鄂尔多斯盆地延长期原型湖盆恢复及中部砂体成因
网络出版日期: 2012-08-20
基金资助
国家科技重大专项“鄂尔多斯盆地大型低渗透地层油气藏开发示范工程”(编号:2011ZX05044)资助
Reconstitution of original lake basin during Triassic Yanchang stage and sand body genesis in the center of Ordos Basin
Online published: 2012-08-20
根据大量钻井、露头及岩心资料,采用野外观察与室内研究相结合的方法,对鄂尔多斯盆地延长期 湖岸线、深湖线、湖盆底形等进行了恢复,所恢复的长6 湖盆中心位于正宁、甘泉、庙湾等地。东北部缓坡 带主要发育三角洲砂体,西南部陡坡带主要发育辫状河三角洲及深湖区重力流(主要为浊积岩和砂质碎 屑流)砂体;湖盆东北部发育浅水坡折带和深水缓坡型坡折带,西南部发育深水陡坡型坡折带,湖盆中心 具有先向西南方向迁移,再向东北方向迁移的演化特点。在对三角洲砂体的勘探继续关注的同时,深水区 及湖泛期砂体的勘探也应引起进一步的重视;受东部缓坡坡折带控制的地区和受西部陡坡坡折带控制的 地区砂体的展布规律不同,应采取不同的勘探思路。
汪旭东 , 查明 , 曲江秀 , 高长海 , 陈中红 , 张守春 . 鄂尔多斯盆地延长期原型湖盆恢复及中部砂体成因[J]. 岩性油气藏, 2012 , 24(4) : 56 -63 . DOI: 10.3969/j.issn.1673-8926.2012.04.011
Based on large quantities of drilling, outcrop and core data, combined with field observation and laboratory study, the lake shoreline, deep lake line and the lake basin bed formwere restored. The result shows that the lake basin center of Chang 6 period is located at Zhengning, Ganquan and Miaowan area. Delta sand bodies are developed in northeast gentle slope break zone, braided delta and gravity flow (mainly turbidite and sandy debris flow) in deep lake are developed in southwest steep slope break zone, shallowwater slope break zone and deep water gentle slope break zone are mainly developed in the northeast, and deep water steep slope break zone is mainly developed in the southwest of the lake basin, with the center migrating to the southwest and then to northeast. Therefore, delta sand body is still the
target of exploration in the future. Meanwhile, the exploration of sand body formed in deep lake and during flooding should be enhanced. The sand body distribution rule in the east gentle slope break zone is different to that in the west steep slope break zone, sowe should adopt a different exploration strategy for different areas.
Key words: overpressure seal; mudstone; diagenesis; sealing ability; Dongying Depression
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