梨树断陷金山气田营城组—沙河子组储层特征

发布时间：2018-07-09 12:46

本文选题：梨树断陷 + 金山气田　；参考：《成都理工大学》2017年硕士论文

【摘要】：金山气田位于松辽盆地梨树断陷东南斜坡带最南端,区内长期发育古斜坡背景,是油气长期运移指向区,其主力产层为沙河子组。研究区目的层储层具有埋深大、致密低渗、物性变化快及非均质性强的特点,至今尚未开展系统的储层微观特征研究,导致储层类型、孔隙演化规律及有效储层主控因素不清,严重制约了该地区的勘探开发进程。本论文研究目的层段为营城组和沙河子组。通过岩心观察、测井、录井等资料并结合沉积背景对营城组-沙河子组沉积相进行研究;通过薄片观察、扫描电镜、X衍射分析、恒速压汞等手段对金山地区营城组-沙河子组储层的岩石学特征、孔隙类型及孔喉结构特征、成岩作用特征等进行研究,明确不同种类储层孔喉结构特征、成岩演化序列、孔隙演化规律;综合分析沉积和成岩两方面,确定有效储层发育的主控因素。通过以上研究得出如下结论:(1)营城组-沙河子组主要有十三种岩石相及六种岩相组合类型,对应不同的沉积亚相;沙河子组到营城组为湖盆水体变浅、盆地范围变大,由湖相沉积向陆上三角洲沉积过渡;(2)储层以富中酸性喷出岩和花岗岩等火山岩岩屑的岩屑砂岩、长石岩屑砂岩为主;填隙物以黏土胶结为主;孔隙类主要包括粒间孔、溶蚀孔、少量的砾石贴粒缝和微孔;成岩作用包含压实作用、浊沸石胶结、硅质胶结、碳酸盐胶结及粘土矿物胶结,成岩阶段处于中成岩A、B期。依据成岩作用特征将区内有效储层划分为浊沸石胶结溶蚀砂岩、绿泥石-硅质胶结砂岩及弱压实-弱钙质胶结-溶蚀砂岩3种类型。不同类型储层具有不同的沉积环境、孔喉结构、成岩作用及孔隙演化特征;(3)储层受沉积和成岩控制。刚性颗粒发育的砂砾岩-粗砂岩相储层孔隙发育;营城组分选与物性具有明显正相关性。孔隙度和渗透率不单一受埋深控制,还受岩石组分、成岩作用等多因素综合影响;绿泥石胶结具有双重作用,一方面抵消上覆地层压力,保护原生孔隙,另一方面如果绿泥石膜较厚堵塞分割孔隙,大大降低储层储集性能;溶蚀作用改善储层质量,经溶蚀作用后产生的孔隙平均占孔隙总量的59.1%。综上,通过开展精细的储层微观特征研究,明确有效储层发育的主控因素,将对金山地区下一步油气勘探部署具有重要指导意义。
[Abstract]:Jinshan gas field is located at the southeastern slope of Lish fault depression in Songliao Basin. It has a long history of paleo-slope background and is a long term migration direction area of oil and gas. Its main production layer is Shahezi formation. The reservoir of the target layer in the study area has the characteristics of large buried depth, dense and low permeability, fast change of physical property and strong heterogeneity. So far, no systematic research on the microscopic characteristics of reservoir has been carried out, which leads to unclear reservoir types, rules of pore evolution and main controlling factors of effective reservoir. The process of exploration and development in this area is seriously restricted. In this paper, the target layer is Yingcheng formation and Shahezi formation. The sedimentary facies of Yingcheng formation and Shahezi formation were studied by core observation, logging, logging and sedimentary background. The petrological characteristics, pore types, pore throat structure and diagenesis characteristics of reservoirs of Yingcheng formation and Shahezi formation in Jinshan area were studied by means of constant velocity mercury pressure, and the characteristics of pore throat structure and diagenetic evolution of different types of reservoirs were determined. Pore evolution law, comprehensive analysis of deposition and diagenesis, to determine the effective reservoir development of the main control factors. The conclusions are as follows: (1) there are 13 kinds of lithofacies and six types of lithofacies assemblages, corresponding to different sedimentary subfacies, from Shahezi formation to Yingcheng formation, the lake basin water body is shallower and the basin area is enlarged. The transition from lacustrine facies to land delta deposit; (2) the reservoir is composed of lithic sandstone rich in volcanic rocks such as intermediate-acid exhalation and granite, feldspathic lithic sandstone, clay cementation as the main filling material, intergranular pores, dissolution pores, etc. The diagenesis includes compaction, zeolite cementation, siliceous cementation, carbonate cementation and clay mineral cementation. According to diagenesis characteristics, the effective reservoirs in the area can be divided into three types: zeolite cemented dissolved sandstone, chlorite siliceous cemented sandstone and weakly compact-weakly calcareous cement-dissolved sandstone. Different types of reservoirs have different sedimentary environments, pore throat structure, diagenesis and pore evolution characteristics. (3) reservoirs are controlled by sedimentation and diagenesis. The porosity of sandy gravel and coarse sand facies reservoirs developed with rigid grains, and the separation of Yingcheng formation has obvious positive correlation with physical properties. Porosity and permeability are not only controlled by buried depth, but also influenced by rock composition, diagenesis and other factors. Chlorite cementation plays a dual role, on the one hand, it counteracts overlying formation pressure and protects primary pores. On the other hand, if the chlorite film is thicker to block up and separate the pores, the reservoir performance will be greatly reduced, and the dissolution will improve the reservoir quality, and the porosity resulting from the dissolution will account for 59.1% of the total pore volume. In summary, it is of great significance for the next oil and gas exploration and deployment in Jinshan area to study the microscopic characteristics of reservoir and determine the main controlling factors of effective reservoir development.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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