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化子坪西区主要含油层位为三叠系延长组长2、长6油层组,属于低渗透致密油藏,储层“四性”关系复杂,自然产能极低,只有经过压裂改造后才可获得经济产能。目前该区整体产能低下,开发效果较差,需要进行加密、补孔、层系调整等措施,因此利用岩心分析、孔渗物性、试油试采等资料并结合测井资料对该区“四性”关系和物性下限进行研究,为综合治理方案选井选层提供地质基础支撑。研究表明:长2油层组地层岩性主要为褐灰色油浸细砂岩、浅褐灰色油斑细砂岩,为低孔低渗储层,孔隙度下限大约为8.2%,渗透率下限为0.55×10~(-3)μm~2,工业产能油层孔隙度在8.2%以上,渗透率在0.55×10~(-3)μm~2以上,地层电阻率在11.8Ω·m以上;长6油层组地层岩性为砂泥岩互层,主要以差油层为主,为特低孔、特低~超低渗透储层,孔隙度下限大约为6.5%,渗透率下限为0.17×10~(-3)μm~2,工业产能油层孔隙度在6.7%以上,渗透率在0.3×10~(-3)μm~2以上,地层电阻率在15.9Ω·m以上。
The main oil reservoir in the western part of the Huaziping area is the Chang 2 and Chang 6 oil reservoirs of the Triassic Yanchang Formation. These reservoirs belong to the low permeability and tight reservoirs. Because of the complex relationship between the reservoir and the “quaternary” reservoir and extremely low natural productivity, Before they can get economic capacity. At present, the overall production capacity of this area is low, and the development effect is poor. Therefore, some measures such as encryption, fill holes and stratification adjustment are needed. Therefore, using core analysis, porosity and permeability test, test oil test and other data and logging data, Four "relationship and the lower limit of physical properties to conduct research, comprehensive management options for the selection of wells to provide geological support. The results show that the lithology of Chang 2 reservoir is mainly composed of brown-gray oil-bearing fine sandstone and light brown-gray oil-spot fine sandstone, with low porosity and low permeability reservoir. The lower limit of porosity is about 8.2% and the lower limit of permeability is 0.55 × 10 ~ (-3) μm ~ 2, the porosity of industrial production is above 8.2%, the permeability is over 0.55 × 10 ~ (-3) μm ~ 2 and the formation resistivity is above 11.8Ω · m. The lithology is sand-mudstone interbedded layer, mainly composed of poor oil layers, especially low-porosity and ultra-low-permeability reservoirs. The lower limit of porosity is about 6.5% and the lower limit of permeability is 0.17 × 10 -3 m ~ 2. The porosity of industrial production reservoir is above 6.7%, the permeability is above 0.3 × 10 ~ (-3) μm ~ 2 and the formation resistivity is above 15.9Ω · m.