大牛地气田山2段致密砂岩气层评价

发布时间：2018-02-24 10:11

  本文关键词： 山2段 “四性”关系 测井 致密砂岩气层 分类评价　出处：《成都理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：大牛地气田属于非均质性很强的致密砂岩气藏,位于鄂尔多斯盆地东北部塔巴庙地区,构造部位处于伊陕斜坡上,构造平缓,砂岩储层致密,且断层不发育。山西期沉积环境属入湖辫状河三角洲平原沉积,不同时期砂体迁移较为明显,储层纵横向非均质性较强,随着勘探开发程度的增加,动用程度日益增加,动用难度日益增大,因此对于砂岩储层特征的详细评价显得尤为重要。本文旨在以前人前期储层评价与油气识别方法及技术攻关的为基础,对山2段储层的“四性”关系进行分析与研究,利用气田积累的大量岩芯、测井、录井资料,描述储层气藏基础地质特征,并结合气层开发特征,建立合理的分级评价标准,对大牛地山西组山2段气层进行综合评价,明确产层下限,并对储层进行分级评价,弄清山2段各小层气层的平面分布特征。根据现场22口井的取心资料的描述以及384个砂岩薄片和铸体薄片的观察研究,本区山2段的砂岩类型以石英岩屑砂岩、岩屑石英砂岩为主,成岩作用复杂,孔隙类型多样,以原生剩余孔隙、次生溶蚀孔隙为主要的孔隙类型。山2段孔隙度主值区间在2%~8%,单峰主要在4%~8%内,约占总体的45%,孔隙度约为6.49%。从渗透率来看,渗透率最大值达到0.48×10-3μm 2,最小0.1×10-3um2。并结合岩压汞资料分析认为山2段多出现Ⅱ、Ⅲ类气层,岩性多以中-细粒砂岩为主,砂岩孔隙结构特征属于分选中等~较差,结构较差。在储层特征分析的基础上,对山2段80余口井的“四性”关系进行研究发现,(1)从岩电关系来看,山2段优质气层由于泥质含量稍高,容易发生井壁不稳定而破坏的情况,声波曲线出现周波跳跃,导致解释孔渗不准确。(2)从岩性-物性的关系来看,山2段沉积能量总体偏低,优质砂体占比较低,储层沉积形成的岩石学特征变化不足以导致孔隙物性的变化。(3)从物性-含气性特征来看,在成藏组合中,山西组属于源内成藏组合,在源内成藏组合中,运移通道和气源条件的影响更为微弱,受物性影响较为明显,这也造成了山2段物性分布较为集中且差,因此总体与含气性关系不明显。在“四性”关系研究的基础上,建立了泥质、孔隙度、渗透率、含气饱和度的测井解释模型。并进一步对气层进行评价,通过综合评价和测井响应-孔渗的拟合等手段确立山2段储层物性下限为孔隙度5%,渗透率分别为为0.14×10-3μm 2,建立了气层分级评价的标准:Ⅰ类气层—孔隙度和渗透率不低于7%,0.3×10-3μm2,含气饱和度大于65%,属于高产区;Ⅱ类气层标准—孔隙度7%~10%,渗透率(0.3~1)×10-3μm 2,含气饱和度55%~70%,属于中产区;Ⅲ类气层标准—孔隙度和渗透率低于8%,0.6×10-3μm 2,含气饱和度小于65%,属于低产区;Ⅳ类气层标准—孔隙度小于5%,渗透率小于0.14×10-3μm 2,含气饱和度低于50%。大牛地山西组山2段的稳产气层多发育于砂体稳定分布的地区,厚度较大的地层,横向连续性较好,S2-1的Ⅰ类气层基本均散布在中西部,分为1-1-35、1-3-7、1-1-68、1-2-9、1-2-10五口井附近,Ⅱ类气层在大12、大15井区范围分布相对集中,Ⅲ类气层在大47井区和大66井区、大4井区零星分布,可以看出分布范围受砂体控制明显,平面非均质性极强,气层侧向连续性差,在2-5km范围具有一定对比性。S2-2相比S2-1气层分布,Ⅱ类气层分布范围更大,Ⅰ类气层主要有东北大55、中部大13、西南1-4-27、1-4-17这四个范围,Ⅱ类气层约占Ⅲ类气层的一半,主要分布在南北向的河道内,分为中部-西部的大44-大16-大31-大38-大开14一线和中北-中南部的大28-大32-大8-大13-大22-大61一线,西南部的大77和大84井附近,Ⅲ类气层除西北大90井区、东北大57井区、西南大74井、大121、大63井附近以外,其他区域分布范围与Ⅱ类气层基本一致,平面非均质性仍较强,其内存在大量物性和岩性封隔带。
[Abstract]:Daniudi gas field belongs to the high heterogeneity of tight sandstone gas reservoir, located in the northeast of Ordos in Tabamiao area, construction site in Yishan slope, gentle structure, tight sandstone reservoir, and faults are not developed. Shanxi period sedimentary environment into the lake belongs to braided river delta plain sedimentary sand bodies in different periods of migration obviously, horizontal reservoir heterogeneity, with the increase of exploration degree, development degree is increasing, with increasing difficulty, so for a detailed evaluation of sandstone reservoir characteristics is very important. This paper aims at the previous stage of oil and gas reservoir evaluation and identification methods and technology research based on the mountain 2 reservoir "four" relationship analysis and research, a large number of cores, the accumulation of gas logging, logging data, reservoir description and geological characteristics of gas reservoirs, combined with the development characteristics of gas layer, set up Reasonable grading evaluation criteria, comprehensive evaluation of Daniudi Shanxi group Shan 2 gas reservoir, clear reservoir limit, and classification and evaluation of reservoir, the plane distribution of clear mountain 2 segments of each small layer reservoir. According to the core data description of 22 wells and 384 pieces of thin sandstone and casting slice observation, the 2 section of the mountain type quartz sandstone lithic sandstone, lithic quartz sandstone, complex diagenesis, pore types, native residual pore, secondary pores are the main pore types. The main value of Shan 2 porosity in the range of 2%~8%, the main peak in 4%~8%, ca. accounted for 45% of the total, the porosity is about 6.49%. from the point of view of permeability, permeability reached the maximum value of 0.48 * 10-3 M 2, a minimum of 0.1 * 10-3um2. and in combination with the mercury data analysis that Shan 2 more II, class