四川盆地大川中地区深层断裂发育特征及其地质意义

doi:10.11743/ogg20130314

摘要/Abstract

摘要： 应用地震综合解释技术,对四川盆地大川中地区21 000 km二维地震和近3 000 km²三维地震进行深层断裂体系的系统解译研究。研究表明,深层断裂具有以下3个特征:(1)控制沉积盖层构造变形;(2)纵向上规模大,下部断入基底,上部断入飞仙关组,同时伴有花状断裂产生;(3)深、浅层断裂特征明显不同,深层断裂角度陡,以走滑断裂为主,浅层断裂角度相对较缓,以逆断层为主。在大川中地区共解释断裂172条,断裂平面延伸长度3~79 km不等。深层断裂平面展布具有明显的分区和分带性,威远—资阳—遂宁—大足一带,以北东向和近东西向为主;巴中—仪陇—广安一带,以北西向和近东西向为主;平昌—达州一带,以近南北向为主。深层断裂对该区沉积相带和有利沉积体的分布有控制作用,可以沟通低孔隙和致密储层,有效改善储层物性,提高油气产能。深层断裂可以控制局部构造圈闭的形成;同时可以作为油气运移的通道,有效沟通烃源岩和储集层,控制异源型烃源体系的油气成藏。

关键词: 地震综合解释技术, 深层断裂, 大川中地区, 四川盆地

Abstract: To research the deep-rooted fault system in Dachuanzhong area of Sichuan Basin,2D seismic data of 21 000 km and 3D seismic data of 3 000 km² were interpreted applying the integrated seismic interpretation technique.Three characteristics of the deep-rooted faults were revealed.The deep-rooted faults control the tectonic deformation of the seals.They cut downward into the basement and upward into the Feixianguan Formation and are associated with flower-shaped faults.The deep faults and the shallow ones have distinct characteristics,with the former being high in angle and dominated by strike-slip faults while the latter being relatively low in angle and dominated by reverse faults.A total of 172 faults were interpreted in Dachuanzhong area and their lateral extensions range from 3 to 79 km.The areal distribution of deep faults shows distinct zonation.The first zone is Weiyuan-Ziyang-Suining-Dazu area where the faults are NE-trending or nearly EW-trending.The second is Bazhong-Yilong-Guang'an area where the faults are NW-trending or nearly EW-trending.The third is Pingchang-Dazhou area where the faults are SN-trending.The deep faults control the sedimentary faces belts and the distribution of favorable sedimentary body,communicate the low porosity and tight reservoirs,effectively improve the reservoir properties and increase oil and gas production capacity.They also control the formation of local structural traps and can act as effective migration pathways for hydrocarbons from source rocks to reservoirs and control hydrocarbon accumulation of allogenic source systems.

Key words: integrated seismic interpretation technique, deep fault, Dachuanzhong area, Sichuan Basin

中图分类号:

TE121.1

殷积峰,谷志东,李秋芬. 四川盆地大川中地区深层断裂发育特征及其地质意义[J]. 石油与天然气地质, 2013, 34(3): 376-382. doi: 10.11743/ogg20130314 Yin Jifeng,Gu Zhidong,Li Qiufen. Characteristics of deep-rooted faults and their geological significances in Dachuanzhong area,Sichuan Basin[J]. Oil & Gas Geology, 2013, 34(3): 376-382. doi: 10.11743/ogg20130314

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