The Formation and Evolution of Weathering Reservoir of Ordovician Paleocrust in Tahe Oilfield, Tarim Basin

Abstract

Abstract:

The weathering reservoir of Ordovician paleocrust in Tahe oilfield undergoes weathering and denudation as long as 118 Ma from Middle Caledonia to Hercynian period. Cores observations and well logs explanations show that cave development in vertical is closely related to multistage tectonic movements of Northern Tianshan. The chaotic network of cave system were formed from multiphase superpositions of various dissolution such as direct runoff, vadose dissolution, underflow, mixed-water dissolution of coastal zone during 8 times uplift movements in the MidLate Caledonia and Early Hercynian movements.

Key words: Tahe oilfield, Ordovician, paleocrust of weathering, reservoir, dissolution, chaotic network of cave system

CLC Number:

TE122.2

Jia Zhen-Yuan, CA Zhong-Xian, XU Wei. The Formation and Evolution of Weathering Reservoir of Ordovician Paleocrust in Tahe Oilfield, Tarim Basin[J]. Geoscience, 2010, 24(6): 1057-1064.

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