III reservoir, lithology in fine grained sandstone, sandstone The pore structure characteristics belonging to the sorting medium is poor, poor structure. On the basis of analyzing reservoir characteristics, on the mountain 2 section of more than 80 wells "four" the relationship between the study found that (1) from the rock electricity relation, Shan 2 reservoir quality because the clay content is slightly higher, not prone to the wall stable and destroyed, acoustic curve frequency hopping, resulting in inaccurate interpretation of porosity and permeability. (2) the relationship between lithologic properties, Shan 2 energy deposition is generally low, high quality sand body is relatively low, the change of reservoir sedimentary petrology formation is not enough to cause changes in pore properties. (3) from the gas - characteristics, in reservoir combination, Shanxi group belongs to the source reservoir combination within source reservoir combination, influence the migration channel and source condition is more weak, the physical effects are more obvious, this is caused by the physical distribution is Shan 2 the concentration and the poor, so the total Relationship between the body and the gas content is not obvious. In the "four basic research" on the relation established mud, porosity, permeability, gas saturation interpretation model. And further evaluation of the reservoir, through the comprehensive evaluation and well logging response - porosity and permeability of the fitting is used to establish 2 mountain reservoir for the lower limit of porosity is 5%, permeability were 0.14 * 10-3 M 2, to establish the gas grade evaluation standard: class I - reservoir porosity and permeability of not less than 7%, 0.3 * 10-3 m2, the gas saturation is greater than 65%, which belongs to the high yield region; class II reservoir porosity permeability standard - 7%~10% (0.3~1) * 10-3 M 2, gas saturation 55%~70%, belonging to the middle class III reservoir area; standard porosity and permeability is less than 8%, 0.6 x 10-3 M 2, gas saturation is less than 65%, belong to the low yield area; IV standard gas - less than 5% porosity, permeability less than 0.14 * 10-3 M 2 gas full And below 50%. Daniudi Shanxi mountain group yield 2 section of the reservoir sand body developed in the stable distribution area, large thickness, good lateral continuity, the basic S2-1 class I reservoir are scattered in the Midwest, divided into five wells near 1-1-35,1-3-7,1-1-68,1-2-9,1-2-10, class II reservoirs in the big 12, the distribution range of 15 well area is relatively concentrated, class III reservoir in 47 wells and 66 wells, 4 wells scattered, we can see that the distribution scope of sand control, plane strong heterogeneity, reservoir lateral continuity is poor, in the range of 2-5km with contrast.S2-2 compared to S2-1 gas distribution, the distribution range of type of gas is larger, class I reservoir mainly northeast 55, middle 13, southwest of the four 1-4-27,1-4-17 range, class II gas accounts for about half of class III reservoir, mainly distributed in the north and south of the river, is divided into 44- 16- 31- in Central - western 38- open the South and north of the big 14 line - 28- 32- 13- Da 8- Da Da 22- Da line 61, 77 and 84 wells near the southwest, class III reservoir in addition to the northwest 90 well area, northeast 57 well area, southwest 74 wells, 121, near the outside 63 well, other regional distribution and class II reservoirs are basically the same, plane heterogeneity is still strong, the existence of a large number of physical property and lithology sealing belt.

【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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