延长油区延131-延319井区山西组沉积微相与储层地质特征研究

发布时间：2018-04-26 17:17

本文选题：延131-延319井区 + 上古生界　；参考：《西安石油大学》2015年硕士论文

【摘要】：本文针对延131-延319井区地层的划分与对比、沉积相类型与演化规律、储层特征和气藏特征对该区进行气藏描述研究,得到如下结论:(1)对延131-延319井区二叠系下统含气地层进行了划分,将下石盒子组划分为盒5-盒8四个段、山西组又细分为山1段、山2两段。盒8段、山1段、山2段与石炭系本溪组为本区的主要产气层位。(2)对延131-延319井区构造特征进行了研究,盒8段、山1段、山2段及本溪组气藏在构造上处于平缓的西倾单斜,倾角为1°左右,地层内鼻状构造相对不发育。(3)延131-延319井区盒8段、山1段、山2段气层组属于三角洲前缘水下分流河道砂体与河口坝沉积,沉积微相主要为水下分流河道砂岩沉积与分流间湾粉砂岩泥岩沉积;本溪组属于海相障壁岛潮坪沉积。(4)该地区上古生界主要目的层段砂岩岩心分析样品的统计结果表明,储层孔隙度主要在0.1%~20.0%之间,渗透率在0.01mD~10.0mD之间。渗透率的变化主要受孔隙发育程度的控制,渗透率与孔隙度呈正相关系,且各层段气藏储层孔候结构差异对渗透率起决定性作用;样品的孔隙度和渗透率均偏向低值的一侧,平均孔隙度小于4.98%,平均渗透率小于1.1 mD,属低孔、低渗致密型储集层。(5)本区盒8段、山1段、山2段及本溪组气层天然气干燥系数为0.99,天然气组份中不含H2S气体,属无硫干气;研究区盒8段、山1段、山2段及本溪组气层水为弱酸性(PH平均值为5.36),水型为为CaCl2型(苏林分类)。地层水的总矿化度为12.94-210.09g/L,平均矿化度为69.86g/L。(6)根据目的层段气藏储层展布特征以气水分布及较强的非均质性,气藏以甜点的形态分布,结合储层物性致密的特征,认为本区气藏类型属于“准连续型致密砂岩气藏”。
[Abstract]:In this paper, the stratigraphic classification and correlation, sedimentary facies type and evolution law, reservoir characteristics and gas reservoir characteristics of Yan131-Yan319 well area are studied. The conclusion is as follows: (1) the Lower Permian gas-bearing strata of Yan131-Yen319 well area are divided into four member of Xiashihezi formation: Bo-5- Bo-8, and the Shanxi formation is subdivided into Shan 1 and Shan 2. The structural characteristics of Yan131-Yan319 well area are studied. The gas reservoirs of Bo8 member, Shan 1 member, Shan 2 member and Benxi formation of Benxi formation are structurally flat westward monoclinal. The dip angle is about 1 掳, and the nasal structure in the strata is relatively undeveloped. The formation of gas reservoirs in the Yan131-Yan319 well area, member 8, member 1 and member 2 belong to the delta front subaqueous distributary channel sand body and estuarine dam deposits. The sedimentary microfacies are mainly subaqueous distributary channel sandstones and interdistributary siltstone deposits, and Benxi formation belongs to marine barrier island, the tidal flat sediment. 4) the statistical results of sandstone core analysis of the main target member of Upper Paleozoic in this area show that, The porosity of reservoir is mainly between 0.1% and 20.0%, and the permeability is between 0.01mD~10.0mD. The change of permeability is mainly controlled by the degree of pore development, the permeability is positively related to porosity, and the difference of pore structure of gas reservoir in each section plays a decisive role in permeability, the porosity and permeability of the sample are both inclined to the side of low value. The average porosity is less than 4.98 and the average permeability is less than 1.1 mD. it belongs to low porosity and low permeability tight reservoir. In the study area, the average pH of gas bed water in the study area is 5.36 (5.36), and the type of water is CaCl2 (Sulin classification) in the gas bed water of Bo8, Shan 1, Shan 2 and Benxi formation. The total salinity of formation water is 12.94-210.09 g / L, and the average salinity is 69.86 g / L 路L ~ (-6). According to the gas and water distribution and strong heterogeneity of the gas reservoir in the target formation, the reservoir is distributed in the form of desserts and combined with the characteristics of tight physical properties of the reservoir. It is considered that the gas reservoir in this area belongs to "quasi-continuous tight sandstone gas reservoir".
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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