苏里格气田东区盒8段河流砂体沉积及其非均质性研究

发布时间：2018-01-12 07:06

本文关键词：苏里格气田东区盒8段河流砂体沉积及其非均质性研究　出处：《成都理工大学》2016年博士论文　论文类型：学位论文

【摘要】：苏里格气田东区盒8段属于低孔、低渗、低丰度的以河流相砂体为主的大面积分布的岩性气藏,该区储层埋藏深,厚度相对较薄,夹层发育,气层厚度薄,横向变化快,纵向连通性差,有效储层难以识别,井位优选困难。有效开发这类储层是实现我国天然气稳产、高产的关键所在。论文通过对河流砂体沉积及其非均质性研究,不仅有利于在低孔低渗储层中圈出高孔高渗区,而且对精细地描述探明储量和产能分布及储渗体的分布具有重要意义。论文以沉积学、油气储层地质学、测井地质学、数学地质学等为理论指导,结合测井资料、钻井资料、测试分析资料以及野外露头剖面资料,以苏里格气田东区盒8段为研究靶区,并通过测井相、岩石相研究,确立了研究区沉积相类型,并在次此基础上结合砂体展布特征、剖面特征、砂地比及古水文参数,对研究区河流相时空演化特征进行了研究,并建立了相应的演化模式。在沉积相、成岩作用、孔隙类型和演化及储层物性特征及平面分布的基础上,对研究区储层非均质性进行了研究,并综合分析影响储层非均质性的各种因素,将人工神经网络方法和Logistic回归相融合,对研究区储层非均质性进行了定量刻画,建立了储层非均质性评价数学模型。通过对苏里格气田东区盒8段河流砂体沉积及其非均质性研究,取得了如下成果和认识:(1)结合岩芯观察资料,根据沉积物的粒度、岩性、岩体形态及相互关系和沉积构造类型将研究区下石盒子组的基本岩相划分为16种类型,在此基础上,结合测井相,确立了苏里格气田东区盒8段储层主要沉积相类型为河流相,主要以辫状河沉积体系为主,曲流河和网状河沉积体系次之。(2)在研究区沉积相类型及展布、剖面特征、砂地比统计分析以及河流古水文参数计算(曲率P)基础上,并将砂体空间展布规律与成因分析相结合、河流转化特征与控制因素相结合,由研究区垂向演化序列到同一沉积时期不同地段沉积构型模式,深入探讨研究区河流相转换的演化规律,建立了研究区河流相的演化规律及演化模式。该模式显示研究区盒8段在时间上和平面上均发生河流类型的转化,从西向东由辫状河向曲流河转换,及辫状河夹曲流河河段,曲流河夹辫状河河段,垂向上从盒8下2到盒8上1由辫状河转变为曲流河及网状河。(3)研究区总体为低孔低渗储层,相对高产富集储层主要分布在高能水道沉积的粗岩相带内。该区的储层非均质性强,宏观非均质性受沉积相带控制,高渗透带常顺高能河道发育,呈条带状、土豆状孤立分布。微观非均质性受岩性、成岩作用、孔隙演化的影响。(4)不同的岩石类型以及不同层位的孔隙发育状况明显不同,储集性能也各不相同。石英砂岩、岩屑石英砂岩、岩屑砂岩均以发育残余原生粒间孔(粒间孔)、次生溶孔(粒间溶孔、粒内溶孔)、高岭石晶间孔三类为主,其含量均由石英砂岩→岩屑质石英砂岩→岩屑砂岩逐渐减少。(5)研究区盒8段不同类型砂岩的压汞特征有所不同,石英砂岩的孔喉相对较粗,但分布不均匀;岩屑石英砂岩及岩屑砂岩的孔喉相对较细,但分布相对较均匀。整体上,盒8段砂岩储层孔隙类型和压汞曲线参数还是比较接近,反映出相似的孔隙结构特征。孔隙结构大体可以划分为四种类型:复合型、溶孔-晶间孔型、晶间孔型、微孔型。(6)根据研究区成岩作用特征,结合砂岩孔隙度、渗透率特征,以及压汞曲线特征,将研究区共划分出九种成岩相带:石英加大胶结混合孔隙相、高岭石+石英加大胶结弱溶蚀相、压溶致密相、自生高岭石充填晶间孔相、凝灰质充填微孔相、粘土杂基充填溶蚀相、伊利石胶结交代微孔相、机械压实致密相、钙质胶结交代致密相。(7)综合影响储层非均质性的各种评价因子,将人工神经网络方法和Logistic回归相融合,进行了储层非均质性数学模型研究,计算并获得了研究区盒8上、盒8下储层非均质性评价分类图。研究结果表明:BP神经网络、多项Logistic回归应用广、适用性强,针对储层非均质性评价方法明确、流程简单、用时短、出图快,基于二者的融合评价方法非均质性评价结果比较稳定,适应性更好。
[Abstract]:Sulige gas field in eastern section of box 8 belongs to the low porosity, low permeability, large area of lithologic gas distribution in fluvial sandbody low abundance reservoirs, the reservoirs are deeply buried, relatively thin interlayer, layer thickness, lateral variation, vertical connectivity is poor, it is difficult to identify effective reservoir well, preferably difficult. Effective development of this kind of reservoir is to achieve stable production of natural gas in China, high yield is the key. Based on the study of sedimentary and fluvial sandbody heterogeneity, not only conducive to the low porosity and low permeability reservoir in circle high permeability zone, but also has important significance on the distribution of fine description of proven reserves production and distribution and reservoir. Based on sedimentology, reservoir geology, logging geology, mathematical geology theory, combined with logging data, drilling data, test data and outcrop data, in Sulige gas field He 8 section as the study target, and through the study of well logging facies, facies rocks, the sedimentary facies in the study area, combined with the distribution of sand bodies in time based on this profile, sand ratio and paleo hydrological parameters, fluvial facies in the study area the spatio-temporal evolution characteristics are studied, and established the evolutionary model accordingly. The sedimentary facies, diagenesis, pore evolution and basic types and reservoir characteristics and distribution in the study area, the reservoir heterogeneity is studied, and a comprehensive analysis of the impact of reservoir heterogeneity of the various factors, the artificial neural network method and Logistic regression by fusion of phase. The reservoir heterogeneity quantitatively describe, establish reservoir heterogeneity evaluation mathematical model. Through the research on the deposition of Sulige gas field in Eastern box 8 river sand body and its heterogeneity, has achieved the following results and understanding: (1) combined with the core concept According to the observation data of sediment grain size, lithology, rock mass and the relationship between morphology study and sedimentary structures of Xiashihezi formation of lithofacies are divided into 16 types, based on the combination of logging facies, established the East suligegasfield