鄂尔多斯盆地延长组长1油层组古地貌特征与油气富集规律——以陕北W地区为例

doi:10.11743/ogg20130506

摘要/Abstract

摘要：

揭示鄂尔多斯盆地延长组长1油层组油藏的油气富集规律对指导该盆地长1油层组的油气勘探具有重要意义。以陕北W地区为例,在地层划分对比的基础上,运用残余厚度法,并结合前人的区域古地貌研究成果,对研究区长1油层组顶部古地貌进行了恢复,同时分析了古地貌与长1油层组石油分布的关系。结合长1油层组的构造、沉积相、砂体厚度及封盖条件等控藏要素及与油气分布的关系,总结了研究区长1油层组油藏的富集规律。结果表明,研究区延长组长1油层组顶部发育有侵蚀沟谷、侵蚀斜坡和侵蚀残梁3种地貌单元,古地貌具有"一沟谷、两斜坡、两残梁"的特点,地形相对较高的残梁区对长1油层组石油分布具有重要控制作用。鼻状隆起构造脊、砂体较厚且砂地比较大的河道发育区也对长1油层组石油分布起着重要控制作用。另外,旋回性泥岩、致密砂岩层、侵蚀不整合面和水动力等多种封盖条件为长1油藏的形成起着重要遮挡作用。在上述控制因素作用下,形成以构造-岩性油藏和岩性油藏为主,岩性-水动力油藏为辅的多种油藏类型。鄂尔多斯盆地长1油层组的石油勘探重点应放在长1地形较高古地貌及沉积砂体发育的有利相带等的复合区域。

关键词: 古地貌, 油气富集, 油藏类型, 长1油层组, 鄂尔多斯盆地

Abstract:

Revealing the accumulation patterns of Chang 1 oil reservoir of the Yangchang Formation in Ordos Basin is very significant for oil and gas exploration in this area.Based on stratigraphic division and correlation,the paleogeomorphology of Chang 1 oil reservoir is restored by using residual thickness methods combined with previous research of regional paleogeomorphology.On this basis,its relationship with the distribution of hydrocarbons is analyzed.The patterns of hydrocarbon accumulation of this formation in this region are summarized through a comprehensive analysis of various controlling factors on hydrocarbon accumulation such as structures,sedimentary facies,sandstone thickness,sealing conditions,and so on.Three geomorphic units are recognized in Chang 1 oil reservoir,namely erosion valley,erosion slope and erosion monadnock.The paleogeomorphology features in "one valley,two slopes and two monadnocks".The erosion monadnocks in relatively higher terrain,the ridges of nose-like uplift,channel sands with larger thickness and higher net-to-gross ratio all have significant controlling effects on distribution of hydrocarbons of this formation.Moreover,cyclical mudstone,tight sandstone,erosion unconformity surfaces and hydrodynamic force all have large contributions to the sealing of the Chang 1 oil reservoir.Structural-lithologic reservoir and lithologic reservoir are the primary reservoir types,while lithologic-hydrodynamic reservoir is the secondary reservoir type.The overlapping regions of the main factors,such as the higher paleogeomorphology and the favorable sedimentary facies zones with larger sandstone thickness are the key exploration targets of this formation in Ordos Basin.

Key words: paleogeomorphology, hydrocarbon enrichment, reservoir type, Chang 1 oil reservior, Ordos Basin

中图分类号:

TE122.3

张凤奇,严小鳙,武富礼,等. 鄂尔多斯盆地延长组长1油层组古地貌特征与油气富集规律——以陕北W地区为例[J]. 石油与天然气地质, 2013, 34(5): 619-624. doi: 10.11743/ogg20130506 Zhang Fengqi,Yan Xiaoyong,Wu Fuli,et al. Paleogeomorphology characteristics and oil accumulation patterns of Chang 1 oil reservoir in the Yanchang Formation,Ordos Basin: a case study of W area in the northern of Shaanxi[J]. Oil & Gas Geology, 2013, 34(5): 619-624. doi: 10.11743/ogg20130506

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