鄂尔多斯盆地叶儿庄地区延长组长6、长8油层组油藏特征研究

发布时间：2018-03-16 22:22

本文选题：油藏特征　切入点：沉积微相　出处：《西北大学》2015年硕士论文　论文类型：学位论文

【摘要】：叶儿庄油区位于鄂尔多斯盆地的中西部,勘探周期长,现已步入稳产阶段。研究区主力产油层位延长组长6、长8油层组,单井日产量变化较大,且相邻油井的产量也有很大的差异,初探结果显示,油藏分布不均是引起该种差异的主要原因。本文通过对叶儿庄地区岩心、测井、分析化验等资料的综合分析,对本区地层、沉积相、储层及油藏特征进行详细剖面,综合分析本区油藏成藏模式,为油田后期的勘探开发提供可靠的依据。叶儿庄地区长6、长8储层主要发育北西-南东向的水下分流河道砂体,其在横向上连片分布,在纵向上相互叠置,为油藏提供了有利的储集空间。长6储层岩石类型主要为岩屑长石砂岩,长8储层主要为岩屑长石砂岩和长石岩屑砂岩。砂岩颗粒较细,分选磨圆性较好。储层中填隙物较发育,其中长6储层中铁方解石、高岭石较为发育,长8储层中绿泥石、铁方解石较为发育,长6、长8储层均处于晚成岩A期阶段。研究区长6、长8储层均属于特低孔、特低渗储层,其中长6储层物性略好,其孔隙度平均值为11.22%,渗透率平均值为0.52×10-3μm2；长8储层孔隙度平均值为9.29%；渗透率平均为0.47×10-3μm2,综合评价为低孔低渗储层。长6、长8储层非均质性较强,其中长8储层非均质性强于长6储层。储层孔隙主要以粒间孔为主,其中长8储层的粒间孔较为发育,长6储层主要发育粒间孔,其次是长石溶孔,孔隙为油气的储集提供了有利的空间。叶儿庄地区油藏多发育在三角洲分流河道沉积中心,油藏类型为典型的岩性油藏,其中长8储层中油层较为发育,钻遇率较高。长7烃源岩为本区提供了较为充足的油气,形成上生下储(长8)和上储下生(长6)的储盖组合。长6、长8储层油藏主要受沉积相控制,油藏的成藏模式是由于过剩压力而使得油气在垂向上向上或向下运移,其中长6储层中成藏模式主要为油气通过叠置渗透砂体运移成藏和通过微裂缝运聚成藏两种模式；长8储层油藏成藏模式主要为储层与烃源岩直接接触成藏和油气通过叠置砂体运聚成藏两种模式。
[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.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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