志丹油田樊川区长6油层沉积与储层特征研究
Sedimentary Features and Reservoir Characteristics of Chang 6 Strata of Fanchuan District, Zhidan Oilfield
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摘要: 通过铸体薄片、扫描电镜、X-衍射、压汞分析、岩心物性及测井资料分析,对樊川区延长组长6储层的沉积特征和储层特征进行了综合研究。研究结果表明,樊川区长6储层为陆相湖泊三角洲沉积体系,主要的沉积相类型为三角洲前缘亚相的水下分流河道和水下分流间湾沉积微相以及前三角洲亚相。储层岩性主要为细粒长石砂岩,其次为粉-细粒长石砂岩及中-细粒长石砂岩。研究区成岩作用较强烈,主要的成岩作用类型有压实作用、压溶作用、胶结作用和溶蚀作用。其中,压实、压溶和胶结交代作用使储层的物性降低,而溶蚀作用又在一定程度上改善了储集性能。研究区长6储层储集空间以粒间孔和溶孔为主,孔隙度较好但渗透率较低,属于中孔低渗储层。综合沉积、砂体、成岩、孔隙结构、物性等参数,可将樊川区长6储层划分为4种不同类型,分别为粒间孔-溶孔型组合、溶孔-粒间孔型孔隙组合、粒间孔型孔隙组合和溶孔-粒间孔型的孔隙组合。其中,Ⅰ类储层是区内延长组最好的储集层,长61和长62油层亚组均有分布。Ⅱ类储集层是区内延长组较好的储集层,主要分布在长61油层亚组。Ⅲ类储集层是区内延长组较差的储集层,样品主要集中在长61油层亚组。Ⅳ类为非储层,该类样品在长62和长63油层亚组各有个别样品分布。Abstract: According to casting thin section identification, SEM, XRD, mercury-injection test, core analysis and logging data, the sedimentary features and reservoir characteristics of Chang 6 oil-bearing layer are comprehensively studied. It is shown that the sedimentary facies of Chang 6 layer in Fanchuan district of Zhidan oilfield is a set of continental lake delta sedimentary system, with the subfacies of delta front and prodelta. The reservoir is mainly composed of fine, silt-fine and medium-fine grained feldspar sandstone. There are strong diagenesises in the study area which include compaction, pressolution, cementation and dissolution. Though the first three diagenesises tend to lower the physical properties of reservoir, dissolution can improve the property to some extent instead. The reservoir space are mainly intergranular pores and feldspar dissolution pores. Based on its fine porosity and low permeability, the reservoir belongs to medium porosity and low-permeability reservoir. According to reservoir property parameters mentioned above, four types of reservoirs can be classified. The typeⅠis the best reservoir in the study area, which is mainly distributed in Chang 61 and Chang 62 reservoir. The typeⅡis a better one and distributed in Chang 61 reservoir. The sample of type Ⅲ is also mainly distributed in Chang 61 but has a poor property. With several samples distributing in Chang 62 and Chang 63 reservoir subgroups, the last type Ⅳ is too poor to be a reservoir.
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Keywords:
- sedimentary features /
- reservoir characteristics /
- pore type /
- Fanchuan district /
- Zhidan oilfield
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