匡立春 1胡文王宣 2王绪龙 1吴海光 2王小林2
作者信息
- 1. 中国石油新疆油田分公司，新疆克拉玛依83400
- 2. 南京大学 地球科学与工程学院，南京 210093
- 折叠
摘要
Abstract
Petrology and pore characteristics of the tight oil reservoir in the Lucaogou Formation, Jimusar Sag, were carefully studied by core observation, thin section identification, and EMPA analyses, with reference to outcrop profiles, and logging and seismic data. It was found that the reservoir section was heterogeneous and mainly consisted of rhythmically interbedded dolomite/siltstone and mudstone, with 3~5 rhythms in one section. Rock types identified include dolomitic siltstone, silty dolomite, dol-arenite, and dolomicrite, of which the former two were most widely distributed and served as the main reservoir rocks of the upper and lower reservoir segments (‘sweet points’) of the Lucaogou Formation;while dol-arenite was distributed only in the upper segment and dolomicrite occurred as thin interlayers in both segments. Observations of EMPA showed that dissolved pores, which could be subdivided into intragranular pores, intergranular pores and cracks, were the main pore type, and their diameter ranges from severalμm to 30μm. The minerals dissolved were mainly albite, followed by dolomite. As to the composition of the rocks, dolomitic siltstone and silty dolomite mainly consisted of albite, dolomite, and some potassium feldspar. Dol-arenite was composed of microcrystalline dolomite and some albite, and dolomicrite mainly consisted of microcrystalline dolomite and some quartz, albite and other minerals.关键词
吉木萨尔凹陷/芦草沟组/致密油储层/岩性特征/孔隙特征Key words
Jimusar sag/Lucaogou Formation/tight oil reservoir/lithology characteristic/porosity characteristic分类
天文与地球科学
