鄂尔多斯盆地延长地区山西组储层特征及气藏主控因素研究

发布时间：2018-06-20 02:26

  本文选题：陕北斜坡 + 延长气田　； 参考：《西北大学》2015年硕士论文

【摘要】：鄂尔多斯盆地上古生界气藏为“广覆式”生烃、“大面积”成藏的低渗、致密、低压、岩性气藏。在整个鄂尔多斯盆地“广覆式”生烃、“大面积”成藏及盖层广泛发育的背景下,储层发育特征成为气藏勘探的关键研究内容。研究区位于鄂尔多斯盆地陕北斜坡东南部的延长气田东部,面积1200km2。前期勘探研究初步掌握了气藏发育的目标层系,但在气藏非均质性极强的条件下,对有效储层分布特征的认识尚不够明确。另外,对气藏储层测井解释模型、高效储层展布特征、天然气富集主控因素及富集规律、有利勘探区预测标准等基础研究工作相对比较薄弱,因此,在一定程度上影响了气田后续高效勘探及规模开发。本文以研究区上古生界二叠系山西组储层为研究目标,以盆地演化、沉积背景等前人研究成果为基础,通过基础地质研究及气藏特征研究建立气藏分布与储层发育及气藏压力等参数之间的耦合关系,探讨气藏的富集规律主攻方向。通过钻井、取心、分析测试、测井、录井等资料开展储层岩性特征、物性特征、孔隙结构、孔隙类型、储层成岩作用研究,完成了储层岩电关系研究并建立储层物性测井解释模型；通过天然气成藏基础地质条件分析、气藏发育特征及生产实际数据对比研究,探讨了研究区上古生界山西组天然气成藏主控因素分析,建立气藏勘探开发有利区预测标准,完成气田后续勘探开发有利目标区及接替区预测,为气田后续勘探研究提供理论支持和技术积累。在气藏圈闭类型研究的基础上,通过气藏分布与储层展布特征、储层物性平面分布特征及气藏压力等参数之间的耦合关系研究发现,储层厚度和孔隙度成为气藏富集成藏的主控因素,在孔隙度达6%以上的储层中,储层厚度与气藏单井产量呈正比例关系。与整个气田以山23(S23)作为主力产层不同,研究区内主力气层是山西组上部山1(S1)段,山西组下部可以作为接替层系。基于气藏主控因素研究,圈定了山西组各小层天然气富集区,其中Ⅱ类以上富集区面积可达498km2,占总面积31.58%,其中近期勘探开发有利区域叠合面积158km2,占全区面积的13.2%,其他区域可作为远期发展的接替区域。
[Abstract]:The Upper Paleozoic gas reservoir in Ordos Basin is characterized by "wide overlying" hydrocarbon generation, low permeability, compact, low pressure and lithologic gas reservoir formed in "large area". Under the background of "wide overlying" hydrocarbon generation, "large area" accumulation and extensive development of caprock in the whole Ordos Basin, reservoir development characteristics have become the key research contents of gas reservoir exploration. The study area is located in the eastern part of Yanchang gas field in the southeast of northern Shaanxi slope in Ordos Basin with an area of 1200 km2. The preliminary exploration study initially grasped the target strata of gas reservoir development, but under the condition of strong heterogeneity of gas reservoir, the understanding of effective reservoir distribution characteristics is not clear enough. In addition, the basic research work on reservoir log interpretation model, distribution characteristics of high efficiency reservoir, main control factors and enrichment law of natural gas enrichment and prediction standard of favorable exploration area are relatively weak. To some extent, it affects the follow-up high efficiency exploration and scale development of the gas field. In this paper, the reservoir of the Upper Paleozoic Permian Shanxi formation is taken as the research goal, and the previous research results such as basin evolution and sedimentary background are taken as the basis. The coupling relationship between gas reservoir distribution, reservoir development and gas reservoir pressure is established through basic geological research and gas reservoir characteristics study, and the main direction of development of gas reservoir is discussed. Through drilling, coring, analysis and testing, logging, logging and other data, the study of reservoir lithology, physical properties, pore structure, pore types, reservoir diagenesis, etc. Through the analysis of the basic geological conditions of natural gas reservoir formation, the comparative study of gas reservoir development characteristics and actual production data, the author has completed the research on the relationship between rock and electricity in the reservoir and established the log interpretation model of reservoir physical properties. The main controlling factors of natural gas accumulation in Shanxi formation of Upper Paleozoic in the study area are discussed. The prediction standard of favorable area for gas reservoir exploration and development is established, and the favorable target area and replacement area for subsequent exploration and development of gas field are predicted. To provide theoretical support and technical accumulation for gas field follow-up exploration research. Based on the study of trap types of gas reservoirs, it is found that the coupling relationship between gas reservoir distribution and reservoir distribution characteristics, reservoir physical properties plane distribution characteristics and gas reservoir pressure is studied. Reservoir thickness and porosity are the main controlling factors of rich and integrated reservoir. In the reservoir with porosity of more than 6%, the thickness of reservoir is proportional to the single well production of gas reservoir. Different from the whole gas field, the main gas formation in the study area is the upper part of Shanxi formation, and the lower part of Shanxi formation can be regarded as the replacement layer. Based on the study of the main control factors of the gas reservoir, the natural gas accumulation areas of each small layer of Shanxi formation are delineated. The area of class 鈪，

本文编号：2042505