利567井区砂砾岩体储层特征研究

发布时间：2018-06-23 11:26

  本文选题：利567井区 + 成岩作用　； 参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：本次论文在对收集的资料综合分析的基础上,利用岩心、测井、地震、录井等资料并充分运用铸体薄片、普通薄片、扫描电镜等岩矿分析测试技术,主要对利567井区沙四上亚段砂砾岩体储层岩石学特征、成岩作用特征及储层的性质进行了综合的研究。研究区沙四上亚段砂砾岩储层经历了复杂的成岩演化,主要的成岩作用包括压实作用、胶结作用、交代作用以及溶解溶蚀等作用。胶结物的类型主要包括碳酸盐矿物、石英次生加大、黄铁矿以及高岭石、伊利石、绿泥石等粘土矿物。同时根据自生矿物的分布、组合、演化和形成的顺序、粘土矿物的组合以及I/S混层中粘土矿物的转化、岩石中碎屑颗粒的接触关系等特征,研究认为研究区砂砾岩体储层在埋藏过程中经历了早成岩B阶段、中成岩A阶段以及中成岩B阶段。研究区沙四上亚段储层碎屑岩以长石质岩屑砂岩和岩屑质长石砂岩为主,成分成熟度和结构成熟度均较低。孔隙类型既有原生孔隙又有次生孔隙。由于具有次生孔隙发育的各种条件,其粒内溶孔、粒间溶孔、铸模孔等次生孔隙发育。同时根据孔隙度和深度的关系,研究区在2850m~3200m发育在次生孔隙带。储层物性主要受到碎屑成分、原始沉积物的结构、粘土杂基含量、自生矿物含量、成岩作用及沉积相的影响。碎屑颗粒中石英的含量与储层的物性成正相关关系,而岩屑的含量则与储层的物性成负相关关系。原始沉积物结构对储层物性的影响主要表现在粒度中值以及分选性上,通过研究发现分选性越好储层的物性越好,而储层物性随着粒度中值的增加有变好的趋势。储层中粘土杂基含量越高,储层的储集物性越差。在成岩作用方面,压实作用、胶结作用对降低储层的孔隙度,使得物性变差,而溶解溶蚀作用则提高储层的孔隙度,改善储层的物性。同时在不同的沉积亚相中,扇中亚相储层物性较好,是油气储集的良好场所,而扇根以及扇端的储油性能相对较差。在对研究区沙四上亚段砂砾岩体储层“四性”关系的综合研究分析的基础上,本次研究建立了有效储层的判别标准,并对砂砾岩体的有效储层进行了划分。研究结果表明,利567井区沙四上亚段有效储层的物性标准为:岩性标准为砾状砂岩以下(主要为砾状砂岩、含砾砂岩、粗砂岩以及细砂岩),含油标准为油斑以上,储层的孔隙度要大于等于6.5%,渗透率要大于等于0.9×10-3μm2;而有效储层的电性标准为声波时差≥60μs/ft,深感应电阻率≥4.5Ωm。
[Abstract]:On the basis of comprehensive analysis of collected data, this paper makes full use of core, logging, seismic, mud logging and other rock and mineral analysis and testing techniques, such as cast sheet, ordinary slice, scanning electron microscope, etc. The petrological characteristics, diagenesis and reservoir properties of sand-gravel rock reservoirs in the upper submember of Sha 4 in Li567 well area were studied comprehensively. The sandstone and gravel reservoir in the upper part of the study area has undergone complex diagenetic evolution, the main diagenesis includes compaction, cementation, metasomatism and dissolution and so on. The types of cementation mainly include carbonate minerals, quartz secondary augmentation, pyrite, kaolinite, Illite, chlorite and other clay minerals. At the same time, according to the distribution, assemblage, evolution and formation sequence of authigenic minerals, the combination of clay minerals, the transformation of clay minerals in the I / S mixed layer, the contact relationship of clastic particles in rocks, etc. It is considered that the sandstone and gravel reservoir in the study area experienced early diagenesis B stage, middle diagenetic stage A stage and middle diagenetic stage B stage during the burial process. The main clastic rocks in the upper submember of Sha 4 are feldspathic lithic sandstone and lithic feldspathic sandstone with low compositional maturity and structural maturity. Pore types include both primary and secondary pores. Due to various conditions for the development of secondary pores, the secondary pores such as intragranular dissolved pores, intergranular dissolved pores, mold holes, and so on are developed. At the same time, according to the relationship between porosity and depth, the study area developed in the secondary pore zone in 2850m~3200m. The physical properties of reservoirs are mainly affected by clastic composition, structure of primitive sediments, content of clay heterogeneity, contents of authigenic minerals, diagenesis and sedimentary facies. The content of quartz in clastic grain is positively correlated with the physical properties of reservoir, while the content of lithic debris is negatively correlated with the physical property of reservoir. The effect of primary sediment structure on reservoir physical properties is mainly manifested in the grain size median and sorting. It is found that the better the sorting property the better the reservoir physical property and the better the reservoir physical property with the increase of the median particle size. The higher the clay heterogeneity content in the reservoir, the worse the reservoir physical property. In diagenesis, compaction and cementation can decrease the porosity of the reservoir and make the physical property worse, while the dissolution and dissolution can improve the porosity of the reservoir and improve the physical property of the reservoir. At the same time, in different sedimentary subfacies, the reservoir physical property of fan central facies is better, which is a good place for oil and gas reservoir, but the oil storage performance of fan root and fan end is relatively poor. Based on the comprehensive study and analysis of the relationship between the "four properties" of the sand-gravel rock mass reservoir in the upper sub-member of Sha 4 in the study area, the criterion of effective reservoir identification is established and the effective reservoir of the sand-gravel rock mass is divided. The results show that the physical properties of the effective reservoirs in the upper member of Sha-4 in Li567 well area are as follows: the lithologic standard is below the gravel sandstone (mainly gravel sandstone, coarse sandstone and fine sandstone), and the oil content standard is above the oil patch, and the lithologic standard is below the gravel sandstone, the gravelly sandstone, the coarse sandstone and the fine sandstone. The porosity and permeability of the reservoir should be greater than or equal to 6.5 and 0.9 脳 10 ~ (-3) 渭 m ~ (2), while the effective reservoir electrical standard is acoustic moveout 鈮，

本文编号：2056970