苏里格气田桃2区块马五段气、水分布规律及其主控因素

发布时间：2018-04-24 05:11

本文选题：鄂尔多斯盆地 + 苏里格气田　；参考：《西北大学》2017年硕士论文

【摘要】：苏里格气田桃2区块奥陶系马家沟组第五段储层主要为碳酸盐岩储层,具有孔隙度低、渗透率低的特点,储层非均质性极强,气藏连片性差,气、水分布规律复杂,生产过程中地层出水严重,气、水分布规律有待进一步研究。研究本区碳酸盐岩储层特征,结合天然气、地层水地化特征和分布特征,分析气、水分布规律及控制因素,对本区下古生界奥陶系储层进一步勘探开发具有重要意义。利用岩心观察、铸体薄片、扫描电镜、气、水相渗等资料,研究了桃2区块储层特征;根据天然气组分、地层水测试数据分析天然气和地层水的地化特征;利用试气和测井资料等,根据建立的气、水层综合识别方法判断储层含气性,研究气、水层的分布特征,探讨气、水层分布的控制因素。研究认为,储层的主要储集空间为各类溶蚀孔缝,各小层物性差别较大。正常地层水矿化度值主要集中在150～300g/L,沉积环境为海相环境,储层相邻地层中富含膏盐岩,导致现今地层水高矿化度。天然气中以CH4为主,属过成熟干气类型。通过交会图法和判别分析法有效识别气、水层,提高了气、水层识别的准确率,综合识别率达到80%以上。研究区东部含气程度较西部强,但气藏连片性差。构造起伏、古地貌、铝土岩展布和储层非均质性等因素是气、水分布的主要控制因素,分隔层呈条带状展布,是控制气、水分布的直接因素,表现为形成物性极差的分隔层,阻挡天然气运移。储层内发育的分隔层使其被划分为多个气水单元,在同一个气水单元中气层位于地层的上倾方向,并且在分隔层下方形成气藏,地层水多见于气水单元的下倾方向。
[Abstract]:The fifth member of Ordovician Majiagou formation in Sulige gas field is mainly carbonate reservoir, which has the characteristics of low porosity and low permeability, strong heterogeneity of reservoir, poor continuity of gas reservoir and complex distribution law of gas and water. In the process of production, the distribution of formation water is serious and the distribution of gas and water needs further study. It is of great significance for further exploration and development of Lower Paleozoic Ordovician reservoirs to study the characteristics of carbonate reservoir in this area, combined with the characteristics of natural gas, formation hydro-geochemical and distribution, and to analyze the distribution law of gas and water and the controlling factors. Based on core observation, thin section of cast body, scanning electron microscope, gas and water phase permeation, the reservoir characteristics of Tsao 2 block are studied, and the geochemical characteristics of natural gas and formation water are analyzed according to the test data of natural gas composition and formation water. Based on the gas test and logging data, the comprehensive identification method of gas and water layer is established to judge the gas bearing property of the reservoir, to study the distribution characteristics of the gas and water layers, and to discuss the controlling factors of the distribution of the gas and water layers. It is considered that the main reservoir space of the reservoir is all kinds of dissolution pore fractures, and the physical properties of each small layer vary greatly. The salinity of normal formation water is mainly concentrated at 150 ~ 300g / L, the sedimentary environment is marine environment, and the adjacent reservoir is rich in gypsum salt rock, which leads to the high salinity of formation water. Natural gas is dominated by CH4, which belongs to over mature dry gas type. The accuracy of gas and water layer recognition is improved by cross plot method and discriminant analysis method. The comprehensive recognition rate is more than 80%. The gas content in the east of the study area is stronger than that in the west, but the gas reservoir continuity is poor. Factors such as tectonic fluctuation, paleogeomorphology, bauxite distribution and reservoir heterogeneity are the main controlling factors of gas and water distribution. Block the flow of natural gas. In the same gas-water unit, the gas layer is located in the updip direction of the formation, and the gas reservoir is formed under the separated layer. The formation water is often found in the downdip direction of the gas-water unit.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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