鄂尔多斯盆地低渗透油藏勘探新技术
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摘要
鄂尔多斯盆地是一个大型中生代内陆坳陷型盆地,油气资源丰富。中生界延长组为一套内陆湖盆沉积,其形成的三角洲隐蔽性油藏主要受控于大型三角洲砂体的展布,油藏类型以岩性油藏为主,具有储集条件差、非均质程度高、油水关系复杂、隐蔽性强的特点。针对盆地油藏特点,长庆油田应用陆相三角洲成藏理论不断深化综合地质研究,优选有利勘探目标,同时积极应用地震储层预测、测井精细解释、压裂改造、油层保护等勘探技术,使鄂尔多斯盆地中生界低渗透油藏的勘探取得重大进展。近年来,在盆地陇东地区长6-长8低渗透油层勘探中,发现亿吨级整装西峰油田;在陕北三角洲油藏勘探中,含油范围不断扩大,探明石油地质储量大幅度增加,勘探成效显著。
Ordos basin is a large-scale Mesozoic inland depression-type basin with rich oil and gas resources. Yanchang Formation of Mesozoic is a set of inland lake basin sedimentation. The delta subtle oil reservoir formed on the basis of the sedimentation is mainly under the control of unfolding of a large-scale delta sandbody. The reservoir type is mainly the lithologic oil reservoir with poor reservoir conditions, high heterogeneous degree, complicated oil-water relations and strong subtle character. Based on such oil reservoir characteristics, Changqing Oilfield has adopted continental delta reservoir theories to strengthen the comprehensive geological study and select the favorable targets for exploration. Meanwhile, the oil field has made active application of such exploration techniques as seismic reservoir prediction, precise logging interpretation, fracturing renovation and oil reservoir protection to bring about major breakthroughs in exploration of Mesozoic low-permeability oil reservoirs in Ordos basin. In the recent years, exploration of the low-permeability Chang-6 to Chang-8 oil reservoirs in Longdong area of the basin has led to discovery of Xifeng Oil Field with 100 million tons of reserves while the oil-bearing scope is continuously expanding in exploration of the delta reservoir in the northern part of Shaanxi Province with the proven oil in place raised considerably, achieving remarkable performance in exploration.
Ordos basin is a large-scale Mesozoic inland depression-type basin with rich oil and gas resources. Yanchang Formation of Mesozoic is a set of inland lake basin sedimentation. The delta subtle oil reservoir formed on the basis of the sedimentation is mainly under the control of unfolding of a large-scale delta sandbody. The reservoir type is mainly the lithologic oil reservoir with poor reservoir conditions, high heterogeneous degree, complicated oil-water relations and strong subtle character. Based on such oil reservoir characteristics, Changqing Oilfield has adopted continental delta reservoir theories to strengthen the comprehensive geological study and select the favorable targets for exploration. Meanwhile, the oil field has made active application of such exploration techniques as seismic reservoir prediction, precise logging interpretation, fracturing renovation and oil reservoir protection to bring about major breakthroughs in exploration of Mesozoic low-permeability oil reservoirs in Ordos basin. In the recent years, exploration of the low-permeability Chang-6 to Chang-8 oil reservoirs in Longdong area of the basin has led to discovery of Xifeng Oil Field with 100 million tons of reserves while the oil-bearing scope is continuously expanding in exploration of the delta reservoir in the northern part of Shaanxi Province with the proven oil in place raised considerably, achieving remarkable performance in exploration.
引文
[1] ASC2002 Exploration and Production Research Workbench.Febr -uary, 2002, Allied Star Corp
[2] Gao jing - huai, Wu ru - shan, Wang bao - Jiang.A new type of analyzing wavelet best matching seismic wavelets and its applications for extraction of the instantaneous spectrum bandwidth, Expanded abstracts of the technical program.SEG 71th annual meeting, 2001
[3]俞寿朋.俞寿朋文集.北京:石油工业出版社,2001
[2] Gao jing - huai, Wu ru - shan, Wang bao - Jiang.A new type of analyzing wavelet best matching seismic wavelets and its applications for extraction of the instantaneous spectrum bandwidth, Expanded abstracts of the technical program.SEG 71th annual meeting, 2001
[3]俞寿朋.俞寿朋文集.北京:石油工业出版社,2001
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