徐南肇州区块沙河子组沉积、储层特征研究

发布时间：2019-01-02 09:46

【摘要】：本次研究遵循层序地层学理论,从钻井揭示的地层岩性资料入手,运用测井录井方法辅助,以地震不整合、上下超截识别为主“井-震结合”的研究方式将徐家围子南部沙河子组划分为由下至上SQ1至SQ1共4个三级层序。通过岩心观察、粒度分析、测井相分析、地震反射特征分析等研究方法,对徐家围子南部沙河子组沉积相标志进行了总结,在此基础之上,由单井沉积相分析结合研究区层序地层格架控制认为研究区的沉积相类型主要包括扇三角洲、辫状河三角洲、湖泊相,其中扇三角洲发育在徐西断裂控制的西部陡坡带,辫状河三角洲发育在东部缓坡带。对徐家围子南部沙河子组储层物性、薄片、扫描电镜以及压汞实验资料的分析,认为沙河子组致密砂岩层岩性主要为岩屑质长石砂岩和长石质岩屑砂岩,钙质胶结物与泥质杂基构成主体填隙物,储集空间类型为“少见原生孔、多见次生孔、可见微裂缝、偶见晶间孔”的特征。有效储层的因素可以归结为“沉积主控、压实主导、胶结增密、溶蚀添孔、裂缝改渗”,压实作用和胶结作用通过减小孔隙空间及填充喉道对储层物性起破坏作用;溶蚀作用通过产生次生溶孔对储层物性起建设作用;构造活动产生的微裂缝对储层渗透率起改善作用。平面上,西部扇三角洲前缘亚相为最有利储层发育区,东部辫状河三角洲前缘亚相次之。由于徐家围子南部沙河子组实测物性数据较少,从测井拟合物性数据出发,结合综合解释成果,分别统计徐家围子南部沙河子组气层和干层的物性数据,采用分布函数曲线法分别求取气层的孔隙度和渗透率的下限值,认为徐家围子南部沙河子组气层孔隙度下限为3.5%,渗透率物性下限值为0.053mD。
[Abstract]:This study follows sequence stratigraphy theory, starting with the lithologic data revealed by drilling, using logging method to assist, and using seismic unconformity. The Shahezi formation in the south of Xujiaweizi is divided into four third-order sequences from SQ1 to SQ1 in the south of Xujiaweizi. By means of core observation, grain size analysis, logging facies analysis and seismic reflection characteristics analysis, the sedimentary facies markers of Shahezi formation in the southern part of Xujiaweizi are summarized, and on the basis of these, the sedimentary facies of Shahezi formation in the south of Xujiaweizi are summarized. Based on the single-well sedimentary facies analysis and sequence stratigraphic framework control in the study area, it is considered that the sedimentary facies types in the study area mainly include fan delta, braided river delta, lacustrine facies, among which fan delta is developed in the western steep slope zone controlled by Xuxi fault. Braided river delta developed in the eastern gentle slope zone. Based on the analysis of reservoir physical properties, thin slices, scanning electron microscope and mercury injection experiment data of Shahezi formation in the south of Xujiaweizi, it is concluded that the lithology of tight sandstone in Shahezi formation is mainly lithic feldspathic sandstone and feldspathic lithoclastic sandstone. Calcareous cementation and muddy heterogeneity constitute the main interstitial material. The reservoir space is characterized by "rare primary pore, mostly secondary pore, microfracture and occasionally intergranular pore". The effective reservoir factors can be summed up as "sedimentary control, compaction leading, cementation increasing, corrosion and porosity, fracture and permeability", compaction and cementation can destroy reservoir physical properties by reducing pore space and filling throat. Dissolution plays a constructive role in reservoir physical properties through the formation of secondary dissolved pores, and microfractures produced by tectonic activity can improve reservoir permeability. On the plane, the front subfacies of the western fan delta is the most favorable reservoir development area, followed by the braided river delta front subfacies in the east. Because the physical property data of Shahezi formation in the south of Xujiaweizi are few, the physical property data of gas reservoir and dry layer of Shahezi formation in the south of Xujiaweizi are counted according to the well fitting physical property data and the comprehensive interpretation results. By using the distribution function curve method, the lower limit values of porosity and permeability of gas reservoir are obtained, and it is considered that the lower limit of porosity and permeability of Shahezi formation in the south of Xujiaweizi is 3.5mD and 0.053mDrespectively.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【二级参考文献】