马岭地区延长组长8段沉积相特征及储层综合评价

发布时间：2018-02-12 02:08

  本文关键词： 沉积相特征 储层综合评价 长8油层组 马岭地区 鄂尔多斯盆地　出处：《成都理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：马岭地区是长庆油田近年来于鄂尔多斯盆地西南部中生界发现的一个油田,区域上位于鄂尔多斯盆地伊陕斜坡的西南部,三叠系延长组长8油层组作为主力产层。本文以众多前人研究成果为基础,通过现场调查、岩芯观察和测井资料、测试分析资料相结合,宏观分析与微观研究相结合,理论应用于生产实际相结合,在对马岭地区长8段油层组地层、沉积相及砂体展布研究的基础上,对储层特征等进行重点的研究,探讨储层发育主控因素以及对研究区建立储层综合评价。通过上述研究过程,本文在以下方面取的了一些研究成果和认识:在长庆油田延长组长8油层组地层划分方案基础上,综合分析研究区典型钻井长8油层组不同层段沉积相、微相特征,并进行井间沉积相对比研究。认为长8油层组沉积时,研究区主要受控于西部物源;通过三角洲发育背景及相标志分析,认为研究区主要发育浅水三角洲沉积体系。通过对研究区的储集砂体展布特征及成因类型分析,认为储集砂体横向摆动大、平面上呈条带状、网状沿南西~北东向、近西~东向展布,连片性较好。其中,水下分流河道砂体及河口坝砂体是油气赋存的最有利储集砂体类型。结合薄片、岩心等分析化验资料表明,马岭地区长8储层岩性特征表现为以岩屑长石砂岩、长石岩屑砂岩为主,岩屑、长石含量较高,成分成熟度、结构成熟度均较低;成岩作用主要包括压实作用、胶结作用和溶蚀作用;从岩心物性分析统计结果得知,研究区大面积低渗背景上,发育了高渗高产区(甜点)。长8储层总体表现为相对低孔低渗,在整体低渗的背景下,局部存在相对高渗区。研究区长8储层发育的控制因素主要为三个方面:沉积相带、岩性特征、成岩作用。其中沉积相带的影响体现在长8砂体随湖岸线迁移幅度较大,不同其次砂体变化迅速,导致形成浅水三角洲坨状砂体局部较厚,储层物性变化较快的特征。根据石油行业延长组储层评价标准,结合前面对沉积相和砂体以及储层的岩石学特征、孔隙类型、孔隙结构、物性特征研究等,建立本区的储层分类评价标准,并对储层进行了分类评价,以Ⅰ、Ⅱ类储层为主。
[Abstract]:The Maling area is an oil field discovered in the Mesozoic in the southwest of Ordos Basin in recent years in Changqing Oilfield. It is located in the southwest of the Yishan slope in the Ordos Basin. Yanchang formation 8 of the Triassic Yanchang formation is the main reservoir. Based on many previous research results, this paper combines the field investigation, core observation and logging data, test and analysis data, macro analysis and micro research. On the basis of the study of formation, sedimentary facies and sand body distribution of Chang 8 formation in Maling area, the reservoir characteristics are mainly studied. The main controlling factors of reservoir development and the establishment of comprehensive evaluation of reservoir in the study area are discussed. Through the above research process, some research results and understandings are obtained in the following aspects: on the basis of the stratigraphic division scheme of Chang 8 formation in Changqing Oilfield, Yanchang formation, Changqing Oilfield. The sedimentary facies and microfacies of different formations of typical Chang 8 oil formation in the study area are comprehensively analyzed, and the cross-well sedimentary facies are compared. It is considered that the study area is mainly controlled by the western provenance when the Chang 8 oil formation is deposited. Based on the analysis of the development background and facies marker of the delta, it is considered that the shallow water delta sedimentary system is mainly developed in the study area. By analyzing the distribution characteristics and genetic types of the reservoir sand bodies, it is concluded that the lateral swinging of the reservoir sand bodies is large. On the plane, it is striped, the mesh is distributed in the direction of NW to NE, the near west to east, and the continuity is good. Among them, the underwater distributary channel sand body and the estuarine bar sand body are the most favorable reservoir sand bodies for oil and gas accumulation. The core analysis data show that the lithologic characteristics of Chang 8 reservoir in Maling area are characterized by lithic feldspar sandstone, feldspathic sandstone, high lithic and feldspar content, low compositional maturity and low structural maturity. Diagenesis mainly includes compaction, cementation and dissolution. Under the background of overall low permeability, there is a relatively high permeability area. The main factors controlling the development of Chang 8 reservoir in the study area are three aspects: sedimentary facies zone, lithologic characteristics, Diagenesis. The influence of sedimentary facies zone is reflected in the large migration range of Chang 8 sand body with the lacustrine line, and the rapid change of different secondary sand bodies, which results in the formation of shallow water deltaic lump sand bodies with thicker parts. According to the reservoir evaluation criteria of Yanchang formation in petroleum industry, combined with previous studies on petrological characteristics, pore types, pore structure, physical properties of sedimentary facies, sand bodies and reservoirs, The criteria of reservoir classification and evaluation in this area are established, and the classification and evaluation of reservoirs are carried out, mainly in class 鈪，

本文编号：1504542