梨树断陷十屋油田营城组储层砂岩成岩作用及物性特征研究

发布时间：2018-06-06 09:17

本文选题：十屋油田 + 营城组　；参考：《吉林大学》2015年硕士论文

【摘要】：十屋油田位于梨树断陷北部，其丰富的油气物质基础和众多的沉积体系构成的多样化的复合圈闭，使其具有良好的找油气前景。十屋油田以往的勘探开发工作主要分布在中浅层，随着勘探程度的加深，深部层位越来越受到重视。但在实际工作过程中，该区的油气潜力一直未得到最大的发掘。营城组作为梨树断陷深部良好的储盖层组合，更是得到广大学者的关注。本文应用偏光显微镜、扫描电镜、铸体薄片分析和X-射线衍射等技术方法和手段，结合砂岩物性特征数据，对营城组砂岩进行系统的岩石学研究、成岩作用研究和储层物性特征研究，并分析了影响砂岩物性特征的因素。十屋油田营城组四个砂组（K1yc1、K1yc2、K1yc3、K1yc4）发育的砂岩主要为岩屑长石砂岩和长石岩屑砂岩，还有少量的长石砂岩、岩屑砂岩和火山凝灰岩。碎屑物均以石英、长石和火山岩屑为主，填隙物普遍含量相对较少，胶结物以钙质胶结物和硅质胶结物为主。营城组砂岩经历了复杂的成岩作用改造，其中机械压实作用和压溶作用表现明显，造成颗粒紧密堆积，，致使粒间孔不发育；胶结作用强烈，胶结物类型多，胶结期次复杂，严重影响储层的孔隙特征；溶解作用主要发生在长石和岩屑颗粒的边缘和内部，形成了次生孔隙，对储层物性有着积极的改造作用；蚀变作用主要发生在长石和岩屑中，但是蚀变程度普遍偏低。在经历了复杂的成岩作用之后，营城组砂岩成岩阶段达到了中成岩阶段A-B期。营城组四个砂组储层砂岩发育的孔隙类型主要有扩大粒间孔、粒内溶孔和铸模孔；砂岩面孔率偏低，多数属低级别，孔隙直径相对较小，大部分属于小级别孔径，喉道宽度多属中喉级别，起到了很好的连通作用。储层类型主要为低孔-特低孔—特低渗-中渗型储层，中央构造带小五家子以北SN17-SN203-SN201-SN165-SW103-SW6一带为有利区块。成岩作用中的机械压实作用、溶解作用和交代蚀变作用，对砂岩的储层物性特征有着重要的影响。浅部受机械压实作用影响明显，表现为随深度的增加，孔隙度和渗透率降低；深部受溶解作用影响，形成次生孔隙，使孔隙度和渗透率有所提高。
[Abstract]:Shiwu Oilfield is located in the northern part of Lishu fault depression. Its rich oil and gas material foundation and multiple sedimentary systems make it have a good prospect for oil and gas exploration. The exploration and development work in Shiwu Oilfield was mainly distributed in the middle and shallow strata in the past. With the deepening of exploration degree, more and more attention has been paid to the deep layer. However, the oil and gas potential in this area has not been maximized in the actual working process. Yingcheng formation, as a good reservoir and caprock assemblage in the deep part of Lish fault depression, has been paid more attention by many scholars. In this paper, a systematic petrological study of the Yingcheng formation sandstone is carried out by means of polarizing microscope, scanning electron microscope, thin slice analysis of cast body and X-ray diffraction, combined with the physical property data of sandstone. Diagenesis and reservoir physical characteristics are studied, and the factors affecting sandstone physical characteristics are analyzed. The sandstones developed in the four sand formations of Yingcheng formation, Shiwu Oilfield are mainly lithic feldspathic sandstone and feldspathic sandstone, as well as a small amount of feldspathic sandstone, lithic sandstone and volcanic tuff. The clastic materials are mainly quartz feldspar and volcanic debris and the content of interstitial matter is relatively small and the cementation is mainly composed of calcareous cement and siliceous cementation. The sandstone of Yingcheng formation has undergone complex diagenesis transformation, in which mechanical compaction and pressure dissolution are obvious, resulting in tight accumulation of particles, resulting in undeveloped intergranular pores, strong cementation, many types of cementation, and complex cementation period. The dissolution occurs mainly in the edge and interior of feldspar and lithic grains, forming secondary pores, which have a positive effect on reservoir physical properties, and alteration occurs mainly in feldspar and lithic debris. However, the degree of alteration is generally low. After complicated diagenesis, the diagenetic stage of Yingcheng formation reached A-B stage. The pore types of sandstone in the four sand formation reservoirs of Yingcheng formation are mainly expanded intergranular pore, intragranular dissolved pore and mold pore, and the sandstone porosity is low, most of them belong to low grade, the pore diameter is relatively small, and most of them belong to small pore size. The width of laryngeal tract belongs to the level of middle larynx, which plays a good role in connecting. The reservoir types are mainly low porosity, very low permeability and medium permeability reservoirs, and favorable blocks are located in the SN17-SN203-SN201-SN165-SW103-SW6 area north of Xiaowujiazi in the central structural belt. The mechanical compaction dissolution and metasomatism in diagenesis play an important role in the reservoir physical properties of sandstone. The shallow part is obviously affected by mechanical compaction, which shows that the porosity and permeability decrease with the increase of depth, and the deep part is affected by dissolution, forming secondary porosity, which increases porosity and permeability.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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