Comprehensive evaluation of sealing ability of Tonggang fault in the Bachu uplift of the Tarim basin

Quan Yuke; Ding Wenlong; Yu Tengxiao; Huang Taizhu

doi:10.11743/ogg20080610

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Comprehensive evaluation of sealing ability of Tonggang fault in the Bachu uplift of the Tarim basin
Vol. 29, Issue 6, Pages: 769-773(2008)
Online First：24 December 2008，

Published：2008
DOI： 10.11743/ogg20080610
稿件说明：

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DOI：

Quan Yuke, Ding Wenlong, Yu Tengxiao, et al. Comprehensive evaluation of sealing ability of Tonggang fault in the Bachu uplift of the Tarim basin[J]. 2008, 29(6): 769-773. DOI： 10.11743/ogg20080610.

摘要

巴楚隆起西北部同岗断裂构造带发育了同岗断鼻和同岗南断背斜两个构造圈闭

但对圈闭的有效性尚存在疑虑

尤其是同岗断裂的封堵性直接影响着同岗构造圈闭的有效性。本文采用断裂两盘岩性的对置关系、断面图、泥岩涂抹系数、断层面压力计算等方法综合评价了同岗断裂的封闭性。结果表明:同岗断裂的侧向封闭性总体较差

垂向封闭性属于中等～较好

纵向上

断裂的深部(下奥陶统顶界以下地层)封闭性好于浅部;平面上

断裂南段好于北段

封闭性自南向北逐渐变差。

Abstract

Two structural traps (the Tonggang fault nose and the southern Tonggang faulted anticline) were developed in the Tonggang fault belt of the northwest Bachu uplift.The effectiveness of these traps

however

is still uncertain.The sealing ability of the Tongang fault has a direct effect on the effectiveness of the Tonggang structural traps.It is comprehensively evaluated through study of formation juxtaposition across

fault

surface mapping

shale smear factor

and calculation of pressure on fault surface.The following understandings are obtained. The lateral sealing ability is relatively low as a whole

while the vertical sealing ability is moderate to fair.Vertically

the seal is better in the deeper part (below the top of the Lower Ordovician) than that in the upper part; while laterally

it is better in the southern segment of the Tonggang fault than that in its northern segment.