本文選題：油藏特征　切入點(diǎn)：沉積微相　出處：《西北大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：葉兒莊油區(qū)位于鄂爾多斯盆地的中西部,勘探周期長(zhǎng),現(xiàn)已步入穩(wěn)產(chǎn)階段。研究區(qū)主力產(chǎn)油層位延長(zhǎng)組長(zhǎng)6、長(zhǎng)8油層組,單井日產(chǎn)量變化較大,且相鄰油井的產(chǎn)量也有很大的差異,初探結(jié)果顯示,油藏分布不均是引起該種差異的主要原因。本文通過對(duì)葉兒莊地區(qū)巖心、測(cè)井、分析化驗(yàn)等資料的綜合分析,對(duì)本區(qū)地層、沉積相、儲(chǔ)層及油藏特征進(jìn)行詳細(xì)剖面,綜合分析本區(qū)油藏成藏模式,為油田后期的勘探開發(fā)提供可靠的依據(jù)。葉兒莊地區(qū)長(zhǎng)6、長(zhǎng)8儲(chǔ)層主要發(fā)育北西-南東向的水下分流河道砂體,其在橫向上連片分布,在縱向上相互疊置,為油藏提供了有利的儲(chǔ)集空間。長(zhǎng)6儲(chǔ)層巖石類型主要為巖屑長(zhǎng)石砂巖,長(zhǎng)8儲(chǔ)層主要為巖屑長(zhǎng)石砂巖和長(zhǎng)石巖屑砂巖。砂巖顆粒較細(xì),分選磨圓性較好。儲(chǔ)層中填隙物較發(fā)育,其中長(zhǎng)6儲(chǔ)層中鐵方解石、高嶺石較為發(fā)育,長(zhǎng)8儲(chǔ)層中綠泥石、鐵方解石較為發(fā)育,長(zhǎng)6、長(zhǎng)8儲(chǔ)層均處于晚成巖A期階段。研究區(qū)長(zhǎng)6、長(zhǎng)8儲(chǔ)層均屬于特低孔、特低滲儲(chǔ)層,其中長(zhǎng)6儲(chǔ)層物性略好,其孔隙度平均值為11.22%,滲透率平均值為0.52×10-3μm2；長(zhǎng)8儲(chǔ)層孔隙度平均值為9.29%；滲透率平均為0.47×10-3μm2,綜合評(píng)價(jià)為低孔低滲儲(chǔ)層。長(zhǎng)6、長(zhǎng)8儲(chǔ)層非均質(zhì)性較強(qiáng),其中長(zhǎng)8儲(chǔ)層非均質(zhì)性強(qiáng)于長(zhǎng)6儲(chǔ)層。儲(chǔ)層孔隙主要以粒間孔為主,其中長(zhǎng)8儲(chǔ)層的粒間孔較為發(fā)育,長(zhǎng)6儲(chǔ)層主要發(fā)育粒間孔,其次是長(zhǎng)石溶孔,孔隙為油氣的儲(chǔ)集提供了有利的空間。葉兒莊地區(qū)油藏多發(fā)育在三角洲分流河道沉積中心,油藏類型為典型的巖性油藏,其中長(zhǎng)8儲(chǔ)層中油層較為發(fā)育,鉆遇率較高。長(zhǎng)7烴源巖為本區(qū)提供了較為充足的油氣,形成上生下儲(chǔ)(長(zhǎng)8)和上儲(chǔ)下生(長(zhǎng)6)的儲(chǔ)蓋組合。長(zhǎng)6、長(zhǎng)8儲(chǔ)層油藏主要受沉積相控制,油藏的成藏模式是由于過剩壓力而使得油氣在垂向上向上或向下運(yùn)移,其中長(zhǎng)6儲(chǔ)層中成藏模式主要為油氣通過疊置滲透砂體運(yùn)移成藏和通過微裂縫運(yùn)聚成藏兩種模式；長(zhǎng)8儲(chǔ)層油藏成藏模式主要為儲(chǔ)層與烴源巖直接接觸成藏和油氣通過疊置砂體運(yùn)聚成藏兩種模式。
[Abstract]:The Yeerzhuang oil area is located in the central and western part of the Ordos basin. The exploration period is long and it has entered the stage of stable production. The primary results show that the uneven distribution of the reservoir is the main cause of the difference. Through the comprehensive analysis of the core, logging, analysis and laboratory data in Yelzhuang area, the formation of this area is analyzed in this paper. The sedimentary facies, reservoir and reservoir characteristics are profiled in detail, and the reservoir forming model in this area is comprehensively analyzed. The reservoir Chang6 and Chang 8 in Yelzhuang area are mainly developed by NW-SE distributary channel sand bodies, which are distributed horizontally and overlapped with each other vertically. The rock types of Chang 6 reservoir are mainly lithic feldspathic sandstone, while Chang 8 reservoir is mainly lithic feldspathic sandstone and feldspathic sandstone. In Chang 6 reservoir, iron calcite and kaolinite are more developed, and in Chang 8 reservoir chlorite and iron calcite are more developed. Chang 6 and Chang 8 reservoirs are all in late diagenesis A stage. Chang 6 and Chang 8 reservoirs belong to very low porosity and very low permeability reservoirs, in which the physical properties of Chang 6 reservoir are slightly better. The average porosity is 11.222.The average permeability is 0.52 脳 10 ~ (-3) 渭 m ~ (2); the average porosity of Chang 8 reservoir is 9.29; the average permeability is 0.47 脳 10 ~ (-3) 渭 m ~ (2). Among them, the heterogeneity of Chang 8 reservoir is stronger than that of Chang 6 reservoir. The porosity of Chang 8 reservoir is mainly intergranular pore, the intergranular pore of Chang 8 reservoir is more developed, the intergranular pore is mainly developed in Chang 6 reservoir, the next is feldspar solution pore. The porosity provides favorable space for oil and gas reservoir. The reservoir in Yeerzhuang area is mostly developed in the center of delta distributary channel sedimentation, and the reservoir type is typical lithologic reservoir, and the reservoir in Chang 8 reservoir is relatively developed. The source rock of Chang 7 provides sufficient oil and gas for this area and forms reservoir cap assemblage of upper generation and lower reservoir (Chang 8) and upper reservoir and lower generation (long 6). The reservoirs of Chang 6 and Chang 8 are mainly controlled by sedimentary facies. The reservoir forming model is that oil and gas migrate vertically up or down due to excess pressure. The reservoir forming model in Chang 6 reservoir mainly consists of two models: oil and gas migration and accumulation through overlay permeable sand body and accumulation through micro-fracture. The reservoir formation model of Chang 8 reservoir is mainly composed of two models: direct contact between reservoir and source rock and accumulation of oil and gas through superimposed sand bodies.
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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