【作者】 武春英；

【导师】 李勇；

【作者基本信息】 长安大学 ， 古生物学与地层学， 2007， 硕士

【摘要】 本文综合应用沉积学、石油地质学、储层地质学等理论和方法,通过野外剖面观察、钻井岩心观察、测井资料解释、薄片鉴定、扫描电镜和储层岩性物性分析等手段,对英旺探区延长组的沉积相及储层特征进行了较为深入的研究。研究区长8地层沉积体系类型主要为三角洲沉积体系和湖泊沉积体系。三角洲水下分流河道是长8油气储集的骨架砂体,砂体的发育完全受控于沉积相的展布,均呈北东一南西方向条带状展布。英旺探区延长组砂岩主要为岩屑长石细砂岩和长石细砂岩,主要胶结物为绿泥石膜、方解石和自生石英。成岩作用主要为压实作用、胶结作用和溶蚀作用,成岩作用普遍进入晚成岩A期—晚成岩B期。研究区主要孔隙类型为残余粒间孔、溶蚀粒间孔和粒内溶蚀孔。长8砂岩孔喉组合为小孔中细喉型、小孔细喉型和细孔微细喉型,孔隙度平均为6.93%,渗透率平均为0.65×10^-3μm²,储集体为低孔、低渗储层。英旺探区延长组储层性质主要受控于构造作用、沉积相和成岩作用三大因素。研究区地质结构简单,构造平缓,构造运动对储层物性影响有限;延长组砂岩具有粒径细、成分成熟度低和结构成熟度高的特点,这决定其物性较差;再者延长组储层经历了较长时间和较高强度的压实与胶结作用,且裂缝也不发育。由此可见,研究区是典型的低孔特低渗储集岩。参照前人的分类标准并综合分析英旺探区储层物性特征,将本区储层划分为四类,其中长8有少量属于Ⅳ类储层,多数属于Ⅲ类储层。通过油藏控制因素和油气富集规律分析,认为英旺探区延长组具有利的生储盖组合和良好的油气圈闭条件。综合产能特征和测井资料在英旺探区延长组长8³、长8²两个含油层位优选出三类油气有利区块,为下一步勘探开发提供地质依据。更多还原

【Abstract】 Applied with outcrop observation, core description, geophysical logging interpretation, thin section determination, Scanning Electron Microscope,reservoir lithology and physical property analysis and other analytic machinery,the sedimentary facies and micro-characteristic of Yanchang Formation in Yingwang exploration area are studied deeply.Sedimentary systems of the Chang8 in Yingwang exploration area can be divided into delta and lacustrine facies.Subaquous distributary channel in delta front microfacies is identified, which is the main reservoir sand bodies for oil and gas of Chang 8.The distribution of sand bodies distributed from northeast to southwest are dominated by sedimentary facies.Feldspar-lithic fine-sandstone and feldspar fine-sandstone are mainly sandstone of Yanchang Formation in Yingwang exploration area,and its diagenetic mineral includes chlorite films,calcite and autogeny-quartz etc. The diagensis is mainly compaction ,cementation and dissolution.All the sandstones have entered A period of late diagentic and B period of late diagentic stage.The main pore types are remnant intergranular porosity,intergranular dissolution porosity and intragrnular dissolution porosity.Chang 8 pore textures are 6.93%.The average porosits is 0.65×10^-3μm². So Chang 8 is low-pore and low-permeability reservoir.Reservoir properties are mainly controlled by tectonics, sedimentary facies and diagenesis. Because of simple configuration,gentle structure,the effect of the tectonic movement is relatively limited.The reservoir sandstone of Yangchang Formation has the characteristics of fine grain size,low compositional maturity and high textural maturity,determining the physical property of sandstone is bad.The reservoir of Yangchang Formation experienced longer and stronger compaction and cementation,and its fissure is undeveloped.In summary, reservoir sandstone of Chang 8 in the area is typical of low porosity and low permeability.By looking for sand body and higher pore and higher permeability area, combined with oil product characteristic and electromotive curve data, three advantageous blocks of oil are predicted of different oi-bearing beds of Yanchang Formation in Yingwang exploration area, which provide the credibility geology gist for further exploration and exploitation in this area.更多还原