渝东南牛蹄塘组富有机质页岩沉积与储层特征

发布时间：2018-03-28 16:36

  本文选题：渝东南　切入点：牛蹄塘组　出处：《成都理工大学》2017年硕士论文

【摘要】：本论文以渝东南地区牛蹄塘组富有机质页岩为研究对象,以沉积学与储层地质学理论为指导,充分利用野外露头剖面资料、钻井岩芯资料、测试分析资料,对渝东南牛蹄塘组富有机质页岩沉积与储层发育特征进行了研究,并对储层有利区进行了评价。论文主要取得了如下的成果和认识。依据岩石类型、沉积构造、岩相变化等相标志,对牛蹄塘组富有机质页岩进行沉积相和层序的划分。渝东南牛蹄塘组为陆棚沉积,可进一步划分为浅水陆棚、深水陆棚;根据岩性上的差异划分为炭质、硅质、钙质-砂质陆棚微相,根据岩性变化,微相叠置关系划分为两个三级层序。在上述基础上,详细论述了牛蹄塘组沉积相在垂向上的演化和空间上的展布。详细研究了牛蹄塘组富有机质页岩的储集性,牛蹄塘组储层空间为层间孔、粒间孔、粒内溶孔和有机质孔和裂缝5种类型;孔隙度分布在0.1%~2%之间,平均为0.98%;渗透率为(0.0001~0.015)×10~(-3)μm~2,平均为0.072×10~(-3)μm~2。深入分析了富有机质页岩的有机地化特征。地球化学分析数据显示牛蹄塘组有机质丰度高,TOC值普遍大于2%,平面上高值区集中于秀山-酉阳一带,往北西方向TOC含量降低;总体热演化程度高,Ro平均值为3.13%,处于过成熟阶段。综合国内页岩气评价标准与重庆地区富有机质页岩的评价异同点,通过对各评价参数的叠合,将牛蹄塘组页岩气有利区界定为埋深500~4500m之间,有效厚度约30~90m,TOC含量于1.5~4.5%之间,地表条件相对较好的区带,并划分出页岩气Ⅰ类有利区和Ⅱ类远景区各1个。
[Abstract]:Based on the theory of sedimentology and reservoir geology, this paper takes the rich organic shale of Niutetang formation in southeastern Chongqing as the research object, makes full use of outcrop profile data, drilling core data, and test and analysis data. The characteristics of organic matter rich shale deposition and reservoir development in Niulitang formation in southeastern Chongqing were studied, and the favorable reservoir areas were evaluated. The sedimentary facies and sequence of organic matter rich shale of Niulitang formation are divided into sedimentary facies and sequence. The Niutetang formation in southeastern Chongqing is continental shelf deposit, which can be further divided into shallow water shelf and deep water shelf, and is divided into carbonaceous according to the difference of lithology. The microfacies of siliceous, calcareous and sandy shelf are divided into two third-order sequences according to lithologic changes. The evolution and spatial distribution of sedimentary facies in Niulitang formation are discussed in detail, and the reservoir properties of organic shale rich in Niulitang formation are studied in detail. The reservoir space of Niulitang formation is interlayer pore and intergranular pore. There are five types of dissolved pore and organic pore and fracture, the porosity is between 0.1% and 2%. The average value is 0.98; the permeability is 0.0001 ~ 0.015) 脳 10 ~ (-3) 渭 m ~ (-2), and the average is 0.072 脳 10 ~ (-3) 渭 m ~ (-2). The organic geochemistry characteristics of organic shale are deeply analyzed. The geochemical analysis data show that the high organic matter abundance of Niulitang formation is generally greater than 2, and the high value area on the plane is concentrated in Xiushan-Youyang area. The content of TOC in northwestward direction is decreased, the average value of total thermal evolution is 3.13%, which is in the over-mature stage. According to the similarities and differences between the domestic shale gas evaluation standard and the evaluation of organic matter rich shale in Chongqing area, the superposition of the evaluation parameters is obtained. The favorable area of shale gas in Niulitang formation is defined as a zone with a buried depth of 500 ~ 4500m, an effective thickness of 30 ~ 90m ~ (-1) and a TOC content of 1.5 ~ 4.5%, with relatively good surface conditions, and a favorable area of shale gas class I and a region of type 鈪，

本文编号：1677146