【摘要】 鄂尔多斯盆地蕴含上、下古生界两套气藏,地质复杂程度高,非均质性强,大规模运用水平井开发的实践虽然形成了相关的配套开发技术,基本上实现了低渗透气藏的高效开发,但未来提升单井产能的技术攻关方向仍不明确。为此,将以苏里格气田为代表的上古生界气藏和以靖边气田为代表的下古生界气藏作为研究对象,对282口水平井从构造、沉积、储层、地震、钻井、改造等方面进行了整体研究。结果表明:长庆气区已形成的储层预测及精细描述技术等5项特色水平井技术系列是有效、实用的,但仍面临着3项急需攻克的瓶颈难题,可以从储层定量表征、小幅度构造识别及描述、水平井开发井网优化及提高采收率、水平井改造技术攻关、降低开发成本新策略等5个方面共17项技术措施入手进行攻关,以进一步降低低渗透气藏开发风险并提升单井产能。更多还原

【Abstract】 The Ordos Basin contains two kinds of gas reservoirs lying respectively in the Upper and Lower Paleozoic formations,and they are both featured by complex geological characteristics and great heterogeneity.Although there have been technical know-how to support the large-scale horizontal drillings for highly effective development of low-permeability gas reservoirs,the way of improving single well production remains unclear.In view of this,an overall study was made of the structures,depositions,reservoir strata,seismic features,drilling features and possible further EOR stimulation treatment of 282 wells located respectively on the Sulige Gas Field representing the Upper Paleozoic gas reservoirs and on the Jingbian Gas Field representing the Lower Paleozoic gas reservoirs.The result indicates that the 5 acquired techniques for horizontal wells on the Changqing Gas Field such as reservoir prediction and refined description are effectively viable,but there are still three technical difficulties remained unsettled,which,however,can be tackled for mitigating the risk in the development of low-permeability reservoirs and improving single well production by utilizing 17 techniques in the following aspects: reservoir quantitative characterization,identification and description of low-amplitude structure,measures of optimizing the pattern and enhancing the recovery rate of horizontal wells,horizontal well reconstructing techniques,and new strategies of cutting down development cost.更多还原