准噶尔盆地夏红北断裂带结构及其封闭差异性评价

doi:10.11743/ogg20150605

摘要/Abstract

摘要： 断裂不仅是一个面，有时能形成具有复杂结构的体，可划分为多个单元，不同结构单元封闭机理不同，评价方法也应存在差异。在大量岩心观察基础上，结合地震资料解释，将准噶尔盆地西北缘夏红北断裂在平面上划分为东、西两段，剖面上划分为滑动破碎带与诱导裂缝带两个结构单元。滑动破碎带受挤压、扭动、研磨强烈，岩石碎裂化、岩粉化严重，故采用断面应力、涂抹作用、充填作用定量评价其封闭性；诱导裂缝带岩石破碎较弱，裂缝发育，致密性差，孔渗性好，易受后期流体作用，故利用薄片与扫描电镜分析技术，采用成岩胶结作用或原油稠化作用评价其封闭性。结果表明：夏红北断裂滑动破碎带封闭性西段好于东段；诱导裂缝带西段为矿物胶结封闭，而东段为原油稠化充填，封闭较晚。镜下鉴定及流体包裹体测试分析表明：夏红北断裂至少发生3期大规模的流体活动，其中第一期为地层水活动，第二期、第三期流体活动伴随油气运移作用。故断裂带的封闭性是多期流体作用的结果。

关键词: 滑动破碎带, 诱导裂缝带, 断层封闭性, 夏红北断裂, 准噶尔盆地

Abstract: A fault is not only a planar surface,but a 3D geologic body with complex internal structures some time,which can be divided into several units.Each unit has a different sealing mechanism,thus should be evaluated with different methods.Through integration of core observation with seismic interpretation,the Xiahong North Fault is divided into two segments,an east and a west segment,in plain view,two units,a slip fractured zone and a induced fracture zone,in sectional view.The slip fractured zone experienced strong compression,twisting and abration,resulting in strong cataclasis,thus can be quantitatively evaluated by the indices of ‘Fault Surface Stress',‘Shale Gouge Ratio' and ‘Fault Zone Filling'.The induced fracture zone experienced relatively weak cataclasis and had highly-developed fractures,better poroperm properties,thus can be analyzed according to diagenetic cementation and oil thickening by using thin section and SEM technologies.For the slip fractured zone of Xiahong North Fault,the west segment presents better sealing properties than the east segment,while for the fractured zone,the west segment is sealed by cementation and the east segment is filled by thickened oil.The SEM and fluid inclusion analyses suggest that there are at least three periods of fluid migration affecting the properties of the Xiahong North Fault,of which the 1^st fluid migration is dominated by formation water and the 2^nd-3^rd fluid migration is accompanied by hydrocarbon migration.Therefore,the sealing properties of the Xiahong North Fault zone are the result of the multiple fluid activities in geologic history.

Key words: slip fractured zone, induced frature zone, fault sealing capacity, Xiahong North Fault, Junggar Basin

中图分类号:

TE121.2

吴孔友,李思远,裴仰文,等. 准噶尔盆地夏红北断裂带结构及其封闭差异性评价[J]. 石油与天然气地质, 2015, 36(6): 906-912. doi: 10.11743/ogg20150605 Wu Kongyou,Li Siyuan,Pei Yangwen,et al. Fault zone architecture of Xiahong North Fault zone in Junggar Basin and its sealing properties[J]. Oil & Gas Geology, 2015, 36(6): 906-912. doi: 10.11743/ogg20150605

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