姬塬油田马家山地区长4+5油层组储层特征与评价研究

Reservoir Characteristics and Evaluation of Chang 4+5 Oil Memberof Majiashan area,Jiyuan Oilfield,Ordos Basin

利用岩石铸体薄片鉴定、X射线衍射分析、扫描电镜分析等多种测试手段,对鄂尔多斯盆地姬塬油田马家山地区延长组长4+5油层组储集岩的岩石学特征、物性特征和成岩作用进行了分析。结果表明,该储集岩为粉细—细粒岩屑质长石砂岩,成分成熟度普遍较低,结构成熟度中等—较好;储层岩石经历了压实、胶结、压溶和溶解等一系列成岩作用,具有低孔低渗的特点。结合压汞分析、孔隙组合分析,对储层进行综合分类评价,认为长4+5油层组的储层类型可分为3类,Ⅰ类、Ⅱ类储层为较好的储层,是当前技术条件下主要开发利用的储层。

The reservoir rock of the Chang 4＋5 oil member in Majiashan area, Jiyuan Oilfield has been studied on lithology characteristic, diagenesis and petrophysical property using casting thin section, X-ray diffraction, scanning electron microscope analysis and so on. It shows that the reservoir rock consists of silty and fine-grained arkose, and has low compositional maturity and medium textural maturity. The clastic rocks experienced a series of complex diagenesis as compaction, cementation, pressure solution and dissolution. The sandstones are low porosity and low permeability. Based on the research of mercury analysis and pore construction analysis, the reservoir is evaluated synthetically. The reservoir is classified into three types, and at present type Ⅰ and Ⅱ are good reservoirs for production.