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老君庙油田古近纪L油层组沉积微相研究
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摘要
本文以酒西盆地老君庙背斜带古近纪L油层组为研究对象,运用沉积学、石油地质学、地球物理学等先进理论,以野外露头为基础,结合钻井和测井资料,研究了砂体展布、沉积相和沉积微相特征,系统分析了酒西盆地老君庙油田古近纪L油层组的沉积演化规律以及沉积微相的平面展布特征,讨论了老君庙油田古近纪L油层组成藏因素,明确了油藏控制因素,确定了油藏类型并对其特征进行详细的阐述,同时对有利勘探目标区进行评价。
     在地层划分与对比的基础上,利用岩心以及测井曲线特征将老君庙油田古近纪L油层组划分为河流、三角洲两大沉积体系,并进一步细分为辫状河、三角洲平原和三角洲前缘三种亚相,其中L3发育辫状河沉积,L2主要为三角洲平原沉积,L1为三角洲前缘沉积。
     在明确沉积相以及沉积微相类型的基础上,本文论述了老君庙油田古近纪L油层组沉积体系的时空演化和展布特征、沉积相平面展布以及砂体分布特点,砂体均呈南东—北西向呈条带状展布。老君庙油田古近纪L油层组的岩石类型为石英砂岩和长石岩屑质石英砂岩,胶结物以泥质胶结为主,钙质胶结物含量很少。胶结类型以孔隙型、接触-孔隙型及接触型为主,碎屑颗粒排列为镶嵌-支架状,颗粒之间呈点状接触,说明经受的压实强度较弱,胶结程度中等。
     深入分析了老君庙油田古近纪L油层组的形成机理,油藏类型主要为构造油藏和岩性—构造复合油气藏,其中主要以在沉积体系背景上由构造作用形成的构造油藏为主。油气的运移、聚集和成藏作用以构造运动、断层和沉积相为主控因素,老君庙油田L油层组近酒西盆地生油中心,河道砂坝、三角洲平原分流河道以及三角洲前缘水下分流河道为有利储集相带。结合有利微相的砂体厚度、试油试采数据、孔隙度、渗透率和含油饱和度等指标,对L油层组各个层段的储集砂体的储层物性进行聚类分析,在此基础上对老君庙油田L油层组各油层段进行有利区块预测。
In this paper, Paleogene reservoir L is elected as the object of study, which located in Laojunmiao belt of Jiuxi basin, using advanced theories of sedimentology, petroleum geology and geophysics, based on outcrop, combining with drilling and logging data, researching the characteristics of Sand body distribution,sedimentary facies and sedimentary microfacies, the characyeristics of sedimentary evolution and depositional facies distribution characteristics of the plane of Paleogene reservoir L in laojunmiao belt of Jiuxi basin analysised systematically, discussing the reservior-forming factors of Laojunmiao Oilfield Paleogene L, clearing the main control factors of reservior, definited the reservior type and then making a detailed description to its characters, at the same time making a evaluation of favorable exploration target zones.
     On the basis of the formation divided and constrastion, using core and logging curves, laojunmiao paleogene oilfield can be divided into two big parts,the river depositional system and the delta depositional system, and further subdivided into three sub-facies are braided river, delta plain and the delta, in which L3 developed into braided river deposition, L2 mainly delta plain deposition, L1 the delta front deposition.
     By the clear sedimentary facies and sedimentary microfacies type, this paper discusses the space-time evolution and distribution characteristics of the sedimentary system, the characteristics of sedimentary facies plane and sand body distribution, sand bodies all distributes as a band speard from southeast to northwest. Rock types of Laojunmiao Oilfield Paleogene reservoir L are quartz sandstone and quality quartz feldspar lithic sandstone, cementing material is mainly clay cementation, with seldom calcareous cement. Cement types are mainly pore type, contact-pore type and contact type, debris particles arranged as mosaic-bracket-shaped, grains are contacted point-point, indicating the weak compaction and moderate cementation.
     In-depth analysis the reservior development theories of Laojunmiao oilfield Paleogene L reservior, the reservior types are mainly structural reservoir and lithology-structural composite reservoir, in which the structural reservoir developed by tectonism on the basis of depositional system is the main piont. The migration, accumulation and aggregation of oil and gas are mainly controled by factors of tectonic movement, fault and sedimentary facies, Laojunmiao Oilfield Paleogene reservoir L near the center of Jiuxi basin, river dam, delta plain distributary channel and delta front underwater distributary channel are the favorable reservoir facies. Combing with the sand body thickness of favorable micro-phase, oil-test, drill-test data, porosity, permeability, oil saturation and other indicators, analyzing each layer of the L reservior on the reservior properties of reservior sand body with clustering mothed. On that basis, predicts the favorable zone of each layer in Laojunmiao oilfield L reservior.
引文
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