姬塬油田罗1井区长8_1储层特征及影响因素分析

The charactristics and influential factors of Chang 8_1 reservior in Luo 1,Jiyuan Oilfield

目的探究姬塬油田储层特征,为油田下一步科学开发提供理论依据。方法利用岩心录井资料、测井资料、铸体薄片、扫描电镜、毛细管压汞等多种分析测试资料进行综合分析。结果研究区储层岩性以灰绿色细粒长石岩屑砂岩为主,其次为岩屑长石砂岩,成熟度较低;储集空间主要为粒间孔和溶孔,其中溶蚀作用成为改善储层物性的关键;孔隙结构以小孔-微喉型为主,进汞曲线特征为平台不明显,孔隙结构非均质性强,退汞效率较低;储层平均孔隙度为10.19%,平均渗透率为0.78×10-3μm2,属特低孔、特低渗储层。结论成岩作用对储层特征具有重要的影响,压实作用对储层主要起破坏性作用,溶解作用是研究区储层得到改善的关键因素,胶结作用对储层的改造具有双重作用,这与胶结物的类型及其产状有关。

Aim To study the reservoir characteristics and provide the theoretical basis for the the oil field＇s next step scientific development. Methods By a comprehensive analysis of coring, logging, well logging data, and lots of test data such as cast thinning, scanning electron microscopy, capillary mercury penetration, etc. Results The main lithology of Chang 81 reservoir of Luo 1 well field is gray-green feldspathic litharenite, followed by lithic arkose, with low maturity; intergranular pore and dissolved pore are the main space of Chang81 reservior, in which denudation is the key factor to improve the physical property; pore structure of Chang 81 reservior is mainly micro pore and throat, the main features of the platform into the curve of mercury is not obvious, with strong pore structure heterogeneity, ejection efficency is low; Chang 81 reservior presents average porosity value of 10. 19% and average permeability value of 0. 78 × 10 -3 μm2 which shows it is an extremely low porosity and permeability reservoir. Conclusion Diagenesis have an important influence for reservoir characteristic. Compaction mainly destroy reservoir, while dissolution is the key factor to improve the quality of reservoir. Cementation have double action to reform the reservoir, it depends on the type and attitude of the cement.