鄂尔多斯盆地南部渭北地区延长组长7、长6及长3储层特征研究
发布时间：2018-08-17 16:32
【摘要】：本文综合应用了沉积学、储层沉积学及石油地质学等理论知识和方法,在前人研究的基础上,通过岩芯观察、测井资料解释、室内薄片观察及扫描电镜、压汞测试等多种测试分析手段,对渭北地区上三叠统延长组长7、长6及长3油层组的沉积相和储层特征及储层主控因素进行了较深入的研究。研究区长7、长6及长3油层组主要为辫状河三角洲沉积体系和湖泊体系,并进一步分为三类亚相,八种微相。区内储集砂体主要为三角洲前缘水下分流河道、河口坝及浅湖砂坝。水下分流河道砂体储层物性最好,次为河口坝,水下分流间湾、浅湖泥及半深湖泥储层物性最差。研究区长7、长6及长3油层组砂岩的结构成熟度和成分成熟都较低,以岩屑长石砂岩、长石岩屑砂岩为主,孔隙类型主要为原生粒间孔、长石及岩屑粒内溶孔、粒间溶孔。砂岩的分选较好,中值半径较小,属细孔-微喉型,略偏粗歪度。成岩作用类型主要有压实(溶)作用、胶结作用、溶蚀作用和交代作用,研究区主要处于晚成岩A期。通过薄片观察、扫描电镜分析及沉积、成岩作用的研究明确提出了沉积作用是影响储层物性好坏的基础,而成岩作用是控制区内砂岩储层原生孔隙保存和次生孔隙发育的主要因素,其中压实(溶)作用和胶结作用是降低储层储集性能的重要因素,溶解作用则形成大量次生孔隙,有效地改善了砂岩储层的物性。经过综合分析和评价,可将长7、长6及长3储层分为四类,其中Ⅰ类储层物性最好,Ⅱ类储层物性稍差于Ⅰ类储层,依次类推,Ⅳ类储层物性最差。Ⅰ类、Ⅱ类储层在建庄-四郎庙-腰坪一线发育,Ⅲ类储层在偏桥镇及其周边发育,Ⅱ+Ⅲ类储层存在于宜君县以南区域。
[Abstract]:In this paper, the theory and methods of sedimentology, reservoir sedimentology and petroleum geology are synthetically applied. On the basis of previous studies, core observation, log data interpretation, laboratory sheet observation and scanning electron microscope are used. In this paper, the sedimentary facies, reservoir characteristics and main reservoir control factors of Chang 7, Chang 6 and Chang 3 reservoirs of Upper Triassic Yanchang formation in Weibei area were studied by means of mercury injection test and other testing and analysis methods. The Chang 7, Chang 6 and Chang 3 reservoirs in the study area are mainly composed of braided river delta sedimentary system and lake system, and are further divided into three subfacies and eight microfacies. The reservoir sand bodies are mainly delta front underwater distributary channel, estuarine dam and shallow lake bar. The reservoir physical properties of underwater distributary channel sand body is the best, followed by estuarine dam, underwater distributary bay, shallow lake mud and semi-deep lake mud reservoir. The structure maturity and composition maturity of sandstone of Chang 7, Chang 6 and Chang 3 oil formations in the study area are low. The main types of sandstone are lithic feldspar sandstone, feldspar lithic sandstone, primary intergranular pore, feldspar and lithic intragranular dissolved pore and intergranular dissolved pore. The separation of sandstone is better, the median radius is smaller, it belongs to fine pore-microlarynx type, slightly coarse skewness. The main types of diagenesis are compaction (dissolution), cementation, dissolution and metasomatism. Through thin slice observation, scanning electron microscope analysis, deposition and diagenesis, it is clearly pointed out that sedimentation is the basis of influencing reservoir physical properties. Diagenesis is the main factor for the preservation of primary pores and the development of secondary pores in sandstone reservoirs in the controlled area. Compaction (dissolution) and cementation are important factors to reduce reservoir performance, while dissolution forms a large number of secondary pores. The physical properties of sandstone reservoir are improved effectively. Through comprehensive analysis and evaluation, Chang 7, Chang 6 and Chang 3 reservoirs can be divided into four categories. Among them, type 鈪，
本文编号：2188236
[Abstract]:In this paper, the theory and methods of sedimentology, reservoir sedimentology and petroleum geology are synthetically applied. On the basis of previous studies, core observation, log data interpretation, laboratory sheet observation and scanning electron microscope are used. In this paper, the sedimentary facies, reservoir characteristics and main reservoir control factors of Chang 7, Chang 6 and Chang 3 reservoirs of Upper Triassic Yanchang formation in Weibei area were studied by means of mercury injection test and other testing and analysis methods. The Chang 7, Chang 6 and Chang 3 reservoirs in the study area are mainly composed of braided river delta sedimentary system and lake system, and are further divided into three subfacies and eight microfacies. The reservoir sand bodies are mainly delta front underwater distributary channel, estuarine dam and shallow lake bar. The reservoir physical properties of underwater distributary channel sand body is the best, followed by estuarine dam, underwater distributary bay, shallow lake mud and semi-deep lake mud reservoir. The structure maturity and composition maturity of sandstone of Chang 7, Chang 6 and Chang 3 oil formations in the study area are low. The main types of sandstone are lithic feldspar sandstone, feldspar lithic sandstone, primary intergranular pore, feldspar and lithic intragranular dissolved pore and intergranular dissolved pore. The separation of sandstone is better, the median radius is smaller, it belongs to fine pore-microlarynx type, slightly coarse skewness. The main types of diagenesis are compaction (dissolution), cementation, dissolution and metasomatism. Through thin slice observation, scanning electron microscope analysis, deposition and diagenesis, it is clearly pointed out that sedimentation is the basis of influencing reservoir physical properties. Diagenesis is the main factor for the preservation of primary pores and the development of secondary pores in sandstone reservoirs in the controlled area. Compaction (dissolution) and cementation are important factors to reduce reservoir performance, while dissolution forms a large number of secondary pores. The physical properties of sandstone reservoir are improved effectively. Through comprehensive analysis and evaluation, Chang 7, Chang 6 and Chang 3 reservoirs can be divided into four categories. Among them, type 鈪，
本文编号：2188236
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