box 8 reservoir sedimentary facies to fluvial facies, mainly braided the braided river sedimentary system, meandering River and braided river sedimentary system of the second. (2) in the study area, the types of sedimentary facies and distribution, vertical distribution, statistical analysis and river sand than ancient hydrological parameter calculation (curvature P) on the basis of the analysis and the distribution and origin of body space sand combination combination the river transformation characteristics and control factors, the study area vertical evolution sequence to the same sedimentary period in different sections of sedimentary evolution of configuration model, further study area of fluvial facies conversion, established the evolution of the study area and evolution of river facies Mode that show that the study area 8 box river types occurred in time and plane transformation, from west to east from braided to meandering river, braided river and meandering river with river, meandering river with braided river, vertical box from 2 to 8 under the box 8 1 from braided river into a meandering river and braided river. (3) the study area is a low porosity and low permeability reservoir, the relative enrichment of the reservoirs mainly distribute in the high-energy channel deposition of coarse facies zone. The area of the reservoir heterogeneity and heterogeneity controlled by sedimentary facies, high permeability zone Chang Shun high-energy channel development, banded, potato shaped isolated distribution. The micro heterogeneity by lithology, diagenesis, porosity evolution. (4) different rock types and different layers of the pores are obviously different, reservoir properties are also different. Quartz sandstone, lithic quartz sandstone. The hair of lithic sandstone With the residual primary intergranular pore (intergranular pore), secondary pores (intergranular pores, intragranular dissolved pore), kaolinite Shi Jing hole mainly three types, which were composed of quartz sandstone, lithic quartz sandstone and lithic sandstone gradually reduced. (5) the mercury research area of 8 different types of boxes the different characteristics of sandstone, quartz sandstone pore throat is relatively coarse, but uneven distribution of pore throat; the lithic quartz sandstone and lithic sandstone are relatively thin, but the distribution is relatively uniform. On the whole, pore types of sandstone reservoir and pressure curve parameters of 8 section box is still relatively close to, reflect the characteristics of pore structure a similar. The pore structure can be divided into four types: composite type, dissolved pore and intercrystalline pores, intercrystalline pores, pore type. (6) according to the characteristics of diagenesis, with sandstone porosity, permeability, and capillary pressure curve characteristics, the study area is divided into nine kinds diagenetic facies: Stone The increase cement mixed pore facies, kaolinite and quartz overgrowth cementation weak dissolution phase, dense phase pressure solution, filling of authigenic kaolinite intergranular pore facies, tuffaceous pore filling phase, clay matrix filling dissolution facies, illite colloid with generation of microporous phase, mechanical compaction tight facies, calcareous glue making (7 generation dense phase.) the reservoir heterogeneity of various evaluation factors, combining the method of artificial neural network and Logistic regression, the mathematical model of reservoir heterogeneity research, calculation and get the study area box 8, box 8 reservoir heterogeneity evaluation class. The results show that the BP neural network, a number of Logistic the regression of wide application, strong applicability, according to the evaluation method of reservoir heterogeneity is clear, simple process, short time, drawing, evaluation of the combination of the two methods of evaluation results based on heterogeneity is relatively stable, better adaptability.

【学位授予单位】：成都理工大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P618.13

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