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针对四川盆地中部地区侏罗系致密油资源潜力、储集层类型、油藏类型以及增产改造工艺技术开展攻关研究。通过致密油资源评价方法估算侏罗系5套油层石油资源量达16′108 t,表明侏罗系石油资源潜力大。通过岩心描述、薄片观察、试井、试采等静态、动态资料综合分析认为,侏罗系主要为特低孔、特低渗的裂缝-孔隙型储集层,而不是传统认为的单一裂缝型储集层;油藏类型主要为近源充注、连续型分布的致密油;优质烃源岩、物性较好的储集层和裂缝是致密油富集的主控因素。沙一段砂岩、大安寨段介壳灰岩储集层现场试验表明,水平井体积压裂和水平井压裂酸化具有较好的增产改造效果。
Aimed at the potential of Jurassic tight oil in the central region of Sichuan Basin, reservoir type, reservoir type and production technology were studied. The tight oil resources assessment method estimates that the Jurassic 5 sets of oil resources amount to 16’108t, indicating that Jurassic petroleum resources have great potential. According to the static and dynamic data analysis of core description, thin sheet observation, well test and trial mining, the Jurassic is mainly fractured-pore reservoir of ultra-low porosity and ultra-low permeability, rather than the traditional single fracture type Reservoirs. The main types of reservoirs are near-source charging and continuous distribution of tight oil. High-quality source rocks, better-quality reservoirs and fractures are the main controlling factors for the enrichment of tight oil. Field tests of limestone reservoirs in the first sand section of Shahe and Daanzhai show that volumetric fracturing of horizontal wells and fracturing and acidizing of horizontal wells have a good stimulation and stimulation effect.