ENRICHMENT CHARACTERISTICS AND RESOURCE POTENTIAL OF SHALE OIL IN THE FIRST MEMBER OF QINGSHANKOU FORMATION IN SOUTHERN SONGLIAO BASIN
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摘要:
松辽盆地南部长岭凹陷青一段发育一套优质的半深湖-深湖相暗色页岩，沉积厚度大，分布稳定.页岩层系内存在大量滞留烃，具有可观的页岩油资源潜力.利用大量录井、测井、试油、岩心及分析测试资料，对青一段页岩滞留烃含量及分布、岩相组合、储集空间、矿物组成等富集主控因素进行了全面分析.结果表明，青一段页岩中滞留烃性质以中-轻质油为主，流动性好，在纵向上主要富集在1800~2500 m范围内.青一段页岩可划分为层理型、纹层型、互层型3种岩相类型，其中层理型和纹层型滞留烃含量高，TOC主体大于1.5%，有机质类型以Ⅰ、Ⅱ1型为主，热解S1主体大于2×10-3，孔隙度大于5.5%，孔径以介孔-宏孔为主，脆性矿物含量大于50%，可压性好，是主要的页岩油富集模式.通过富集主控因素叠合及有利岩相评价，优选乾安富集区部署实施吉页油1HF井，经压裂测试获得16.4 m3/d的高产页岩油流.采用热解S1法初步估算长岭凹陷青一段页岩油资源量为35×108 t，证实了松辽盆地南部具有可观的页岩油资源潜力.
Abstract:There is a set of high quality semi-deep to deep lacustrine dark shale developed in the first member of Qingshankou Formation(K2qn1) in Changling Sag, southern Songliao Basin, with large sedimentary thickness and stable distribution. A lot of residual hydrocarbon exists in shale layers with shale oil resource potential. Based on massive data of well logging, oil testing, core sampling and experimental test, the paper comprehensively analyzes the main controlling factors of enrichment including content and distribution of residual hydrocarbon, lithofacies assemblages, reservoir space and mineral compositions in the shale. The results show the residual hydrocarbon is mainly medium-light oil, with good fluidity and enrichment range of 1800-2500 m vertically. The shale of K2qn1 can be divided into bedded, laminated and interbedded lithofacies types, and the content of residual hydrocarbon in the former two types is high, with TOC more than 1.5% generally, Type Ⅰ and Type Ⅱ1 of organic matters, pyrolysis S1 more than 2×10-3, porosity more than 5.5%, mesoporous-macroporous pore size, brittle mineral content more than 50% and good fracturing property, which is the major enrichment pattern of shale oil. Through superposition of main controlling factors of enrichment and evaluation of favorable lithofacies, JYY-1HF well is optimized and deployed in Qian'an enrichment area and 16.4 m3/d of shale oil flow is yielded after fracturing. The shale oil resource of K2qn1 in Changling Sag is estimated to be 35×108 t by pyrolysis S1 method, proving that the southern Songliao Basin has considerable shale oil resource potential.
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Key words:
- shale oil /
- enrichment characteristics /
- lithofacies type /
- JYY-1HF well /
- Qingshankou Formation /
- Songliao Basin
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