模型,从而可计算出游离油量、吸附油量和总原地油量。
From the viewpoints of the geological techniques and theories, the resource extent and its recoverability for lacustrine-facies tight oil are evaluated, the three key problems are discussed and solved： ＂where？ How much totally？ and How much can be produced？ ＂ The studies show that the key to recognize the spatial distribution of the oil in the explored zones is to finely distinguish the source-rock formations/members enriched the organic matter and oil-bearing interbeds, the formations/members with different TOCs in this facies of zone can be delineated by the well logging and geochemical evaluating techniques for the source rocks, with the help of the correlation between HI and TOC, the heterogeneous fine characterization of the source rocks can be realized ; the accumulated two forms of the tight oil in the lacustrine-facies explored zones are shown as follows： free tight oil in the interbeds between the sandstone/sihstone and carbonate, the absorbed and free tight oil in the organic matter-rich source rocks; the absorbed oil is difficult to produce under the conditions of the present techniques, the free oil really has industrial value nowadays, according to the actual geochemical data, the changed modes of the free and absorbed oils in the source rocks can be calibrated, thus the amounts of the free, absorbed and total in-situ oils can be calculated.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2013年第3期144-149,共6页
Petroleum Geology & Oilfield Development in Daqing
基金
国家重大专项“复杂结构井优化设计与控制关键技术”(2011ZX05009-005)
