苏里格气田苏59区块盒8段与山1段天然气富集规律

发布时间：2018-08-28 15:38

【摘要】：作为典型的致密砂岩气藏,苏里格气田苏59区块的气水关系复杂所导致的气水同产已经成为阻碍该区块增产的主要问题。因此,明确该区气水的分布特征,总结分析该区上古生界的天然气富集规律是该区研究的重点。在前人研究的基础上,结合研究区测井、岩心的数据,确定盒8和山1的两个标志层,并将盒8段细分为盒81,盒82,盒83,盒84四个小层,山1段细分为山1’,山12,山13三个小层。除盒84小层为辫状河三角洲平原沉积外,其它小层均为曲流河三角洲平原沉积。连井剖面上显示,各小层砂体均由多期河道砂体叠置而成,形成了多个向上变细的韵律组合,进而导致了垂向上明显的非均质性。研究区砂体微构造主要包括局部构造高部的鼻状构造、背斜和局部构造低部的向斜、洼槽。微构造对于天然气富集具有—定的影响,具体表现为：构造高部普遍产气,构造低部普遍产水。通过四性关系的研究,建立了盒8段和山1段的泥、砂、砾岩的判定方法,物性与电性的对应关系。同时得出了盒8段和山1段的储层物性下限,盒8孔隙度下限为4%,渗透率下限为0.01mD；对于山1段,渗透率下限为0.01mD,孔隙度下限为2%。同时发现,石英岩屑砂岩普遍粒度偏大,物性偏好,气水分异明显。岩屑砂岩,粒度普遍偏小,物性差,气水分布复杂。运用四性关系研究中建立的判别模型,可以判定岩性和物性,并且通过图版法和全烃气测曲线法来识别气水层,在气水识别的基础上绘制了气水分布图。参考前人研究成果,并综合上面所有的结果,对研究区的天然气富集规律进行了分析得出：研究区天然气的富集主要受到岩性、砂体构造、烃源岩生烃强度、区域构造运动的影响。最后,根据上述富集规律对有利区域进行了预测。
[Abstract]:As a typical tight sandstone gas reservoir, the gas and water coproduction caused by the complex gas-water relationship in Su59 block of Sulige gas field has become the main problem that hinders the increase of production in Su59 block of Sulige gas field. Therefore, it is the key point of the study in this area to make clear the distribution characteristics of gas and water, and to summarize and analyze the natural gas enrichment law of the Upper Paleozoic in this area. On the basis of previous studies, combining well logging and core data in the study area, the two marker layers of Box 8 and Shan 1 are determined, and the section 8 is subdivided into four sub-layers: box 81, Box 82, Box 83, Box 84, and Section 1 is subdivided into Shan 1. Mountain 12, Mountain 13 three sublayers. Except for the braided river delta plain deposit in the box 84 layer, the other sub-layers are all meandering river delta plain deposits. It is shown in the Lian well profile that each small layer sand body is overlaid by multi-stage channel sand bodies, forming multiple upward thinning rhythmic combinations, which leads to obvious heterogeneity in vertical direction. The microstructures of sand bodies in the study area mainly include the nose structure of the high part of the local structure, the anticline and the syncline of the low part of the local structure, the depression trough. The effect of microstructures on natural gas enrichment is as follows: gas production is common in the high part of the structure and water production is common in the lower part of the structure. Based on the study of the four-sex relationship, the determination method of mud, sand and conglomerate, the corresponding relationship between physical properties and electrical properties of member 8 and member 1 of Shanshan are established. At the same time, the lower limit of reservoir physical properties is obtained, the lower limit of porosity of Bo8 is 4 and the lower limit of permeability is 0.01mD. for the first member of Shan, the lower limit of permeability is 0.01mDand the lower limit of porosity is 2. At the same time, it is found that the quartzite sandstone is generally larger in grain size, preference in physical properties and obvious difference in gas and water content. Lithic sandstone, generally small particle size, poor physical properties, gas and water distribution complex. By using the discriminant model established in the study of four-sex relationship, the lithology and physical properties can be determined, and the gas-water layer can be identified by chart method and total hydrocarbon gas measurement curve method, and the gas-water distribution map is drawn on the basis of gas-water identification. Referring to the previous research results and synthesizing all the above results, it is concluded that the enrichment of natural gas in the study area is mainly due to lithology, sandbody structure, hydrocarbon generation intensity of source rock, and so on. The influence of regional tectonic movement. Finally, the favorable regions are predicted according to the above enrichment law.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.13

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