【作者】 王莹；

【导师】 侯中健；

【作者基本信息】 成都理工大学 ， 沉积学， 2009， 硕士

【摘要】 辽河坳陷海外河油田海26块是海外河油田主力断块,构造位置在辽河断陷盆地中央隆起带南部倾没带的南端,是中央隆起带南部倾没端上的一个次级隆起,属翘倾断块复式油气聚集带。本文是在充分借鉴前人研究的基础上,以地质学、层序地层学等基础理论为指导和技术手段,基于对工区内地质背景分析的基础上,充分利用收集到生产井的地震、测井、录井数据进行分析,对海26块区的层序地层特征及储层特征进行了系统的分析研究。针对本工区的东营组,进行了地质背景分析,介绍了本区东营组岩层的发育状况,按照油田的层组划分标准,如“驼峰状”含粉砂质泥岩,该标志层发育在东营组顶部,与馆陶组呈不整合接触,是馆陶组与东营组的分界;“锯齿状”低阻泥岩,在D2顶部,是D1与D2分界标志;“夹鼻状”低阻泥岩,位于东三段顶部,是D2与D3分界标志,岩性为灰绿色泥岩夹粉砂岩、泥质粉砂岩组合;“V”形泥岩,发育在D2-1的上部,岩性为灰绿色泥岩,视电阻率曲线和感应曲线都呈“V”字形;“w”形泥岩,位于D2-2底部,是D2-2与D2-3的分界标志,岩性为灰绿色泥岩夹薄层泥质粉砂岩。结合测井资料,对本区东营组进行了层序地层学的研究,其中包括对层序界面的识别与描述,以及各层序特点的描述。海26块区东营组可分出4个三级层序界面(SB1～4)和7个四级层序界面(SB11～SB32),在此基础上对其中的层序界面与层序进行了研究。采用高分辨率层序地层学的研究方法,识别出3个长期层序(LSC1～LSC3)与10个中期层序(MSC1～MSC10),并通过综合柱状图、连井图建立了本地区东营组的层序地层格架。在古生物、泥岩颜色、岩石相类型及沉积结构构造特征、电性曲线特征、粒度特征的分析基础上对本地区东营组的沉积相及亚相、微相进行了划分,认为海26块东营组主要为三角洲沉积体系,亚相又可以分为三角洲平原、三角洲前缘、前三角洲亚相,微相方面则广泛发育水下分流河道微相、河口砂坝微相、水下分流间微相、湖泥微相。并对沉积微相的平面展布、沉积演变规律、砂体发育特征进行了研究。最后,建立了断陷的演化模式。根据岩芯观察和粒度资料统计,对海26块储层砂体岩性中的岩石成分成熟度、胶结物含量、胶结类型、结构特征进行了描述。通过X—衍射等资料统计分析得出了储层的粘土矿物特征,利用砂体特征、物性特征得出了不同沉积微相与物性变化的关系,表现为:a.水下分流河道微相储层物性较好,是高孔隙、高渗透性储层;b.水下分流间砂体发育较差,储层物性也较水下分流河道差。并且对储层的非均质性、储层的孔隙结构特征进行了研究。更多还原

【Abstract】 Liaohe depression Hai26-section is main block of Hai wai he oil field, construction location is in the south of Liaohe faulted’s central uplift, which is a sub-uplift. It’s a composite form’s oil and gas accumulation zone.This article is fully draw on the basis of previous studies, use geology, sequence stratigraphy, and other basic theory as guidance and technical means, based on regional geological background analysis. Make full use of collected seismic, logging, logging data of production wells to analysis. Research on Hai26-section’s characteristics of sequence stratigraphy and reservoir characteristics systematically. For the work area of Dongying formation, do the analysis of the geological background, introduced the development situation of Dongying formation. In accordance with the field criteria for the classification of the layer group, such as the "hump-shaped" silty mudstone, layer of the sign at the top of the development in the Dongying, contact with Guantao Formation unconformity, which is Guantao Formation and Dongying Formation’s boundaries; "Jagged" low resistance mudstone, at the top of D2, which is D1 and D2’s boundaries; "Folder nose" low resistance mudstone, at the top of D3,which is D2 and D3’s boundaries, lithology is composition of gray green mudstone with siltstone and pelitic siltstone.“V”mudstone, at the top of D2-1, lithology is gray green mudstone, apparent resistivity curves and curves of both sensors "V"-shaped; "W"-shaped mudstone, at the botton of D2-2,which is D2-2 and D2-3’S boundaries, lithology is composition of gray green mudstone with thin pelitic siltstone. In combination with logging data, research on sequence stratigraphy of Dongying Formation, including the identification and description of sequence- interface, as well as a description of the characteristics of each sequence.Hai26-section Dongying Formation four third-order sequence interface(SB1～4) and seven forth-order sequence(SB11～SB32) can be divided, and, we studied the sequence interface and sequence. Use two-tiered sequence’s approach, divide "T-R" sequence, identify three long-term sequence (LSC1 ~ LSC3) and 10 mid-term sequence (MSC1 ~ MSC10),and through the integrated histogram and multi-well figure,we established Dongying Formation sequence stratigraphic framework in the region.On the basis of analysing paleontology, mudstone color, and sedimentary rocks of the type of structure characteristics, electrical characteristics curves, particle size, we divided the area of Dongying Formation’s sedimentary facies and subfacies, microfacies. Hai26-section Dongying Formation is mainly delta depositional system, subfacies can be divided into delta plain, delta front and The former delta subfacies. Extensive develop micro-phase underwater distributary channel, estuary microfacies dams, diverting water between the micro-phase, lake mud microfacies. And studied the flat sedimentary microfacies distribution, sedimentary evolution, and development characteristics of sand bodies. Finally, established a model of rift evolution.According to observation core data and statistics particle size. Describes the Hai26-section reservoir sand body’s rock compositional maturity, cement content, cement type, structural features. Through X-ray diffraction data analysis, etc, come to the reservoir characteristics of the clay minerals, the use of sand body characteristics, characteristics of properties, come to a different sedimentary microfacies and the relationship between changes in physical properties. The performance of the following: a. Subaqueous distributary channel reservoir microfacies, better physical properties, high porosity, high permeability reservoir; b. Sandbody between subaqueous poorly developed,reservoir properties are worse than the underwater distributary channel. And studied the heterogeneity of the reservoir and the reservoir pore structure.更多还原