摘要
基于地质背景和储集层特征分析,利用构造、沉积、成岩、古地貌及物性测试、压汞实验、测井、岩心观察等资料,从宏观和微观两个方面分析鄂尔多斯盆地西北部下古生界马家沟组五段碳酸盐岩气藏气、水分布特征及主控因素。研究区马五段气、水分布规律比较复杂,主要表现为:平面上气层全区均匀分布,水层则零散且小面积集中,呈现出不连续的分布特征;纵向上不存在气、水互层的现象,成为气藏高效合理开发的难点。气水分布宏观上主要受古地貌与成岩作用控制,微观上主要受储集层的孔喉结构、连通性及源储间输导关系控制,天然气多聚集在岩溶斜坡上的古沟槽周边和缓丘部位,这些地区储集层物性较好,孔喉连通性好,源储之间没有铝土岩隔挡,利于天然气充注成藏。
Based on the geologic background and reservoir characteristics, the characteristics and controlling factors of gas and water distribution of the carbonate reservoir in the 5th member of Ordovician Majiagou Formation in Northwest Ordos Basin have been examined from macro and micro aspects using data of structure, deposition, diagenesis, paleotopography, physical property, mercury injection, well logs and core observation. The 5th member of Majiagou Formation in the study area shows very complex gas and water distribution pattern： the gas layer is distributed uniformly across the whole area in 2D horizontal map, while the water layer is scattered and concentrates in small area, appearing in discontinuous distribution; there is no gas and water interbeds in vertical direction, making it difficult to develop the gas reservoir efficiently. The gas and water distribution is controlled by paleogeomorphology and diagenesis macroscopically, and is controlled by pore-throat structure, connectivity and the transportation relation between source rock and reservoir microscopically. The gas largely concentrates in and around the ancient grooves and low hill regions in the paleokast slope where the reservoirs have good physical properties and good pore- throat connectivity, and there is no bauxite between source rock and reservoir, making it easy for gas to charge and accumulate.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2016年第3期396-402,共7页
Petroleum Exploration and Development
基金
陕西省教育厅专项基金(14JK1740)
西北大学大陆动力学国家重点实验室自主研究课题基金(BJ08133-4)
国家自然科学基金项目(41172122)
关键词
碳酸盐岩气藏
气水分布
古地貌
成岩作用
孔隙结构
输导关系
鄂尔多斯盆地
奥陶系马家沟组
carbonate gas reservoir
gas and water distribution
paleogeomorphology
diagenesis
pore structure
transportation relation
Ordos Basin
Ordovician Majiagou Formation
作者简介
于红岩（1986-），女，黑龙江哈尔滨人，博士，西北大学地质学系讲师，从事测井地质学研究。地址：陕西省西安市碑林区太白北路229号，西北大学地质学系，邮政编码：710069。E-mail：yuhy@nwu．edu．cn
