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涠洲11-4N油田始新统流沙港组一段油藏精细描述
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摘要
本文将成熟的油藏描述技术引入新区油气勘探早期阶段,针对涠洲11-4N油藏的地质特点和测试成果,综合应用各种勘探开发资料,以石油地质学、现代沉积学、储层地质学、开发地质学和油藏工程等学科理论为指导,运用高分辨率层序地层学、高分辨率地震地层学、三维地质建模、油藏数值模拟等现代油藏描述技术和方法,以计算机技术为手段,对涠洲11-4N流一段油藏进行了精细描述研究,提出了相应的合理开发模式。
     论文在涠西南凹陷构造形成和演化分析研究的基础上,利用三维地震、钻井等资料对该区流一段油藏进行了构造精细研究,建立了三维精细构造模型,编制了各小层的三维构造图,搞清了区内构造的分布特征和断层的发育分布规律。在前人研究的基础上,通过岩芯观察、沉积背景和沉积特征分析,进行了储层沉积微相研究,认为该区主要是扇三角洲相带,沉积微相主要有辫状主河道、河道侧翼相、分支河道相、近端前缘砂、远端前缘砂等。运用高分辨层序地层学的原理和方法,建立了研究区的层序地层格架,在骨架剖面对比的基础上,将流一段层系划分为6个短期基准面旋回,8个小层,为储层的精细描述奠定了基础。分析研究区成岩作用,利用岩心观察、薄片、粒度、常规物性等多种方法对研究区储层进行评价分析研究。压实作用、胶结作用严重影响了储层的储集性能,溶蚀作用对储层孔隙度有很大贡献,云母等碎屑矿物的蚀变作用使非均质性加强,孔隙结构复杂,储集性能降低。应用沉积、测井、地震反演方法建立小层属性确定性模型,在建立了储层原型模型后,优选随机模拟方法对储层进行随机模拟,建立储层预测模型和进行油藏数值模拟。提出了合理开发本区油藏的层系划分,井网、井距,开发方式和注水时机以及注水量及合理的开发方案部署,对下一步油藏开发效果,稳产和提高采收率有重要的指导意义,可供同类油藏的开发借鉴。
Introducing the mature reservoir description technology into the early time stage of the newly oil-gas exploration area,in view of the reservoir's geological character and the test results of WZ11-4N,applying various kinds of exploration and development materials,taking discipline theories of the petroleum geology,modern sedimentology,reservoir geology,development geology,reservoir engineering and so on as guidance,,making use of modern reservoir description technologies of high resolution sequence stratigraphy,high resolution seismic stratigraphy,three-dimensional geologic model building,numerical reservoir simulation and so on,and taking the computer technology as method,this thesis conducts a fine description research of the L1 member of WZ11-4N and proposes the corresponding reasonable development.
     Based on the analysis of the hollow structural formation and evolution in the southwest WeiZhou island,making use of materials of 3D seismics,well drilling and so on,this thesis conducts a fine description of the reservoir of Liul member in this area,establishes three-dimensional fine structural model and structural map to the various subzones,and clarifies the distributed character of the structure in this area and the growth distributed rule of the fault step by step.Based on the previous researches,through observation of the core and analysis of depositional setting and the deposition character,the present research studies the the sedimentary microfacies of the reservoir and holds that this area was mainly the fan delta facies belt and that the microfacies are mainly braided channel facies,channel flank facies,branch channel facies,proximal frontal sands,distal frontal sands and so on.Utilizing the principle and the method of high resolution sequence stratigraphy,the present research establishes the sequence formation skeleton in research area.Based on the contrasting of the skeleton section,the present research divides Liul member into 6 short-term basal level cycles and 8 subzones,which lays a foundation for the fine description of reservoir. This thesis analyzes the diagenesis and conducts the appraisal analytical study of this area reservoir by making use of many kinds of methods such as the core observation,the thin slice,the granularity,the convention natural and so on.The compaction function and the cementation greatly influence the reservoir's accumulation performance;the corrosion function has contributed greatly to the reservoir porosity;the alteration function of detrital minerals such as mica strengthens the anisotropism, makes the pore structure complex and reduces the accumulation performance.Applying the methods of the deposition,the well logging and the earthquake inversion,the present research establishes subzone attribute deterministic model;after establishing the reservoir prototype model,by choosing the optimal random simulations method,the random simulations of the reservoir has been carried and the reservoir forecast model has been established and the numerical reservoir simulation has been carried.This thesis proposes the reasonable development plans which includes formation division,well pattern,well spacing,the development way and the timing of water injectionas as well as the water injection rate,which is significant as a guidance for the reservoir development,stable production and recovery enhancement and serves as reference to the similar reservoir as well.
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