【作者】 张明禄；

【导师】 曲志浩；

【作者基本信息】 西北大学 ， 矿产普查与勘探， 2004， 博士

【摘要】 针对我国河流相储层砂体普遍分布的特点，以砂体分布描述为中心，开展了地层(砂体)划分、沉积体系、高分辨率层序地层学、地震砂体识别、水平井及修正等时试井资料的分析、储集物性和成岩作用、储层综合评价、砂体的三维可视化表述等一系列的研究，研究了适用于河流相砂岩气藏勘探开发早期气藏描述技术方法，并应用到苏里格气田盒8气藏，分析解剖了苏里格气田盒8气藏的沉积体系，揭示了苏里格气田上古气藏河流相砂体的分布特征。研究中充分体现了地质、测井、地震、测试资料的多学科综合应用，以及多方法的协同验证；广泛使用了地质统计学和模糊优先决策技术，为建立河流相储层砂体分布的地质模型奠定了坚实的基础，研究成果及创新在于： 运用野外剖面和岩心观察、地震反演砂体预测、高分辨层序地层学、测井相识别、岩石实验分析等多学科综合研究方法来确定复杂砂岩储层的沉积相和沉积环境，是一种行之有效的研究方法。运用上述综合研究方法，确认苏里格气田盒8气藏属于河流-冲积平 原沉积体系，否定原来认为的三角洲沉积体系，这一新的相模式对气藏的开发具有重要的指导意义。 针对河流相砂岩气藏砂体高度分散的特点，采用了二维地震资料模糊识别、野外河流滩体考察、三维可视化描述以及钻水平井等多种新技术，成功地识别出河流相砂岩气藏砂体的展布，并首次得出了盒8气藏单砂体的展布模式，为气藏开发的井网布署提供地质依据。 引进了钻水平井和修正等时试井两种高难度的气藏工程技术方法来研究单砂体的 规模。通过对区内苏平1、苏平2两口水平井的近1000米水平井段的钻井录井资料的分析研究，以及对苏6、5、4、10等井的修正等时试井研究，结合野外剖面的观察，得出了本区单砂体和复合砂体的宽度和范围，首次对本区单砂体的宽度和范围进行了量化。 为了形象地观察河流相储层砂体错综复杂的分布状态，探索性进行了基于二维地震资料属性参数基础上的三维可视化描述。三维可视化技术的应用，可以使所建立地质模型更具有直观、立体的视觉，可以更有依据地选择气藏的有利部位，这也是油气藏描述的发展方向。 根据大量的岩芯薄片鉴定，以及使用包体测温、自生石英的氧同位素测定、方解石胶结物的电子探针和同位素分析等先进技术，建立了本区河流相砂岩的孔隙演化定量模型、成岩模式和成岩相，为寻找河流相储层的次生孔隙发育带提供依据。 通过以上综合研究，形成了一套陆上河流相砂岩气藏早期描述的技术方法，对陆上油气藏的勘探开发及西气东输工程具有重要意义。更多还原

【Abstract】 In the light of universal distribution of the fluvial facies gas reservoir sandbody in china , the authors bring forward a reservoir description technique which is suitable to the fluvial facies gas reservoir and apply it to the He8 gas reservoir in SuLiGe gas field by taken sandstone distribution as a center through a series researches of stratigraphic division, sedimentary system, high resolution sequence stratigraphy, seismic sandbody recognition, analyzing the data of horizontal well and modified isochronous testing, reservoir physical property and diagenesis,early-stage reservoir comprehensive evaluation, 3D visualization of sandstone etc.The sedimentary system and sandbody distribution of He8 gas reservoir are analyzed. It is fully embodied by the mutual verification of multi-methods and multi-discipline integrated application of geology, logging, seismic, testing data etc. Geological statistics and fuzzy prior decision technique are widely used to establish the geology model of sandbody distribution of the fluvial reservoirs.Some results and innovation of the paper as fellows:Firstly, the sedimentary facies and sedimentary environment of complex sandstone reservoir are confirmed by synthesizing multi- discipline such as analyzing field sections and cores, seismic inversion , high-resolution sequence stratigraphy, well logging facies identification, rock lab analysis etc. Using the above methods, it is confirmed that the He8 gas pool is fluvial-alluvial plain sedimentary system instead of delta sedimentary system which was previously regarded. The new facies model is an important guidance to the exploitation of the gas pool.Secondly, In the light of strongly dispersed distribution of the fluvial facies gas reservoir sandstone, the authors succeed in identifying the sandstone distribution rule and firstly identifying the single sandstone distribution model of He8 gas reservoir and providing the geologic basis for arranging well pattern to the exploitation of gas reservoir by using 2D seismic fuzzy recognition technique, field fluvial beach observation, 3D visualization and drilling horizontal well technique.Thirdly, the size of single sandbody is studied by introduction of two sophisticated gas pool engineering techniques 梔rilling horizontal well and modified isochronous testing. By analyzing about 1000m horizontal sections log data of well SuPingl and well SuPing2, modified isochronous testing of well Su4, Su5, Su6, SulO, and observation of the field sections, the width and range of single sandbody and complex sandbodys are ascertain.Fourthly, in order to display the complex distribution of fluvial sandbody vividly, the authors carry through the 3D visualization description technique based on the 2D seismic data. By using the technique, the established geologic model would be more intuitionistic, more solidand more easily to select the favorable parts of gas reservoir.Fifthly, using advanced technology, such as identifying core slices, temperature measurement of inclosure, oxygen isotopes detection of autogenic quartz, electron probe detection of calcite cement and so on, the quantitative model of porosity evolution, diagenesis pattern and facies are established to offer a reference for finding secondary develop zone in the area.In a word, the early-stage reservoir description technique which is suitable to the fluvial facies gas reservoir is of great importance to the exploitation of gas pool onshore and the western gas to east transmission project.更多还原