【作者】 曾忠玉；

【导师】 陈发景；

【作者基本信息】 中国地质大学（北京） ， 矿产普查与勘探， 2011， 博士

【摘要】 论文针对蠡县斜坡北段沙河街组砂泥岩薄互层油藏难识别的特点,利用研究区地震、钻井、测井等资料,以石油地质学、层序地层学、沉积学等理论为指导,采用地震和地质一体化综合研究手段,对研究区构造特征、沉积体系和储层特征、油气聚集进行综合研究,寻找有利储层和油气聚集的有利区带。采用先进的技术进行三维保幅宽频高分辨率处理,提高了地震资料的分辨率和波组信息丰富度。利用多种方法精细标定,储层二级精细标定和连井对比标定,在构造解析指导下进行全三维解释,分析构造样式和构造特征。利用层序地层学理论和技术方法,建立等时地层格架,沙河街组可划分为七个四级层序,SQ7相当于沙一下段,对应湖浸体系域,发育沙一下尾砂岩有利砂体;SQ6相当于沙二段,对应低位体系域;SQ5相当于沙三上亚段,对应高位体系域,发育Es₃Ⅰ砂组和Es₃Ⅱ砂组有利砂体。研究区以辫状河三角洲水下分流河道砂体最为发育。沙一下亚段主要储集体为水下分流河道砂体和滩坝砂体,砂体在平面上呈椭圆状连片分布,由多期的朵状砂体叠加而成;沙三上亚段主要储集体在研究区形成四个水下分流河道砂体,河道砂体呈北西-东南向条带状分布。研究区储层为低渗储层,综合地震、测井、地质等资料,利用储层特征反演可有效地预测储层的岩性和物性的分布特征,反演的自然电位拟波阻抗数据体能够反映渗透性砂岩的分布特征。研究区砂岩孔隙以次生孔隙为主,表现为粒间溶孔、粒内溶孔、铸模孔,溶解作用是改善研究区储层孔渗性的最重要的成岩作用。Es₁^下为中孔低渗透储层,Es₃ ^上为低孔低渗透储层。研究区沙河街组发育三套生储盖组合,油气运移主要通过骨架砂体、断层及裂缝、不整合界面以及复合输导体系向蠡县斜坡方向运移,构造和砂体分布对油气富集起着良好的控制作用。综合构造、沉积相和砂体分布等成果,结合油气聚集规律,圈定有利区带。更多还原

【Abstract】 Aiming to the difficulties in identifying reservoirs of sand-shale thin interbed of Shahejie Formation in northern Lixian Slope, based on seismic, drilling and logging data of the study area, and relevant theories like petroleum geology, sequence stratigraphy, sedimentology, etc., by using seismogeological integrative comprehensive research methods, this thesis does comprehensive studies on structural features, sedimentary systems, reservoir features, petroleum accumulation for identifying favorable reservoirs and target areas.By applying advanced technology in amplitude preservation and broadband processing with high resolution for 3D seismic data, the resolution and abundance of wave group data has been approved. Fine calibration, secondary fine calibration and well-tie comparison calibration have been conducted by applying various methods, and full-3D interpretation is done by using structural analysis theory, structural style and trap features.By applying sequence stratigraphy theory and technical methods, I establish an isochronal formation framework. As a result, the Shahejie Formation is divided into 7 fourth-order sequences: SQ7, or lower Sha-1 Member, corresponds to Lacustrine transgressive system tract and develops favorable sandbody of tail sandstone in lower Sha-1 Member; SQ6, or Sha-2 Member, corresponds to lowstand system tract; SQ5, or upper Sha-3 Submember, corresponds to highstand system tract and develops Es₃I sandgroup and Es₃II sandgroup which are favorable sandbodies.The sandbodies in underwater distributary channel of the braided stream delta are the most developed in this area. The major reservoir of lower Sha-1 submember is underwater distributary channel sandbody and beach-bar sandbody which are distributed in elliptic jointly in plane and formed by superimposition of multiple-phase lobate sandbodies; the major reservoirs of upper Sha-3 submember develop four underwater distributary channel sandbodies in the study area which distribute in a NW-ES banded shape.Due to reservoirs in this area are low-permeability reservoir, the lithology and physical property distribution of reservoir can be effectively predicted through applying reservoir feature inversion based on seismic, logging and geologic data. The pseudo-wave impedance data volume of self-potential can sensitively reflect the distribution feature of permeable sandstone.Pores of sandstones in this area dominated by secondary pores, characterized by intergranular dissolved pore, intragranular dissolved pore and moldic pore. Dissolution is the most important diagenesis for improving the porosity and permeability of reservoirs in this area. The moderate-porosity and low-permeability reservoirs are developed the lower part of Es₁ and the low-porosity and low-permeability reservoirs are developed in the upper part of Es₃.In this area, Shahejie Formation develops three suits of generation-reservoir -caprock assemblages, and the hydrocarbon migrates to Lixian slope through frame -sand bodies, faults, fractures, unconformity surface and composite carrier beds system. Distribution of structures and sandbody has good control over the petroleum accumulation. Based on distribution of structures, sedimentary phases and sandbodies, as well as reservoir accumulation rules, favorable regions have been delineated.更多还原