【作者】 雷霄雨；

【导师】 侯中健；

【作者基本信息】 成都理工大学 ， 沉积学， 2010， 硕士

【摘要】 辽河西部凹陷西斜坡是斜坡型复式油气聚集带,西部凹陷地区作为辽河油田的重点探区,具有十分优越的石油地质条件。为了油田的稳产与滚动扩边,针对本区构造条件复杂、储层非均质程度高、侧向相变快的特点,加强沉积微相及储层特征研究。本学位论文以沉积学、储层沉积学、测井地质学等理论为指导,充分利用研究区钻井资料、岩心资料、测井曲线、测试分析资料,对研究区沙河街组莲花油层进行了系统的地层划分与对比,通过沉积特征、岩电特征等深入研究了齐108块莲花油层组沉积体系类型及特征并建立相应的相模式,同时,详细探讨了储集砂体的成因类型及展布特征。对沉积相和储层特征进行了较为系统和全面的研究,并有了更加深入的认识。研究表明:研究区莲花油层组属于扇三角洲沉积体系,主要发育扇三角洲前缘亚相的水下分流河道、分流间湾、河口坝、前缘席状砂沉积微相。在各沉积微相中,以扇三角洲前缘水下分流河道与河口坝砂体孔喉大、储层物性好,孔隙结构类型组合以高渗、大孔、中—粗喉道为主,是好储层,前缘席状砂体是较差的储层,分流间湾的泥质砂岩是非储层。各种岩性中,以细砂岩的储集物性较好,粉砂岩物性较差,其中细砂岩为研究区内主要的储层岩性类型。砂体的发育受沉积相控制,呈北西一南东向扇状展布。通过储层岩石学特征、物性特征、孔隙结构类型等方面的研究,对研究区莲花油层组储层特征进行了研究,结果表明:研究区莲花油层组具有低成分成熟度和低结构成熟度的特点,主要岩石类型为岩屑长石砂岩。储集层性能受沉积相和成岩作用控制明显,以水下分流河道砂体储集性能最好。根据物性参数及孔隙结构特征,将研究区莲花油层组储集砂体分为五类,其中Ⅰ类为较好储层,Ⅱ、Ⅲ、Ⅳ类为较差储层。最后研究了各油层组的储集砂体成因类型及展布规律,为该区石油勘探提供依据。更多还原

【Abstract】 Liao he western depression is the typical down slope oil-gas accumulation zone. As the chief exploration area of Liao he oilfield, Liao he western depression has a great petroleum geologic potential. As preliminary studies lack the understanding of the geological conditions in this area, this area of exploration would be adversely affected. In order to keep production, according to the complex tectonic conditions, high reservoir heterogeneity degree, fast phase change of this area, Strengthening the sedimentary facies and reservoir characteristics of micro-studies, is the guide and important basis for the next step and prerequisite of oil and gas exploration in the area.This thesis is based on sedimentology and reservoir sedimentary, logging geology, making full use of the study area well drilling data, drill core data, bore log data、test analysis data, carrying out a systematic stratigraphic division and correlation in the study area of Lian hua reservoir. By analyzing sedimentary characteristics, rock electricity characteristics,deeply studied the sedimentary system type and characteristics in Qi108 Lianhua oil group, at the same time established the corresponding facies model,carrying out a systematic study on sedimentary facies and reservoir characteristics. At the same time, detailedly discussed genetic types and distribution characteristics of reservoir sand. Then attain a more in-depth understanding.Research shows: Lianhua reservoir group in the study area belongs to fan-delta depositional system, and developing fan delta front subfacies underwater distributary channel, the mouth bar, front thin sand microfacies. In various sedimentary microfacies fan-delta front underwater distributary channel and mouth bar has the characters of pore throat big, good reservoir properties, pore structure type of combination to high permeability, the main characters are megaporosity, medium - wide throat, which belongs to a good reservoir, while front sheet sand and segregation between the thin reservoir sand is a poor, sandy mud between the diversion of non-reservoir rock.The reservoir physical property of underwater distributary channel and mouthbar sands in delta front is better in all kinds of sedimentary micro-facies, that of distal bar and shallow lake sand bars is poor, in all kinds of lithology, The reservoir physicalproperty of fine sandstone is better, that of siltstones is poor, and fine sandstone is the main reservoir lithologic types in the studied area.Development of sand bodies are controlled by sedimentary facies, showing a NW-SE fan-shaped cloth. By studying the petrological character, physical property character, pore structure types. the study area Lian hua reservoir Characteristics of reservoir has been studied,the result identifies that Lian hua reservoir group in the study area has low compositional maturity and low textural maturity characters. The main rock type is lithic arkose. Reservoir performance is controlled by sedimentary facies and diagenetic clearly, the underwater distributary channel sand reservoir is the best one. According to physical parameters and pore structure characteristics of the study area, Lian hua oil Formation sandstone reservoir is divided into five categories: classⅠis a better reservoir, classⅡ,Ⅲ,Ⅳo f poor reservoir. The final study is group of each reservoir reservoir sand body distribution rule, with the purpose of providing an important basis for the further oil exploration and deployment in the area.更多还原