砂质碎屑流概念及其在鄂尔多斯盆地延长组深水沉积研究中的应用

doi:10.11867/j.issn.1001-8166.2011.03.0286

砂质碎屑流是近年来日益受到重视的一种新的砂体成因类型，其相关理论是对“鲍玛序列”和“浊积扇”等深水沉积理论的部分否定和完善。阐述了砂质碎屑流概念精华与存在问题，指出只有进一步结合我国陆相盆地沉积不断完善该理论,才能提高勘探成功率，从而促进我国石油工业的发展。同时运用砂质碎屑概念，将鄂尔多斯盆地湖盆中心深水区延长组长6段沉积划分为砂质碎屑流、经典浊积岩和滑塌岩3种沉积物重力流及牵引底流等。研究认为砂质碎屑流在该地区最为发育，其空间分布主要受深水坡折带控制，且陡坡与缓坡分布模式明显不同，前者大致平行于坡折带分布，后者垂直于坡折带分布。最后指出，由于砂质碎屑流分布面积广，厚度大，成藏条件优越，是鄂尔多斯盆地今后最为有利的勘探新领域之一。

关键词: 砂质碎屑流, 理论精华, 问题缺陷, 深水沉积, 延长组, 鄂尔多斯盆地

Sandy debris flow is a new sandy type and attracts more and more attention in recent years. Its relative theory is partial negation and improvement of deepwater sediments concepts like the "Bouma Sequence" and "turbidite fan". This paper describes the essence of the concept of sandy debris flow and existing problems, and points out that only by combining the features of continental sedimentary basins in China to improve the theory can the success rate of exploration be improved, thereby promoting the development of China's oil industry. This paper also used the concept of sandy debris flow. The sedimentation of Chang 6 is divided into sandy debris flow, classic turbidite and slump, the three kinds of sediment gravity flows and traction underflow in the deep water area of the lake center in Ordos Basin. Studies suggest that sandy debris flow most develops in the region, and its spatial distribution is mainly controlled by the deepwater slope breaks. Steep and gentle slope significantly have different distribution patterns; the former generally parallels to the slope break distribution, and the latter distribution is perpendicular to the slope break. Finally, the paper points out that because of the wide area of distribution, large thickness and good hydrocarbon accumulation conditions, sandy debris flow is one of the most advantageous and new exploration areas in the future in Ordos Basin.

Key words: Sandy debris flow, Theory of essence, Problems defects, Deep water sedimentation, Yanchang formation, Ordos Basin.

中图分类号:

P588.21
P536

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[1]	钟广法,李前裕,郝沪军,王嘹亮. 深水沉积物波及其在南海研究之现状[J]. 地球科学进展, 2007, 22(9): 907-913.

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The Concept of Sandy Debris Flow and Its Application in the Yanchang Formation Deep Water Sedimentation of the Ordos Basin