新疆库车坳陷克拉苏冲断带白垩系辫状河三角洲沉积特征及其与储集层发育的关系*

doi:10.7605/gdlxb.2013.05.058

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Abstract The Member 1 and Member 2 of Bashijiqike Formation mainly comprised a set of terrigenous clastic rocks including fine sandstone, moderate-coarse sandstone, pebbled sandstone, siltstone and mudstone of Kelasu tectonic zone in Kuqa Depression, Xinjiang. Based on the analysis of data of well logging, thin section, grain size and core observation of over 30 wells(include 6 new cored wells), together with data of regional geology,|it was confirmed that there existed typical deposits of braided delta in the Bashijiqike Formation in Kelasu tectonic zone. The braided delta was characterized by composition of lithic sandstones, sedimentary structures such as wedge-shaped cross bedding and scour-and-fill tectonic formed by strong hydropower and several non-continuous normal cycles vertically, large sandbodies extended far towards the central basin, high sand-shale ratio, and the main microfacies were braided subaqueous distributary channel and subaqueous inter-distributary channel and mouth bar. According to lithologic characteristics, sedimentary structures and sedimentary sequence of the braided delta, a depositional model for the braided delta was established. The large delta front was well developed in the study area under the stable tectonic backgrounds with open basin and rich sediment supply. Subaqueous distributary channel deposits were well developed with the best physical property, and sand bodies extended towards the center of the basin for 35～60 km with good vertical and horizontal connection, so that it could be favorable reservoir space for lithologic reservoirs.

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	Articles by authors
	Pan Rong
	Zhu Xiaomin
	Liu Fen
	Li Yong
	Ma Yujie
	Di Hongli
	Zhang Ronghu

Key words： Kuqa Depression Bashijiqike Formation braided delta sedimentary characteristics depositional model reservoir

Received: 03 April 2013 Published: 01 October 2013

ZTFLH:	P512.2
	TE122.2＋1

Corresponding Authors: Zhu Xiaomin, born in 1960, is a professor and Ph. D. supervisor in China University of Petoleum(Beijing), and is mainly engaged in sedimentology and sequence stratigraphy. E-mail: xmzhu@cup.edu.cn.

About author: Pan Rong, born in 1985, is a Ph. D. candidate in China University of Petroleum(Beijing), and is mainly engaged in study of sedimentology and petroleum geology. E-mail: rongfenxiang@163.com. 

Cite this article:

Pan Rong,Zhu Xiaomin,Liu Fen et al. Sedimentary characteristics of braided delta and relationship to reservoirs in the Cretaceous of Kelasu tectonic zone in Kuqa Depression, Xinjiang[J]. JOPC, 2013, 15(5): 707-716.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2013.05.058 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2013/V15/I5/707

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